Release 4.11 fs/exec.c

/*
 *  linux/fs/exec.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/*
 * #!-checking implemented by tytso.
 */
/*
 * Demand-loading implemented 01.12.91 - no need to read anything but
 * the header into memory. The inode of the executable is put into
 * "current->executable", and page faults do the actual loading. Clean.
 *
 * Once more I can proudly say that linux stood up to being changed: it
 * was less than 2 hours work to get demand-loading completely implemented.
 *
 * Demand loading changed July 1993 by Eric Youngdale.   Use mmap instead,
 * current->executable is only used by the procfs.  This allows a dispatch
 * table to check for several different types  of binary formats.  We keep
 * trying until we recognize the file or we run out of supported binary
 * formats.
 */

#include <linux/slab.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/mm.h>
#include <linux/vmacache.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/swap.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/sched/mm.h>
#include <linux/sched/coredump.h>
#include <linux/sched/signal.h>
#include <linux/sched/numa_balancing.h>
#include <linux/sched/task.h>
#include <linux/pagemap.h>
#include <linux/perf_event.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/key.h>
#include <linux/personality.h>
#include <linux/binfmts.h>
#include <linux/utsname.h>
#include <linux/pid_namespace.h>
#include <linux/module.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/tsacct_kern.h>
#include <linux/cn_proc.h>
#include <linux/audit.h>
#include <linux/tracehook.h>
#include <linux/kmod.h>
#include <linux/fsnotify.h>
#include <linux/fs_struct.h>
#include <linux/pipe_fs_i.h>
#include <linux/oom.h>
#include <linux/compat.h>
#include <linux/vmalloc.h>

#include <linux/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>

#include <trace/events/task.h>
#include "internal.h"

#include <trace/events/sched.h>


int suid_dumpable = 0;

static LIST_HEAD(formats);
static DEFINE_RWLOCK(binfmt_lock);



void __register_binfmt(struct linux_binfmt * fmt, int insert)
{
	BUG_ON(!fmt);
	if (WARN_ON(!fmt->load_binary))
		return;
	write_lock(&binfmt_lock);
	insert ? list_add(&fmt->lh, &formats) :
		 list_add_tail(&fmt->lh, &formats);
	write_unlock(&binfmt_lock);
}

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Linus Torvalds (pre-git)
28
42.42%
4
50.00%
Ivan Kokshaysky
17
25.76%
1
12.50%
Oleg Nesterov
11
16.67%
1
12.50%
Alexey Dobriyan
5
7.58%
1
12.50%
Al Viro
5
7.58%
1
12.50%
Total
66
100.00%
8
100.00%


EXPORT_SYMBOL(__register_binfmt);



void unregister_binfmt(struct linux_binfmt * fmt)
{
	write_lock(&binfmt_lock);
	list_del(&fmt->lh);
	write_unlock(&binfmt_lock);
}

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Linus Torvalds (pre-git)
25
83.33%
3
60.00%
Alexey Dobriyan
5
16.67%
2
40.00%
Total
30
100.00%
5
100.00%


EXPORT_SYMBOL(unregister_binfmt);



static inline void put_binfmt(struct linux_binfmt * fmt)
{
	module_put(fmt->module);
}

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Linus Torvalds (pre-git)
18
94.74%
1
50.00%
Christoph Hellwig
1
5.26%
1
50.00%
Total
19
100.00%
2
100.00%



bool path_noexec(const struct path *path)
{
	return (path->mnt->mnt_flags & MNT_NOEXEC) ||
	       (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC);
}

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Eric W. Biedermann
34
100.00%
1
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34
100.00%
1
100.00%

#ifdef CONFIG_USELIB
/*
 * Note that a shared library must be both readable and executable due to
 * security reasons.
 *
 * Also note that we take the address to load from from the file itself.
 */

SYSCALL_DEFINE1(uselib, const char __user *, library)
{
	struct linux_binfmt *fmt;
	struct file *file;
	struct filename *tmp = getname(library);
	int error = PTR_ERR(tmp);
	static const struct open_flags uselib_flags = {
		.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
		.acc_mode = MAY_READ | MAY_EXEC,
		.intent = LOOKUP_OPEN,
		.lookup_flags = LOOKUP_FOLLOW,
        };

	if (IS_ERR(tmp))
		goto out;

	file = do_filp_open(AT_FDCWD, tmp, &uselib_flags);
	putname(tmp);
	error = PTR_ERR(file);
	if (IS_ERR(file))
		goto out;

	error = -EINVAL;
	if (!S_ISREG(file_inode(file)->i_mode))
		goto exit;

	error = -EACCES;
	if (path_noexec(&file->f_path))
		goto exit;

	fsnotify_open(file);

	error = -ENOEXEC;

	read_lock(&binfmt_lock);
	list_for_each_entry(fmt, &formats, lh) {
		if (!fmt->load_shlib)
			continue;
		if (!try_module_get(fmt->module))
			continue;
		read_unlock(&binfmt_lock);
		error = fmt->load_shlib(file);
		read_lock(&binfmt_lock);
		put_binfmt(fmt);
		if (error != -ENOEXEC)
			break;
	}
	read_unlock(&binfmt_lock);
exit:
	fput(file);
out:
  	return error;
}
#endif /* #ifdef CONFIG_USELIB */

#ifdef CONFIG_MMU
/*
 * The nascent bprm->mm is not visible until exec_mmap() but it can
 * use a lot of memory, account these pages in current->mm temporary
 * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we
 * change the counter back via acct_arg_size(0).
 */


static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
{
	struct mm_struct *mm = current->mm;
	long diff = (long)(pages - bprm->vma_pages);

	if (!mm || !diff)
		return;

	bprm->vma_pages = pages;
	add_mm_counter(mm, MM_ANONPAGES, diff);
}

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Oleg Nesterov
62
100.00%
2
100.00%
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62
100.00%
2
100.00%



static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
		int write)
{
	struct page *page;
	int ret;
	unsigned int gup_flags = FOLL_FORCE;

#ifdef CONFIG_STACK_GROWSUP
	if (write) {
		ret = expand_downwards(bprm->vma, pos);
		if (ret < 0)
			return NULL;
	}
#endif

	if (write)
		gup_flags |= FOLL_WRITE;

	/*
         * We are doing an exec().  'current' is the process
         * doing the exec and bprm->mm is the new process's mm.
         */
	ret = get_user_pages_remote(current, bprm->mm, pos, 1, gup_flags,
			&page, NULL, NULL);
	if (ret <= 0)
		return NULL;

	if (write) {
		unsigned long size = bprm->vma->vm_end - bprm->vma->vm_start;
		struct rlimit *rlim;

		acct_arg_size(bprm, size / PAGE_SIZE);

		/*
                 * We've historically supported up to 32 pages (ARG_MAX)
                 * of argument strings even with small stacks
                 */
		if (size <= ARG_MAX)
			return page;

		/*
                 * Limit to 1/4-th the stack size for the argv+env strings.
                 * This ensures that:
                 *  - the remaining binfmt code will not run out of stack space,
                 *  - the program will have a reasonable amount of stack left
                 *    to work from.
                 */
		rlim = current->signal->rlim;
		if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur) / 4) {
			put_page(page);
			return NULL;
		}
	}

	return page;
}

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Ollie Wild
101
52.88%
1
6.67%
Linus Torvalds (pre-git)
32
16.75%
5
33.33%
Linus Torvalds
25
13.09%
2
13.33%
Lorenzo Stoakes
17
8.90%
2
13.33%
Oleg Nesterov
10
5.24%
2
13.33%
Jiri Slaby
3
1.57%
1
6.67%
Dave Hansen
2
1.05%
1
6.67%
Michal Hocko
1
0.52%
1
6.67%
Total
191
100.00%
15
100.00%



static void put_arg_page(struct page *page)
{
	put_page(page);
}

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Ollie Wild
13
81.25%
1
33.33%
Linus Torvalds (pre-git)
2
12.50%
1
33.33%
Adrian Bunk
1
6.25%
1
33.33%
Total
16
100.00%
3
100.00%



static void free_arg_pages(struct linux_binprm *bprm)
{
}

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Ollie Wild
5
50.00%
1
33.33%
Linus Torvalds (pre-git)
5
50.00%
2
66.67%
Total
10
100.00%
3
100.00%



static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos,
		struct page *page)
{
	flush_cache_page(bprm->vma, pos, page_to_pfn(page));
}

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Ollie Wild
31
91.18%
1
50.00%
Andrew Morton
3
8.82%
1
50.00%
Total
34
100.00%
2
100.00%



static int __bprm_mm_init(struct linux_binprm *bprm)
{
	int err;
	struct vm_area_struct *vma = NULL;
	struct mm_struct *mm = bprm->mm;

	bprm->vma = vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
	if (!vma)
		return -ENOMEM;

	if (down_write_killable(&mm->mmap_sem)) {
		err = -EINTR;
		goto err_free;
	}
	vma->vm_mm = mm;

