| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Lorenzo Stoakes | 4554 | 95.15% | 21 | 39.62% |
| Suren Baghdasaryan | 115 | 2.40% | 7 | 13.21% |
| Andrea Arcangeli | 17 | 0.36% | 1 | 1.89% |
| Thomas Hellstrom | 15 | 0.31% | 2 | 3.77% |
| Jann Horn | 14 | 0.29% | 1 | 1.89% |
| David Howells | 12 | 0.25% | 2 | 3.77% |
| Peter Xu | 12 | 0.25% | 1 | 1.89% |
| Linus Torvalds (pre-git) | 9 | 0.19% | 3 | 5.66% |
| Liam R. Howlett | 8 | 0.17% | 2 | 3.77% |
| Matthew Wilcox | 8 | 0.17% | 3 | 5.66% |
| Mel Gorman | 5 | 0.10% | 1 | 1.89% |
| Alan Cox | 5 | 0.10% | 1 | 1.89% |
| Andrew Morton | 4 | 0.08% | 2 | 3.77% |
| ZhangPeng | 2 | 0.04% | 1 | 1.89% |
| Pedro Falcato | 2 | 0.04% | 1 | 1.89% |
| Yajun Deng | 1 | 0.02% | 1 | 1.89% |
| Linus Torvalds | 1 | 0.02% | 1 | 1.89% |
| Hugh Dickins | 1 | 0.02% | 1 | 1.89% |
| Al Viro | 1 | 0.02% | 1 | 1.89% |
| Total | 4786 | 53 |
/* SPDX-License-Identifier: GPL-2.0+ */ /* * vma_internal.h * * Header providing userland wrappers and shims for the functionality provided * by mm/vma_internal.h. * * We make the header guard the same as mm/vma_internal.h, so if this shim * header is included, it