	/*
         * Place the stack at the largest stack address the architecture
         * supports. Later, we'll move this to an appropriate place. We don't
         * use STACK_TOP because that can depend on attributes which aren't
         * configured yet.
         */
	BUILD_BUG_ON(VM_STACK_FLAGS & VM_STACK_INCOMPLETE_SETUP);
	vma->vm_end = STACK_TOP_MAX;
	vma->vm_start = vma->vm_end - PAGE_SIZE;
	vma->vm_flags = VM_SOFTDIRTY | VM_STACK_FLAGS | VM_STACK_INCOMPLETE_SETUP;
	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
	INIT_LIST_HEAD(&vma->anon_vma_chain);

	err = insert_vm_struct(mm, vma);
	if (err)
		goto err;

	mm->stack_vm = mm->total_vm = 1;
	arch_bprm_mm_init(mm, vma);
	up_write(&mm->mmap_sem);
	bprm->p = vma->vm_end - sizeof(void *);
	return 0;
err:
	up_write(&mm->mmap_sem);
err_free:
	bprm->vma = NULL;
	kmem_cache_free(vm_area_cachep, vma);
	return err;
}

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Ollie Wild
156
71.89%
1
10.00%
Michal Hocko
16
7.37%
2
20.00%
Luiz Fernando N. Capitulino
12
5.53%
1
10.00%
Rik Van Riel
8
3.69%
1
10.00%
Mel Gorman
8
3.69%
1
10.00%
Dave Hansen
7
3.23%
1
10.00%
Andrew Morton
5
2.30%
1
10.00%
Coly Li
3
1.38%
1
10.00%
Cyrill V. Gorcunov
2
0.92%
1
10.00%
Total
217
100.00%
10
100.00%



static bool valid_arg_len(struct linux_binprm *bprm, long len)
{
	return len <= MAX_ARG_STRLEN;
}

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Ollie Wild
19
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1
100.00%
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19
100.00%
1
100.00%

#else



static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
{
}

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Oleg Nesterov
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%



static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
		int write)
{
	struct page *page;

	page = bprm->page[pos / PAGE_SIZE];
	if (!page && write) {
		page = alloc_page(GFP_HIGHUSER|__GFP_ZERO);
		if (!page)
			return NULL;
		bprm->page[pos / PAGE_SIZE] = page;
	}

	return page;
}

Contributors
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CommitProp
Ollie Wild
75
98.68%
1
50.00%
Oleg Nesterov
1
1.32%
1
50.00%
Total
76
100.00%
2
100.00%



static void put_arg_page(struct page *page)
{
}

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Ollie Wild
10
100.00%
1
100.00%
Total
10
100.00%
1
100.00%



static void free_arg_page(struct linux_binprm *bprm, int i)
{
	if (bprm->page[i]) {
		__free_page(bprm->page[i]);
		bprm->page[i] = NULL;
	}
}

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Ollie Wild
44
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1
100.00%
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44
100.00%
1
100.00%



static void free_arg_pages(struct linux_binprm *bprm)
{
	int i;

	for (i = 0; i < MAX_ARG_PAGES; i++)
		free_arg_page(bprm, i);
}

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Ollie Wild
34
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1
100.00%
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34
100.00%
1
100.00%



static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos,
		struct page *page)
{
}

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Ollie Wild
19
100.00%
1
100.00%
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19
100.00%
1
100.00%



static int __bprm_mm_init(struct linux_binprm *bprm)
{
	bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *);
	return 0;
}

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Ollie Wild
28
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1
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28
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1
100.00%



static bool valid_arg_len(struct linux_binprm *bprm, long len)
{
	return len <= bprm->p;
}

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21
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1
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21
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1
100.00%

#endif /* CONFIG_MMU */

/*
 * Create a new mm_struct and populate it with a temporary stack
 * vm_area_struct.  We don't have enough context at this point to set the stack
 * flags, permissions, and offset, so we use temporary values.  We'll update
 * them later in setup_arg_pages().
 */


static int bprm_mm_init(struct linux_binprm *bprm)
{
	int err;
	struct mm_struct *mm = NULL;

	bprm->mm = mm = mm_alloc();
	err = -ENOMEM;
	if (!mm)
		goto err;

	err = __bprm_mm_init(bprm);
	if (err)
		goto err;

	return 0;

err:
	if (mm) {
		bprm->mm = NULL;
		mmdrop(mm);
	}

	return err;
}

Contributors
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Ollie Wild
81
98.78%
1
50.00%
Yuanhan Liu
1
1.22%
1
50.00%
Total
82
100.00%
2
100.00%


struct user_arg_ptr {
#ifdef CONFIG_COMPAT
	
bool is_compat;
#endif
	union {
		
const char __user *const __user *native;
#ifdef CONFIG_COMPAT
		
const compat_uptr_t __user *compat;
#endif
	} 
ptr;
};



static const char __user *get_user_arg_ptr(struct user_arg_ptr argv, int nr)
{
	const char __user *native;

#ifdef CONFIG_COMPAT
	if (unlikely(argv.is_compat)) {
		compat_uptr_t compat;

		if (get_user(compat, argv.ptr.compat + nr))
			return ERR_PTR(-EFAULT);

		return compat_ptr(compat);
	}
#endif

	if (get_user(native, argv.ptr.native + nr))
		return ERR_PTR(-EFAULT);

	return native;
}

Contributors
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Oleg Nesterov
86
91.49%
3
60.00%
Ollie Wild
6
6.38%
1
20.00%
David Howells
2
2.13%
1
20.00%
Total
94
100.00%
5
100.00%

/*
 * count() counts the number of strings in array ARGV.
 */


static int count(struct user_arg_ptr argv, int max)
{
	int i = 0;

	if (argv.ptr.native != NULL) {
		for (;;) {
			const char __user *p = get_user_arg_ptr(argv, i);

			if (!p)
				break;

			if (IS_ERR(p))
				return -EFAULT;

			if (i >= max)
				return -E2BIG;
			++i;

			if (fatal_signal_pending(current))
				return -ERESTARTNOHAND;
			cond_resched();
		}
	}
	return i;
}

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Ollie Wild
61
62.89%
1
12.50%
Oleg Nesterov
20
20.62%
3
37.50%
Roland McGrath
11
11.34%
1
12.50%
Xi Wang
3
3.09%
1
12.50%
Jason Baron
1
1.03%
1
12.50%
David Howells
1
1.03%
1
12.50%
Total
97
100.00%
8
100.00%

/*
 * 'copy_strings()' copies argument/environment strings from the old
 * processes's memory to the new process's stack.  The call to get_user_pages()
 * ensures the destination page is created and not swapped out.
 */


static int copy_strings(int argc, struct user_arg_ptr argv,
			struct linux_binprm *bprm)
{
	struct page *kmapped_page = NULL;
	char *kaddr = NULL;
	unsigned long kpos = 0;
	int ret;

	while (argc-- > 0) {
		const char __user *str;
		int len;
		unsigned long pos;

		ret = -EFAULT;
		str = get_user_arg_ptr(argv, argc);
		if (IS_ERR(str))
			goto out;

		len = strnlen_user(str, MAX_ARG_STRLEN);
		if (!len)
			goto out;

		ret = -E2BIG;
		if (!valid_arg_len(bprm, len))
			goto out;

		/* We're going to work our way backwords. */
		pos = bprm->p;
		str += len;
		bprm->p -= len;

		while (len > 0) {
			int offset, bytes_to_copy;

			if (fatal_signal_pending(current)) {
				ret = -ERESTARTNOHAND;
				goto out;
			}
			cond_resched();

			offset = pos % PAGE_SIZE;
			if (offset == 0)
				offset = PAGE_SIZE;

			bytes_to_copy = offset;
			if (bytes_to_copy > len)
				bytes_to_copy = len;

			offset -= bytes_to_copy;
			pos -= bytes_to_copy;
			str -= bytes_to_copy;
			len -= bytes_to_copy;

			if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
				struct page *page;

				page = get_arg_page(bprm, pos, 1);
				if (!page) {
					ret = -E2BIG;
					goto out;
				}

				if (kmapped_page) {
					flush_kernel_dcache_page(kmapped_page);
					kunmap(kmapped_page);
					put_arg_page(kmapped_page);
				}
				kmapped_page = page;
				kaddr = kmap(kmapped_page);
				kpos = pos & PAGE_MASK;
				flush_arg_page(bprm, kpos, kmapped_page);
			}
			if (copy_from_user(kaddr+offset, str, bytes_to_copy)) {
				ret = -EFAULT;
				goto out;
			}
		}
	}
	ret = 0;
out:
	if (kmapped_page) {
		flush_kernel_dcache_page(kmapped_page);
		kunmap(kmapped_page);
		put_arg_page(kmapped_page);
	}
	return ret;
}

Contributors
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Ollie Wild
136
37.47%
1
5.26%
Linus Torvalds (pre-git)
119
32.78%
11
57.89%
Andrew Morton
56
15.43%
1
5.26%
Oleg Nesterov
30
8.26%
2
10.53%
Roland McGrath
20
5.51%
2
10.53%
David Howells
1
0.28%
1
5.26%
Linus Torvalds
1
0.28%
1
5.26%
Total
363
100.00%
19
100.00%

/*
 * Like copy_strings, but get argv and its values from kernel memory.
 */


int copy_strings_kernel(int argc, const char *const *__argv,
			struct linux_binprm *bprm)
{
	int r;
	mm_segment_t oldfs = get_fs();
	struct user_arg_ptr argv = {
		.ptr.native = (const char __user *const  __user *)__argv,
        };

	set_fs(KERNEL_DS);
	r = copy_strings(argc, argv, bprm);
	set_fs(oldfs);

	return r;
}
Contributors
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Linus Torvalds (pre-git)
36
48.00%
2
25.00%
Oleg Nesterov
23
30.67%
2
25.00%
Ollie Wild
8
10.67%
1
12.50%
Linus Torvalds
5
6.67%
1
12.50%
David Howells
2
2.67%
1
12.50%
Hugh Dickins
1
1.33%
1
12.50%
Total
75
100.00%
8
100.00%


EXPORT_SYMBOL(copy_strings_kernel);

#ifdef CONFIG_MMU

/*
 * During bprm_mm_init(), we create a temporary stack at STACK_TOP_MAX.  Once
 * the binfmt code determines where the new stack should reside, we shift it to
 * its final location.  The process proceeds as follows:
 *
 * 1) Use shift to calculate the new vma endpoints.
 * 2) Extend vma to cover both the old and new ranges.  This ensures the
 *    arguments passed to subsequent functions are consistent.
 * 3) Move vma's page tables to the new range.
 * 4) Free up any cleared pgd range.
 * 5) Shrink the vma to cover only the new range.
 */


static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
{
	struct mm_struct *mm = vma->vm_mm;
	unsigned long old_start = vma->vm_start;
	unsigned long old_end = vma->vm_end;
	unsigned long length = old_end - old_start;
	unsigned long new_start = old_start - shift;
	unsigned long new_end = old_end - shift;
	struct mmu_gather tlb;

	BUG_ON(new_start > new_end);

	/*
         * ensure there are no vmas between where we want to go
         * and where we are
         */
	if (vma != find_vma(mm, new_start))
		return -EFAULT;

	/*
         * cover the whole range: [new_start, old_end)
         */
	if (vma_adjust(vma, new_start, old_end, vma->vm_pgoff, NULL))
		return -ENOMEM;

	/*
         * move the page tables downwards, on failure we rely on
         * process cleanup to remove whatever mess we made.
         */
	if (length != move_page_tables(vma, old_start,
				       vma, new_start, length, false))
		return -ENOMEM;

	lru_add_drain();
	tlb_gather_mmu(&tlb, mm, old_start, old_end);
	if (new_end > old_start) {
		/*
                 * when the old and new regions overlap clear from new_end.
                 */
		free_pgd_range(&tlb, new_end, old_end, new_end,
			vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING);
	} else {
		/*
                 * otherwise, clean from old_start; this is done to not touch
                 * the address space in [new_end, old_start) some architectures
                 * have constraints on va-space that make this illegal (IA64) -
                 * for the others its just a little faster.
                 */
		free_pgd_range(&tlb, old_start, old_end, new_end,
			vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING);
	}
	tlb_finish_mmu(&tlb, old_start, old_end);

	/*
         * Shrink the vma to just the new range.  Always succeeds.
         */
	vma_adjust(vma, new_start, new_end, vma->vm_pgoff, NULL);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ollie Wild
164
67.77%
1
6.25%
Matthew Wilcox
42
17.36%
1
6.25%
Rik Van Riel
8
3.31%
1
6.25%
Linus Torvalds (pre-git)
7
2.89%
5
31.25%
Peter Zijlstra
6
2.48%
1
6.25%
Linus Torvalds
4
1.65%
1
6.25%
Andrew Morton
3
1.24%
2
12.50%
Hugh Dickins
2
0.83%
1
6.25%
David Howells
2
0.83%
1
6.25%
Michel Lespinasse
2
0.83%
1
6.25%
Rusty Russell
2
0.83%
1
6.25%
Total
242
100.00%
16
100.00%

/*
 * Finalizes the stack vm_area_struct. The flags and permissions are updated,
 * the stack is optionally relocated, and some extra space is added.
 */


int setup_arg_pages(struct linux_binprm *bprm,
		    unsigned long stack_top,
		    int executable_stack)
{
	unsigned long ret;
	unsigned long stack_shift;
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma = bprm->vma;
	struct vm_area_struct *prev = NULL;
	unsigned long vm_flags;
	unsigned long stack_base;
	unsigned long stack_size;
	unsigned long stack_expand;
	unsigned long rlim_stack;

#ifdef CONFIG_STACK_GROWSUP
	/* Limit stack size */
	stack_base = rlimit_max(RLIMIT_STACK);
	if (stack_base > STACK_SIZE_MAX)
		stack_base = STACK_SIZE_MAX;

	/* Add space for stack randomization. */
	stack_base += (STACK_RND_MASK << PAGE_SHIFT);

	/* Make sure we didn't let the argument array grow too large. */
	if (vma->vm_end - vma->vm_start > stack_base)
		return -ENOMEM;

	stack_base = PAGE_ALIGN(stack_top - stack_base);

	stack_shift = vma->vm_start - stack_base;
	mm->arg_start = bprm->p - stack_shift;
	bprm->p = vma->vm_end - stack_shift;
#else
	stack_top = arch_align_stack(stack_top);
	stack_top = PAGE_ALIGN(stack_top);

	if (unlikely(stack_top < mmap_min_addr) ||
	    unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr))
		return -ENOMEM;

	stack_shift = vma->vm_end - stack_top;

	bprm->p -= stack_shift;
	mm->arg_start = bprm->p;
#endif

	if (bprm->loader)
		bprm->loader -= stack_shift;
	bprm->exec -= stack_shift;

	if (down_write_killable(&mm->mmap_sem))
		return -EINTR;

	vm_flags = VM_STACK_FLAGS;

	/*
         * Adjust stack execute permissions; explicitly enable for
         * EXSTACK_ENABLE_X, disable for EXSTACK_DISABLE_X and leave alone
         * (arch default) otherwise.
         */
	if (unlikely(executable_stack == EXSTACK_ENABLE_X))
		vm_flags |= VM_EXEC;
	else if (executable_stack == EXSTACK_DISABLE_X)
		vm_flags &= ~VM_EXEC;
	vm_flags |= mm->def_flags;
	vm_flags |= VM_STACK_INCOMPLETE_SETUP;

	ret = mprotect_fixup(vma, &prev, vma->vm_start, vma->vm_end,
			vm_flags);
	if (ret)
		goto out_unlock;
	BUG_ON(prev != vma);

	/* Move stack pages down in memory. */
	if (stack_shift) {
		ret = shift_arg_pages(vma, stack_shift);
		if (ret)
			goto out_unlock;
	}

	/* mprotect_fixup is overkill to remove the temporary stack flags */
	vma->vm_flags &= ~VM_STACK_INCOMPLETE_SETUP;

	stack_expand = 131072UL; /* randomly 32*4k (or 2*64k) pages */
	stack_size = vma->vm_end - vma->vm_start;
	/*
         * Align this down to a page boundary as expand_stack
         * will align it up.
         */
	rlim_stack = rlimit(RLIMIT_STACK) & PAGE_MASK;
#ifdef CONFIG_STACK_GROWSUP
	if (stack_size + stack_expand > rlim_stack)
		stack_base = vma->vm_start + rlim_stack;
	else
		stack_base = vma->vm_end + stack_expand;
#else
	if (stack_size + stack_expand > rlim_stack)
		stack_base = vma->vm_end - rlim_stack;
	else
		stack_base = vma->vm_start - stack_expand;
#endif
	current->mm->start_stack = bprm->p;
	ret = expand_stack(vma, stack_base);
	if (ret)
		ret = -EFAULT;

out_unlock:
	up_write(&mm->mmap_sem);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ollie Wild
193
40.04%
1
3.23%
Michael Neuling
73
15.15%
2
6.45%
Matthew Wilcox
41
8.51%
2
6.45%
Linus Torvalds (pre-git)
38
7.88%
8
25.81%
Roland McGrath
28
5.81%
1
3.23%
Andrew Morton
27
5.60%
2
6.45%
Mel Gorman
12
2.49%
1
3.23%
Eric B Munson
10
2.07%
1
3.23%
Helge Deller
9
1.87%
1
3.23%
Michal Hocko
8
1.66%
1
3.23%
Arjan van de Ven
8
1.66%
1
3.23%
Andries E. Brouwer
7
1.45%
1
3.23%
Ingo Molnar
6
1.24%
1
3.23%
Chris Wright
5
1.04%
1
3.23%
Anton Blanchard
4
0.83%
1
3.23%
James Hogan
3
0.62%
1
3.23%
Jiri Slaby
3
0.62%
1
3.23%
Zou Nan hai
3
0.62%
1
3.23%
David Howells
2
0.41%
1
3.23%
Linus Torvalds
1
0.21%
1
3.23%
Hugh Dickins
1
0.21%
1
3.23%
Total
482
100.00%
31
100.00%


EXPORT_SYMBOL(setup_arg_pages);

#else

/*
 * Transfer the program arguments and environment from the holding pages
 * onto the stack. The provided stack pointer is adjusted accordingly.
 */


int transfer_args_to_stack(struct linux_binprm *bprm,
			   unsigned long *sp_location)
{
	unsigned long index, stop, sp;
	int ret = 0;

	stop = bprm->p >> PAGE_SHIFT;
	sp = *sp_location;

	for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
		unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0;
		char *src = kmap(bprm->page[index]) + offset;
		sp -= PAGE_SIZE - offset;
		if (copy_to_user((void *) sp, src, PAGE_SIZE - offset) != 0)
			ret = -EFAULT;
		kunmap(bprm->page[index]);
		if (ret)
			goto out;
	}

	*sp_location = sp;

out:
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nico Pitre
148
100.00%
1
100.00%
Total
148
100.00%
1
100.00%


EXPORT_SYMBOL(transfer_args_to_stack);

#endif /* CONFIG_MMU */



static struct file *do_open_execat(int fd, struct filename *name, int flags)
{
	struct file *file;
	int err;
	struct open_flags open_exec_flags = {
		.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
		.acc_mode = MAY_EXEC,
		.intent = LOOKUP_OPEN,
		.lookup_flags = LOOKUP_FOLLOW,
        };

	if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
		return ERR_PTR(-EINVAL);
	if (flags & AT_SYMLINK_NOFOLLOW)
		open_exec_flags.lookup_flags &= ~LOOKUP_FOLLOW;
	if (flags & AT_EMPTY_PATH)
		open_exec_flags.lookup_flags |= LOOKUP_EMPTY;

	file = do_filp_open(fd, name, &open_exec_flags);
	if (IS_ERR(file))
		goto out;

	err = -EACCES;
	if (!S_ISREG(file_inode(file)->i_mode))
		goto exit;

	if (path_noexec(&file->f_path))
		goto exit;

	err = deny_write_access(file);
	if (err)
		goto exit;

	if (name->name[0] != '\0')
		fsnotify_open(file);

out:
	return file;

exit:
	fput(file);
	return ERR_PTR(err);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Drysdale
71
34.13%
1
5.56%
Al Viro
59
28.37%
5
27.78%
Linus Torvalds (pre-git)
43
20.67%
6
33.33%
Christoph Hellwig
19
9.13%
1
5.56%
Andrew Morton
6
2.88%
1
5.56%
Eric W. Biedermann
4
1.92%
1
5.56%
Linus Torvalds
4
1.92%
1
5.56%
Mimi Zohar
1
0.48%
1
5.56%
Namhyung Kim
1
0.48%
1
5.56%
Total
208
100.00%
18
100.00%



struct file *open_exec(const char *name)
{
	struct filename *filename = getname_kernel(name);
	struct file *f = ERR_CAST(filename);

	if (!IS_ERR(filename)) {
		f = do_open_execat(AT_FDCWD, filename, 0);
		putname(filename);
	}
	return f;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Moore
36
59.02%
1
33.33%
Linus Torvalds
20
32.79%
1
33.33%
David Drysdale
5
8.20%
1
33.33%
Total
61
100.00%
3
100.00%


EXPORT_SYMBOL(open_exec);



int kernel_read(struct file *file, loff_t offset,
		char *addr, unsigned long count)
{
	mm_segment_t old_fs;
	loff_t pos = offset;
	int result;

	old_fs = get_fs();
	set_fs(get_ds());
	/* The cast to a user pointer is valid due to the set_fs() */
	result = vfs_read(file, (void __user *)addr, count, &pos);
	set_fs(old_fs);
	return result;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
63
88.73%
6
66.67%
Linus Torvalds
6
8.45%
1
11.11%
Mimi Zohar
1
1.41%
1
11.11%
Benjamin LaHaise
1
1.41%
1
11.11%
Total
71
100.00%
9
100.00%


EXPORT_SYMBOL(kernel_read);



int kernel_read_file(struct file *file, void **buf, loff_t *size,
		     loff_t max_size, enum kernel_read_file_id id)
{
	loff_t i_size, pos;
	ssize_t bytes = 0;
	int ret;

	if (!S_ISREG(file_inode(file)->i_mode) || max_size < 0)
		return -EINVAL;

	ret = security_kernel_read_file(file, id);
	if (ret)
		return ret;

	ret = deny_write_access(file);
	if (ret)
		return ret;

	i_size = i_size_read(file_inode(file));
	if (max_size > 0 && i_size > max_size) {
		ret = -EFBIG;
		goto out;
	}
	if (i_size <= 0) {
		ret = -EINVAL;
		goto out;
	}

	if (id != READING_FIRMWARE_PREALLOC_BUFFER)
		*buf = vmalloc(i_size);
	if (!*buf) {
		ret = -ENOMEM;
		goto out;
	}

	pos = 0;
	while (pos < i_size) {
		bytes = kernel_read(file, pos, (char *)(*buf) + pos,
				    i_size - pos);
		if (bytes < 0) {
			ret = bytes;
			goto out;
		}

		if (bytes == 0)
			break;
		pos += bytes;
	}

	if (pos != i_size) {
		ret = -EIO;
		goto out_free;
	}

	ret = security_kernel_post_read_file(file, *buf, i_size, id);
	if (!ret)
		*size = pos;

out_free:
	if (ret < 0) {
		if (id != READING_FIRMWARE_PREALLOC_BUFFER) {
			vfree(*buf);
			*buf = NULL;
		}
	}

out:
	allow_write_access(file);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mimi Zohar
246
80.13%
3
60.00%
Dmitry Kasatkin
47
15.31%
1
20.00%
Stephen Boyd
14
4.56%
1
20.00%
Total
307
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(kernel_read_file);



int kernel_read_file_from_path(char *path, void **buf, loff_t *size,
			       loff_t max_size, enum kernel_read_file_id id)
{
	struct file *file;
	int ret;

	if (!path || !*path)
		return -EINVAL;

	file = filp_open(path, O_RDONLY, 0);
	if (IS_ERR(file))
		return PTR_ERR(file);

	ret = kernel_read_file(file, buf, size, max_size, id);
	fput(file);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mimi Zohar
93
100.00%
1
100.00%
Total
93
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(kernel_read_file_from_path);



int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size,
			     enum kernel_read_file_id id)
{
	struct fd f = fdget(fd);
	int ret = -EBADF;

	if (!f.file)
		goto out;

	ret = kernel_read_file(f.file, buf, size, max_size, id);
out:
	fdput(f);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mimi Zohar
76
100.00%
1
100.00%
Total
76
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(kernel_read_file_from_fd);



ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
{
	ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);
	if (res > 0)
		flush_icache_range(addr, addr + len);
	return res;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
58
100.00%
2
100.00%
Total
58
100.00%
2
100.00%


EXPORT_SYMBOL(read_code);



static int exec_mmap(struct mm_struct *mm)
{
	struct task_struct *tsk;
	struct mm_struct *old_mm, *active_mm;

	/* Notify parent that we're no longer interested in the old VM */
	tsk = current;
	old_mm = current->mm;
	mm_release(tsk, old_mm);

	if (old_mm) {
		sync_mm_rss(old_mm);
		/*
                 * Make sure that if there is a core dump in progress
                 * for the old mm, we get out and die instead of going
                 * through with the exec.  We must hold mmap_sem around
                 * checking core_state and changing tsk->mm.
                 */
		down_read(&old_mm->mmap_sem);
		if (unlikely(old_mm->core_state)) {
			up_read(&old_mm->mmap_sem);
			return -EINTR;
		}
	}
	task_lock(tsk);
	active_mm = tsk->active_mm;
	tsk->mm = mm;
	tsk->active_mm = mm;
	activate_mm(active_mm, mm);
	tsk->mm->vmacache_seqnum = 0;
	vmacache_flush(tsk);
	task_unlock(tsk);
	if (old_mm) {
		up_read(&old_mm->mmap_sem);
		BUG_ON(active_mm != old_mm);
		setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm);
		mm_update_next_owner(old_mm);
		mmput(old_mm);
		return 0;
	}
	mmdrop(active_mm);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
60
32.09%
13
54.17%
Roland McGrath
44
23.53%
1
4.17%
Linus Torvalds
39
20.86%
3
12.50%
Oleg Nesterov
14
7.49%
2
8.33%
Davidlohr Bueso A
13
6.95%
1
4.17%
Balbir Singh
5
2.67%
1
4.17%
Konstantin Khlebnikov
5
2.67%
1
4.17%
Robert Love
4
2.14%
1
4.17%
Eric Sesterhenn / Snakebyte
3
1.60%
1
4.17%
Total
187
100.00%
24
100.00%

/*
 * This function makes sure the current process has its own signal table,
 * so that flush_signal_handlers can later reset the handlers without
 * disturbing other processes.  (Other processes might share the signal
 * table via the CLONE_SIGHAND option to clone().)
 */


static int de_thread(struct task_struct *tsk)
{
	struct signal_struct *sig = tsk->signal;
	struct sighand_struct *oldsighand = tsk->sighand;
	spinlock_t *lock = &oldsighand->siglock;

	if (thread_group_empty(tsk))
		goto no_thread_group;

	/*
         * Kill all other threads in the thread group.
         */
	spin_lock_irq(lock);
	if (signal_group_exit(sig)) {
		/*
                 * Another group action in progress, just
                 * return so that the signal is processed.
                 */
		spin_unlock_irq(lock);
		return -EAGAIN;
	}

	sig->group_exit_task = tsk;
	sig->notify_count = zap_other_threads(tsk);
	if (!thread_group_leader(tsk))
		sig->notify_count--;

	while (sig->notify_count) {
		__set_current_state(TASK_KILLABLE);
		spin_unlock_irq(lock);
		schedule();
		if (unlikely(__fatal_signal_pending(tsk)))
			goto killed;
		spin_lock_irq(lock);
	}
	spin_unlock_irq(lock);

	/*
         * At this point all other threads have exited, all we have to
         * do is to wait for the thread group leader to become inactive,
         * and to assume its PID:
         */
	if (!thread_group_leader(tsk)) {
		struct task_struct *leader = tsk->group_leader;

		for (;;) {
			cgroup_threadgroup_change_begin(tsk);
			write_lock_irq(&tasklist_lock);
			/*
                         * Do this under tasklist_lock to ensure that
                         * exit_notify() can't miss ->group_exit_task
                         */
			sig->notify_count = -1;
			if (likely(leader->exit_state))
				break;
			__set_current_state(TASK_KILLABLE);
			write_unlock_irq(&tasklist_lock);
			cgroup_threadgroup_change_end(tsk);
			schedule();
			if (unlikely(__fatal_signal_pending(tsk)))
				goto killed;
		}

		/*
                 * The only record we have of the real-time age of a
                 * process, regardless of execs it's done, is start_time.
                 * All the past CPU time is accumulated in signal_struct
                 * from sister threads now dead.  But in this non-leader
                 * exec, nothing survives from the original leader thread,
                 * whose birth marks the true age of this process now.
                 * When we take on its identity by switching to its PID, we
                 * also take its birthdate (always earlier than our own).
                 */
		tsk->start_time = leader->start_time;
		tsk->real_start_time = leader->real_start_time;

		BUG_ON(!same_thread_group(leader, tsk));
		BUG_ON(has_group_leader_pid(tsk));
		/*
                 * An exec() starts a new thread group with the
                 * TGID of the previous thread group. Rehash the
                 * two threads with a switched PID, and release
                 * the former thread group leader:
                 */

		/* Become a process group leader with the old leader's pid.
                 * The old leader becomes a thread of the this thread group.
                 * Note: The old leader also uses this pid until release_task
                 *       is called.  Odd but simple and correct.
                 */
		tsk->pid = leader->pid;
		change_pid(tsk, PIDTYPE_PID, task_pid(leader));
		transfer_pid(leader, tsk, PIDTYPE_PGID);
		transfer_pid(leader, tsk, PIDTYPE_SID);

		list_replace_rcu(&leader->tasks, &tsk->tasks);
		list_replace_init(&leader->sibling, &tsk->sibling);

		tsk->group_leader = tsk;
		leader->group_leader = tsk;

		tsk->exit_signal = SIGCHLD;
		leader->exit_signal = -1;

		BUG_ON(leader->exit_state != EXIT_ZOMBIE);
		leader->exit_state = EXIT_DEAD;

		/*
                 * We are going to release_task()->ptrace_unlink() silently,
                 * the tracer can sleep in do_wait(). EXIT_DEAD guarantees
                 * the tracer wont't block again waiting for this thread.
                 */
		if (unlikely(leader->ptrace))
			__wake_up_parent(leader, leader->parent);
		write_unlock_irq(&tasklist_lock);
		cgroup_threadgroup_change_end(tsk);

		release_task(leader);
	}

	sig->group_exit_task = NULL;
	sig->notify_count = 0;

no_thread_group:
	/* we have changed execution domain */
	tsk->exit_signal = SIGCHLD;

#ifdef CONFIG_POSIX_TIMERS
	exit_itimers(sig);
	flush_itimer_signals();
#endif

	if (atomic_read(&oldsighand->count) != 1) {
		struct sighand_struct *newsighand;
		/*
                 * This ->sighand is shared with the CLONE_SIGHAND
                 * but not CLONE_THREAD task, switch to the new one.
                 */
		newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL);
		if (!newsighand)
			return -ENOMEM;

		atomic_set(&newsighand->count, 1);
		memcpy(newsighand->action, oldsighand->action,
		       sizeof(newsighand->action));

		write_lock_irq(&tasklist_lock);
		spin_lock(&oldsighand->siglock);
		rcu_assign_pointer(tsk->sighand, newsighand);
		spin_unlock(&oldsighand->siglock);
		write_unlock_irq(&tasklist_lock);

		__cleanup_sighand(oldsighand);
	}

	BUG_ON(!thread_group_leader(tsk));
	return 0;

killed:
	/* protects against exit_notify() and __exit_signal() */
	read_lock(&tasklist_lock);
	sig->group_exit_task = NULL;
	sig->notify_count = 0;
	read_unlock(&tasklist_lock);
	return -EAGAIN;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
257
43.19%
19
41.30%
Ingo Molnar
118
19.83%
9
19.57%
Roland McGrath
59
9.92%
2
4.35%
Eric W. Biedermann
55
9.24%
4
8.70%
Linus Torvalds
50
8.40%
2
4.35%
Linus Torvalds (pre-git)
27
4.54%
3
6.52%
Kirill Tkhai
8
1.34%
1
2.17%
Pavel Emelyanov
8
1.34%
1
2.17%
Nico Pitre
5
0.84%
1
2.17%
Sukadev Bhattiprolu
4
0.67%
2
4.35%
Andrew Morton
3
0.50%
1
2.17%
Davide Libenzi
1
0.17%
1
2.17%
Total
595
100.00%
46
100.00%



char *get_task_comm(char *buf, struct task_struct *tsk)
{
	/* buf must be at least sizeof(tsk->comm) in size */
	task_lock(tsk);
	strncpy(buf, tsk->comm, sizeof(tsk->comm));
	task_unlock(tsk);
	return buf;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Kravetz
39
86.67%
1
33.33%
Andrew Morton
5
11.11%
1
33.33%
Prasanna Meda
1
2.22%
1
33.33%
Total
45
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(get_task_comm);

/*
 * These functions flushes out all traces of the currently running executable
 * so that a new one can be started
 */



void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec)
{
	task_lock(tsk);
	trace_task_rename(tsk, buf);
	strlcpy(tsk->comm, buf, sizeof(tsk->comm));
	task_unlock(tsk);
	perf_event_comm(tsk, exec);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Kravetz
39
67.24%
1
16.67%
Kamezawa Hiroyuki
7
12.07%
1
16.67%
Adrian Hunter
6
10.34%
1
16.67%
Peter Zijlstra
4
6.90%
1
16.67%
Ingo Molnar
1
1.72%
1
16.67%
Oleg Nesterov
1
1.72%
1
16.67%
Total
58
100.00%
6
100.00%



int flush_old_exec(struct linux_binprm * bprm)
{
	int retval;

	/*
         * Make sure we have a private signal table and that
         * we are unassociated from the previous thread group.
         */
	retval = de_thread(current);
	if (retval)
		goto out;

	/*
         * Must be called _before_ exec_mmap() as bprm->mm is
         * not visibile until then. This also enables the update
         * to be lockless.
         */
	set_mm_exe_file(bprm->mm, bprm->file);

	/*
         * Release all of the old mmap stuff
         */
	acct_arg_size(bprm, 0);
	retval = exec_mmap(bprm->mm);
	if (retval)
		goto out;

	bprm->mm = NULL;		/* We're using it now */

	set_fs(USER_DS);
	current->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD |
					PF_NOFREEZE | PF_NO_SETAFFINITY);
	flush_thread();
	current->personality &= ~bprm->per_clear;

	/*
         * We have to apply CLOEXEC before we change whether the process is
         * dumpable (in setup_new_exec) to avoid a race with a process in userspace
         * trying to access the should-be-closed file descriptors of a process
         * undergoing exec(2).
         */
	do_close_on_exec(current->files);
	return 0;

out:
	return retval;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
31
25.62%
4
17.39%
Linus Torvalds (pre-git)
23
19.01%
5
21.74%
Andrew Morton
15
12.40%
2
8.70%
Matt Helsley
11
9.09%
1
4.35%
Oleg Nesterov
9
7.44%
2
8.70%
Ingo Molnar
9
7.44%
2
8.70%
Aleksa Sarai
8
6.61%
1
4.35%
Mathias Krause
5
4.13%
1
4.35%
Motohiro Kosaki
4
3.31%
1
4.35%
Al Viro
3
2.48%
2
8.70%
Yi Zhang
2
1.65%
1
4.35%
Davidlohr Bueso A
1
0.83%
1
4.35%
Total
121
100.00%
23
100.00%


EXPORT_SYMBOL(flush_old_exec);



void would_dump(struct linux_binprm *bprm, struct file *file)
{
	struct inode *inode = file_inode(file);
	if (inode_permission(inode, MAY_READ) < 0) {
		struct user_namespace *old, *user_ns;
		bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;

		/* Ensure mm->user_ns contains the executable */
		user_ns = old = bprm->mm->user_ns;
		while ((user_ns != &init_user_ns) &&
		       !privileged_wrt_inode_uidgid(user_ns, inode))
			user_ns = user_ns->parent;

		if (old != user_ns) {
			bprm->mm->user_ns = get_user_ns(user_ns);
			put_user_ns(old);
		}
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
79
71.82%
1
33.33%
Al Viro
31
28.18%
2
66.67%
Total
110
100.00%
3
100.00%


EXPORT_SYMBOL(would_dump);



void setup_new_exec(struct linux_binprm * bprm)
{
	arch_pick_mmap_layout(current->mm);

	/* This is the point of no return */
	current->sas_ss_sp = current->sas_ss_size = 0;

	if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid()))
		set_dumpable(current->mm, SUID_DUMP_USER);
	else
		set_dumpable(current->mm, suid_dumpable);

	perf_event_exec();
	__set_task_comm(current, kbasename(bprm->filename), true);

	/* Set the new mm task size. We have to do that late because it may
         * depend on TIF_32BIT which is only updated in flush_thread() on
         * some architectures like powerpc
         */
	current->mm->task_size = TASK_SIZE;

	/* install the new credentials */
	if (!uid_eq(bprm->cred->uid, current_euid()) ||
	    !gid_eq(bprm->cred->gid, current_egid())) {
		current->pdeath_signal = 0;
	} else {
		if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)
			set_dumpable(current->mm, suid_dumpable);
	}

	/* An exec changes our domain. We are no longer part of the thread
           group */
	current->self_exec_id++;
	flush_signal_handlers(current, 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
40
24.54%
6
22.22%
Linus Torvalds
20
12.27%
3
11.11%
David Howells
20
12.27%
4
14.81%
Eric W. Biedermann
18
11.04%
1
3.70%
Hidehiro Kawai
12
7.36%
1
3.70%
Marcel Holtmann
9
5.52%
1
3.70%
Benjamin Herrenschmidt
9
5.52%
1
3.70%
Alan Cox
7
4.29%
1
3.70%
Mike Kravetz
5
3.07%
1
3.70%
Yoav Zach
5
3.07%
1
3.70%
Al Viro
4
2.45%
1
3.70%
Oleg Nesterov
4
2.45%
1
3.70%
Peter Zijlstra
3
1.84%
1
3.70%
Adrian Hunter
3
1.84%
1
3.70%
Heiko Carstens
2
1.23%
1
3.70%
Ingo Molnar
1
0.61%
1
3.70%
Kees Cook
1
0.61%
1
3.70%
Total
163
100.00%
27
100.00%


EXPORT_SYMBOL(setup_new_exec);

/*
 * Prepare credentials and lock ->cred_guard_mutex.
 * install_exec_creds() commits the new creds and drops the lock.
 * Or, if exec fails before, free_bprm() should release ->cred and
 * and unlock.
 */


int prepare_bprm_creds(struct linux_binprm *bprm)
{
	if (mutex_lock_interruptible(&current->signal->cred_guard_mutex))
		return -ERESTARTNOINTR;

	bprm->cred = prepare_exec_creds();
	if (likely(bprm->cred))
		return 0;

	mutex_unlock(&current->signal->cred_guard_mutex);
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
55
93.22%
1
50.00%
Motohiro Kosaki
4
6.78%
1
50.00%
Total
59
100.00%
2
100.00%



static void free_bprm(struct linux_binprm *bprm)
{
	free_arg_pages(bprm);
	if (bprm->cred) {
		mutex_unlock(&current->signal->cred_guard_mutex);
		abort_creds(bprm->cred);
	}
	if (bprm->file) {
		allow_write_access(bprm->file);
		fput(bprm->file);
	}
	/* If a binfmt changed the interp, free it. */
	if (bprm->interp != bprm->filename)
		kfree(bprm->interp);
	kfree(bprm);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
65
75.58%
2
40.00%
Kees Cook
18
20.93%
1
20.00%
Motohiro Kosaki
2
2.33%
1
20.00%
Linus Torvalds
1
1.16%
1
20.00%
Total
86
100.00%
5
100.00%



int bprm_change_interp(char *interp, struct linux_binprm *bprm)
{
	/* If a binfmt changed the interp, free it first. */
	if (bprm->interp != bprm->filename)
		kfree(bprm->interp);
	bprm->interp = kstrdup(interp, GFP_KERNEL);
	if (!bprm->interp)
		return -ENOMEM;
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Kees Cook
57
100.00%
1
100.00%
Total
57
100.00%
1
100.00%


EXPORT_SYMBOL(bprm_change_interp);

/*
 * install the new credentials for this executable
 */


void install_exec_creds(struct linux_binprm *bprm)
{
	security_bprm_committing_creds(bprm);

	commit_creds(bprm->cred);
	bprm->cred = NULL;

	/*
         * Disable monitoring for regular users
         * when executing setuid binaries. Must
         * wait until new credentials are committed
         * by commit_creds() above
         */
	if (get_dumpable(current->mm) != SUID_DUMP_USER)
		perf_event_exit_task(current);
	/*
         * cred_guard_mutex must be held at least to this point to prevent
         * ptrace_attach() from altering our determination of the task's
         * credentials; any time after this it may be unlocked.
         */
	security_bprm_committed_creds(bprm);
	mutex_unlock(&current->signal->cred_guard_mutex);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
33
54.10%
1
25.00%
Stéphane Eranian
17
27.87%
1
25.00%
Oleg Nesterov
9
14.75%
1
25.00%
Motohiro Kosaki
2
3.28%
1
25.00%
Total
61
100.00%
4
100.00%


EXPORT_SYMBOL(install_exec_creds);

/*
 * determine how safe it is to execute the proposed program
 * - the caller must hold ->cred_guard_mutex to protect against
 *   PTRACE_ATTACH or seccomp thread-sync
 */


static void check_unsafe_exec(struct linux_binprm *bprm)
{
	struct task_struct *p = current, *t;
	unsigned n_fs;

	if (p->ptrace)
		bprm->unsafe |= LSM_UNSAFE_PTRACE;

	/*
         * This isn't strictly necessary, but it makes it harder for LSMs to
         * mess up.
         */
	if (task_no_new_privs(current))
		bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;

	t = p;
	n_fs = 1;
	spin_lock(&p->fs->lock);
	rcu_read_lock();
	while_each_thread(p, t) {
		if (t->fs == p->fs)
			n_fs++;
	}
	rcu_read_unlock();

	if (p->fs->users > n_fs)
		bprm->unsafe |= LSM_UNSAFE_SHARE;
	else
		p->fs->in_exec = 1;
	spin_unlock(&p->fs->lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
60
46.15%
2
18.18%
Al Viro
29
22.31%
2
18.18%
Oleg Nesterov
14
10.77%
3
27.27%
Andrew Lutomirski
11
8.46%
1
9.09%
Tejun Heo
11
8.46%
1
9.09%
Kees Cook
3
2.31%
1
9.09%
Nicholas Piggin
2
1.54%
1
9.09%
Total
130
100.00%
11
100.00%



static void bprm_fill_uid(struct linux_binprm *bprm)
{
	struct inode *inode;
	unsigned int mode;
	kuid_t uid;
	kgid_t gid;

	/*
         * Since this can be called multiple times (via prepare_binprm),
         * we must clear any previous work done when setting set[ug]id
         * bits from any earlier bprm->file uses (for example when run
         * first for a setuid script then again for its interpreter).
         */
	bprm->cred->euid = current_euid();
	bprm->cred->egid = current_egid();

	if (!mnt_may_suid(bprm->file->f_path.mnt))
		return;

	if (task_no_new_privs(current))
		return;

	inode = bprm->file->f_path.dentry->d_inode;
	mode = READ_ONCE(inode->i_mode);
	if (!(mode & (S_ISUID|S_ISGID)))
		return;

	/* Be careful if suid/sgid is set */
	inode_lock(inode);

	/* reload atomically mode/uid/gid now that lock held */
	mode = inode->i_mode;
	uid = inode->i_uid;
	gid = inode->i_gid;
	inode_unlock(inode);

	/* We ignore suid/sgid if there are no mappings for them in the ns */
	if (!kuid_has_mapping(bprm->cred->user_ns, uid) ||
		 !kgid_has_mapping(bprm->cred->user_ns, gid))
		return;

	if (mode & S_ISUID) {
		bprm->per_clear |= PER_CLEAR_ON_SETID;
		bprm->cred->euid = uid;
	}

	if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
		bprm->per_clear |= PER_CLEAR_ON_SETID;
		bprm->cred->egid = gid;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jann Horn
84
38.71%
1
4.17%
Linus Torvalds (pre-git)
54
24.88%
9
37.50%
Eric W. Biedermann
26
11.98%
2
8.33%
David Howells
18
8.29%
2
8.33%
Ingo Molnar
9
4.15%
1
4.17%
Vivek Goyal
6
2.76%
1
4.17%
Andrew Lutomirski
5
2.30%
2
8.33%
Linus Torvalds
4
1.84%
1
4.17%
Al Viro
4
1.84%
2
8.33%
Kees Cook
4
1.84%
2
8.33%
Josef 'Jeff' Sipek
3
1.38%
1
4.17%
Total
217
100.00%
24
100.00%

/*
 * Fill the binprm structure from the inode.
 * Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes
 *
 * This may be called multiple times for binary chains (scripts for example).
 */


int prepare_binprm(struct linux_binprm *bprm)
{
	int retval;

	bprm_fill_uid(bprm);

	/* fill in binprm security blob */
	retval = security_bprm_set_creds(bprm);
	if (retval)
		return retval;
	bprm->cred_prepared = 1;

	memset(bprm->buf, 0, BINPRM_BUF_SIZE);
	return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
32
48.48%
3
42.86%
Jann Horn
17
25.76%
1
14.29%
Greg Kroah-Hartman
10
15.15%
2
28.57%
David Howells
7
10.61%
1
14.29%
Total
66
100.00%
7
100.00%


EXPORT_SYMBOL(prepare_binprm);

/*
 * Arguments are '\0' separated strings found at the location bprm->p
 * points to; chop off the first by relocating brpm->p to right after
 * the first '\0' encountered.
 */


int remove_arg_zero(struct linux_binprm *bprm)
{
	int ret = 0;
	unsigned long offset;
	char *kaddr;
	struct page *page;

	if (!bprm->argc)
		return 0;

	do {
		offset = bprm->p & ~PAGE_MASK;
		page = get_arg_page(bprm, bprm->p, 0);
		if (!page) {
			ret = -EFAULT;
			goto out;
		}
		kaddr = kmap_atomic(page);

		for (; offset < PAGE_SIZE && kaddr[offset];
				offset++, bprm->p++)
			;

		kunmap_atomic(kaddr);
		put_arg_page(page);
	} while (offset == PAGE_SIZE);

	bprm->p++;
	bprm->argc--;
	ret = 0;

out:
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ollie Wild
74
52.11%
1
20.00%
Linus Torvalds (pre-git)
49
34.51%
2
40.00%
Nicholas Piggin
16
11.27%
1
20.00%
Andrew Morton
3
2.11%
1
20.00%
Total
142
100.00%
5
100.00%


EXPORT_SYMBOL(remove_arg_zero);


#define printable(c) (((c)=='\t') || ((c)=='\n') || (0x20<=(c) && (c)<=0x7e))
/*
 * cycle the list of binary formats handler, until one recognizes the image
 */


int search_binary_handler(struct linux_binprm *bprm)
{
	bool need_retry = IS_ENABLED(CONFIG_MODULES);
	struct linux_binfmt *fmt;
	int retval;

	/* This allows 4 levels of binfmt rewrites before failing hard. */
	if (bprm->recursion_depth > 5)
		return -ELOOP;

	retval = security_bprm_check(bprm);
	if (retval)
		return retval;

	retval = -ENOENT;
 retry:
	read_lock(&binfmt_lock);
	list_for_each_entry(fmt, &formats, lh) {
		if (!try_module_get(fmt->module))
			continue;
		read_unlock(&binfmt_lock);
		bprm->recursion_depth++;
		retval = fmt->load_binary(bprm);
		read_lock(&binfmt_lock);
		put_binfmt(fmt);
		bprm->recursion_depth--;
		if (retval < 0 && !bprm->mm) {
			/* we got to flush_old_exec() and failed after it */
			read_unlock(&binfmt_lock);
			force_sigsegv(SIGSEGV, current);
			return retval;
		}
		if (retval != -ENOEXEC || !bprm->file) {
			read_unlock(&binfmt_lock);
			return retval;
		}
	}
	read_unlock(&binfmt_lock);

	if (need_retry) {
		if (printable(bprm->buf[0]) && printable(bprm->buf[1]) &&
		    printable(bprm->buf[2]) && printable(bprm->buf[3]))
			return retval;
		if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0)
			return retval;
		need_retry = false;
		goto retry;
	}

	return retval;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
129
48.13%
14
46.67%
Oleg Nesterov
46
17.16%
5
16.67%
Al Viro
43
16.04%
1
3.33%
Kees Cook
14
5.22%
1
3.33%
Greg Kroah-Hartman
14
5.22%
3
10.00%
Alexey Dobriyan
8
2.99%
1
3.33%
Chris Wright
5
1.87%
1
3.33%
Roland McGrath
4
1.49%
1
3.33%
Andrew Morton
3
1.12%
1
3.33%
Christoph Hellwig
1
0.37%
1
3.33%
Linus Torvalds
1
0.37%
1
3.33%
Total
268
100.00%
30
100.00%


EXPORT_SYMBOL(search_binary_handler);



static int exec_binprm(struct linux_binprm *bprm)
{
	pid_t old_pid, old_vpid;
	int ret;

	/* Need to fetch pid before load_binary changes it */
	old_pid = current->pid;
	rcu_read_lock();
	old_vpid = task_pid_nr_ns(current, task_active_pid_ns(current->parent));
	rcu_read_unlock();

	ret = search_binary_handler(bprm);
	if (ret >= 0) {
		audit_bprm(bprm);
		trace_sched_process_exec(current, old_pid, bprm);
		ptrace_event(PTRACE_EVENT_EXEC, old_vpid);
		proc_exec_connector(current);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
85
94.44%
2
66.67%
Linus Torvalds
5
5.56%
1
33.33%
Total
90
100.00%
3
100.00%

/*
 * sys_execve() executes a new program.
 */


static int do_execveat_common(int fd, struct filename *filename,
			      struct user_arg_ptr argv,
			      struct user_arg_ptr envp,
			      int flags)
{
	char *pathbuf = NULL;
	struct linux_binprm *bprm;
	struct file *file;
	struct files_struct *displaced;
	int retval;

	if (IS_ERR(filename))
		return PTR_ERR(filename);

	/*
         * We move the actual failure in case of RLIMIT_NPROC excess from
         * set*uid() to execve() because too many poorly written programs
         * don't check setuid() return code.  Here we additionally recheck
         * whether NPROC limit is still exceeded.
         */
	if ((current->flags & PF_NPROC_EXCEEDED) &&
	    atomic_read(&current_user()->processes) > rlimit(RLIMIT_NPROC)) {
		retval = -EAGAIN;
		goto out_ret;
	}

	/* We're below the limit (still or again), so we don't want to make
         * further execve() calls fail. */
	current->flags &= ~PF_NPROC_EXCEEDED;

	retval = unshare_files(&displaced);
	if (retval)
		goto out_ret;

	retval = -ENOMEM;
	bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
	if (!bprm)
		goto out_files;

	retval = prepare_bprm_creds(bprm);
	if (retval)
		goto out_free;

	check_unsafe_exec(bprm);
	current->in_execve = 1;

	file = do_open_execat(fd, filename, flags);
	retval = PTR_ERR(file);
	if (IS_ERR(file))
		goto out_unmark;

	sched_exec();

	bprm->file = file;
	if (fd == AT_FDCWD || filename->name[0] == '/') {
		bprm->filename = filename->name;
	} else {
		if (filename->name[0] == '\0')
			pathbuf = kasprintf(GFP_TEMPORARY, "/dev/fd/%d", fd);
		else
			pathbuf = kasprintf(GFP_TEMPORARY, "/dev/fd/%d/%s",
					    fd, filename->name);
		if (!pathbuf) {
			retval = -ENOMEM;
			goto out_unmark;
		}
		/*
                 * Record that a name derived from an O_CLOEXEC fd will be
                 * inaccessible after exec. Relies on having exclusive access to
                 * current->files (due to unshare_files above).
                 */
		if (close_on_exec(fd, rcu_dereference_raw(current->files->fdt)))
			bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE;
		bprm->filename = pathbuf;
	}
	bprm->interp = bprm->filename;

	retval = bprm_mm_init(bprm);
	if (retval)
		goto out_unmark;

	bprm->argc = count(argv, MAX_ARG_STRINGS);
	if ((retval = bprm->argc) < 0)
		goto out;

	bprm->envc = count(envp, MAX_ARG_STRINGS);
	if ((retval = bprm->envc) < 0)
		goto out;

	retval = prepare_binprm(bprm);
	if (retval < 0)
		goto out;

	retval = copy_strings_kernel(1, &bprm->filename, bprm);
	if (retval < 0)
		goto out;

	bprm->exec = bprm->p;
	retval = copy_strings(bprm->envc, envp, bprm);
	if (retval < 0)
		goto out;

	retval = copy_strings(bprm->argc, argv, bprm);
	if (retval < 0)
		goto out;

	would_dump(bprm, bprm->file);

	retval = exec_binprm(bprm);
	if (retval < 0)
		goto out;

	/* execve succeeded */
	current->fs->in_exec = 0;
	current->in_execve = 0;
	acct_update_integrals(current);
	task_numa_free(current);
	free_bprm(bprm);
	kfree(pathbuf);
	putname(filename);
	if (displaced)
		put_files_struct(displaced);
	return retval;

out:
	if (bprm->mm) {
		acct_arg_size(bprm, 0);
		mmput(bprm->mm);
	}

out_unmark:
	current->fs->in_exec = 0;
	current->in_execve = 0;

out_free:
	free_bprm(bprm);
	kfree(pathbuf);

out_files:
	if (displaced)
		reset_files_struct(displaced);
out_ret:
	putname(filename);
	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
164
25.91%
14
34.15%
David Drysdale
136
21.48%
1
2.44%
Linus Torvalds
90
14.22%
3
7.32%
Al Viro
62
9.79%
4
9.76%
Vasiliy Kulikov
41
6.48%
1
2.44%
Denys Vlasenko
39
6.16%
1
2.44%
Oleg Nesterov
28
4.42%
6
14.63%
David Howells
22
3.48%
1
2.44%
Kentaro Takeda
12
1.90%
1
2.44%
Greg Kroah-Hartman
10
1.58%
1
2.44%
Eric W. Biedermann
9
1.42%
1
2.44%
Andrew Morton
5
0.79%
2
4.88%
Rik Van Riel
5
0.79%
1
2.44%
Ollie Wild
4
0.63%
1
2.44%
Christoph Lameter
3
0.47%
1
2.44%
Jay Lan
2
0.32%
1
2.44%
Oliver Neukum
1
0.16%
1
2.44%
Total
633
100.00%
41
100.00%



int do_execve(struct filename *filename,
	const char __user *const __user *__argv,
	const char __user *const __user *__envp)
{
	struct user_arg_ptr argv = { .ptr.native = __argv };
	struct user_arg_ptr envp = { .ptr.native = __envp };
	return do_execveat_common(AT_FDCWD, filename, argv, envp, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
58
85.29%
2
50.00%
David Drysdale
8
11.76%
1
25.00%
Linus Torvalds
2
2.94%
1
25.00%
Total
68
100.00%
4
100.00%



int do_execveat(int fd, struct filename *filename,
		const char __user *const __user *__argv,
		const char __user *const __user *__envp,
		int flags)
{
	struct user_arg_ptr argv = { .ptr.native = __argv };
	struct user_arg_ptr envp = { .ptr.native = __envp };

	return do_execveat_common(fd, filename, argv, envp, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Drysdale
71
95.95%
1
50.00%
Oleg Nesterov
3
4.05%
1
50.00%
Total
74
100.00%
2
100.00%

#ifdef CONFIG_COMPAT


static int compat_do_execve(struct filename *filename,
	const compat_uptr_t __user *__argv,
	const compat_uptr_t __user *__envp)
{
	struct user_arg_ptr argv = {
		.is_compat = true,
		.ptr.compat = __argv,
        };
	struct user_arg_ptr envp = {
		.is_compat = true,
		.ptr.compat = __envp,
        };
	return do_execveat_common(AT_FDCWD, filename, argv, envp, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
60
82.19%
1
20.00%
David Drysdale
8
10.96%
1
20.00%
Al Viro
3
4.11%
2
40.00%
Linus Torvalds
2
2.74%
1
20.00%
Total
73
100.00%
5
100.00%



static int compat_do_execveat(int fd, struct filename *filename,
			      const compat_uptr_t __user *__argv,
			      const compat_uptr_t __user *__envp,
			      int flags)
{
	struct user_arg_ptr argv = {
		.is_compat = true,
		.ptr.compat = __argv,
        };
	struct user_arg_ptr envp = {
		.is_compat = true,
		.ptr.compat = __envp,
        };
	return do_execveat_common(fd, filename, argv, envp, flags);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Drysdale
76
96.20%
1
50.00%
Oleg Nesterov
3
3.80%
1
50.00%
Total
79
100.00%
2
100.00%

#endif



void set_binfmt(struct linux_binfmt *new)
{
	struct mm_struct *mm = current->mm;

	if (mm->binfmt)
		module_put(mm->binfmt->module);

	mm->binfmt = new;
	if (new)
		__module_get(new->module);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
29
56.86%
1
33.33%
Hiroshi Shimamoto
12
23.53%
1
33.33%
Oleg Nesterov
10
19.61%
1
33.33%
Total
51
100.00%
3
100.00%


EXPORT_SYMBOL(set_binfmt);

/*
 * set_dumpable stores three-value SUID_DUMP_* into mm->flags.
 */


void set_dumpable(struct mm_struct *mm, int value)
{
	unsigned long old, new;

	if (WARN_ON((unsigned)value > SUID_DUMP_ROOT))
		return;

	do {
		old = ACCESS_ONCE(mm->flags);
		new = (old & ~MMF_DUMPABLE_MASK) | value;
	} while (cmpxchg(&mm->flags, old, new) != old);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
43
59.72%
2
50.00%
Alex Kelly
19
26.39%
1
25.00%
Xiaotian Feng
10
13.89%
1
25.00%
Total
72
100.00%
4
100.00%


SYSCALL_DEFINE3(execve,
		const char __user *, filename,
		const char __user *const __user *, argv,
		const char __user *const __user *, envp)
{
	return do_execve(getname(filename), argv, envp);
}


SYSCALL_DEFINE5(execveat,
		int, fd, const char __user *, filename,
		const char __user *const __user *, argv,
		const char __user *const __user *, envp,
		int, flags)
{
	int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0;

	return do_execveat(fd,
			   getname_flags(filename, lookup_flags, NULL),
			   argv, envp, flags);
}

#ifdef CONFIG_COMPAT

COMPAT_SYSCALL_DEFINE3(execve, const char __user *, filename,
	const compat_uptr_t __user *, argv,
	const compat_uptr_t __user *, envp)
{
	return compat_do_execve(getname(filename), argv, envp);
}


COMPAT_SYSCALL_DEFINE5(execveat, int, fd,
		       const char __user *, filename,
		       const compat_uptr_t __user *, argv,
		       const compat_uptr_t __user *, envp,
		       int,  flags)
{
	int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0;

	return compat_do_execveat(fd,
				  getname_flags(filename, lookup_flags, NULL),
				  argv, envp, flags);
}
#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Ollie Wild
1303
16.92%
1
0.28%
Linus Torvalds (pre-git)
1187
15.42%
71
19.83%
Oleg Nesterov
1077
13.99%
44
12.29%
David Drysdale
495
6.43%
1
0.28%
Al Viro
470
6.10%
25
6.98%
Mimi Zohar
435
5.65%
7
1.96%
Linus Torvalds
331
4.30%
23
6.42%
Eric W. Biedermann
229
2.97%
9
2.51%
David Howells
182
2.36%
7
1.96%
Roland McGrath
169
2.19%
8
2.23%
Ingo Molnar
162
2.10%
19
5.31%
Nico Pitre
161
2.09%
2
0.56%
Andrew Morton
139
1.81%
12
3.35%
Kees Cook
103
1.34%
6
1.68%
Jann Horn
102
1.32%
1
0.28%
Mike Kravetz
83
1.08%
1
0.28%
Matthew Wilcox
83
1.08%
2
0.56%
Michael Neuling
73
0.95%
2
0.56%
Arnaldo Carvalho de Melo
48
0.62%
1
0.28%
Dmitry Kasatkin
47
0.61%
1
0.28%
Vasiliy Kulikov
41
0.53%
1
0.28%
Denys Vlasenko
39
0.51%
1
0.28%
Greg Kroah-Hartman
37
0.48%
4
1.12%
Paul Moore
36
0.47%
1
0.28%
Christoph Hellwig
31
0.40%
6
1.68%
Alexey Dobriyan
30
0.39%
2
0.56%
Heiko Carstens
26
0.34%
3
0.84%
Michal Hocko
25
0.32%
3
0.84%
Rik Van Riel
21
0.27%
2
0.56%
Mel Gorman
20
0.26%
1
0.28%
Alex Kelly
19
0.25%
1
0.28%
Nicholas Piggin
19
0.25%
2
0.56%
Ivan Kokshaysky
18
0.23%
1
0.28%
Stéphane Eranian
17
0.22%
1
0.28%
Davidlohr Bueso A
17
0.22%
2
0.56%
Lorenzo Stoakes
17
0.22%
2
0.56%
Andrew Lutomirski
16
0.21%
2
0.56%
Matt Helsley
14
0.18%
2
0.56%
Stephen Boyd
14
0.18%
1
0.28%
Peter Zijlstra
13
0.17%
3
0.84%
Alan Cox
13
0.17%
2
0.56%
Hidehiro Kawai
12
0.16%
1
0.28%
Motohiro Kosaki
12
0.16%
2
0.56%
Luiz Fernando N. Capitulino
12
0.16%
1
0.28%
Hiroshi Shimamoto
12
0.16%
1
0.28%
Kentaro Takeda
12
0.16%
1
0.28%
Tejun Heo
11
0.14%
1
0.28%
Hugh Dickins
11
0.14%
5
1.40%
Xiaotian Feng
10
0.13%
1
0.28%
Kamezawa Hiroyuki
10
0.13%
1
0.28%
Eric B Munson
10
0.13%
1
0.28%
Chris Wright
10
0.13%
2
0.56%
Aleksa Sarai
9
0.12%
1
0.28%
Dave Hansen
9
0.12%
2
0.56%
Benjamin Herrenschmidt
9
0.12%
1
0.28%
Helge Deller
9
0.12%
1
0.28%
Adrian Hunter
9
0.12%
1
0.28%
Marcel Holtmann
9
0.12%
1
0.28%
Kirill Tkhai
8
0.10%
1
0.28%
Arjan van de Ven
8
0.10%
1
0.28%
Pavel Emelyanov
8
0.10%
1
0.28%
Andries E. Brouwer
7
0.09%
1
0.28%
Sukadev Bhattiprolu
7
0.09%
3
0.84%
Vivek Goyal
6
0.08%
1
0.28%
Eric Paris
6
0.08%
1
0.28%
Josh Triplett
6
0.08%
1
0.28%
Jiri Slaby
6
0.08%
1
0.28%
Yoav Zach
5
0.06%
1
0.28%
Neil Horman
5
0.06%
2
0.56%
Konstantin Khlebnikov
5
0.06%
1
0.28%
Mathias Krause
5
0.06%
1
0.28%
Balbir Singh
5
0.06%
1
0.28%
Jay Freyensee
5
0.06%
1
0.28%
Jay Lan
5
0.06%
2
0.56%
Thomas Gleixner
4
0.05%
1
0.28%
Robert Love
4
0.05%
1
0.28%
Anton Blanchard
4
0.05%
1
0.28%
David Smith
3
0.04%
1
0.28%
Coly Li
3
0.04%
1
0.28%
Ying Han
3
0.04%
1
0.28%
James Hogan
3
0.04%
1
0.28%
Zou Nan hai
3
0.04%
1
0.28%
Dave Jones
3
0.04%
1
0.28%
Christoph Lameter
3
0.04%
1
0.28%
Xi Wang
3
0.04%
1
0.28%
Eric Sesterhenn / Snakebyte
3
0.04%
1
0.28%
Johannes Berg
3
0.04%
1
0.28%
Josef 'Jeff' Sipek
3
0.04%
1
0.28%
Cyrill V. Gorcunov
2
0.03%
1
0.28%
David Woodhouse
2
0.03%
1
0.28%
Michel Lespinasse
2
0.03%
1
0.28%
Yi Zhang
2
0.03%
1
0.28%
Jeff Layton
2
0.03%
1
0.28%
Rusty Russell
2
0.03%
1
0.28%
Prasanna Meda
1
0.01%
1
0.28%
Oliver Neukum
1
0.01%
1
0.28%
Yuanhan Liu
1
0.01%
1
0.28%
Namhyung Kim
1
0.01%
1
0.28%
Davide Libenzi
1
0.01%
1
0.28%
Jason Baron
1
0.01%
1
0.28%
Adrian Bunk
1
0.01%
1
0.28%
Benjamin LaHaise
1
0.01%
1
0.28%
Total
7700
100.00%
358
100.00%
Directory: fs

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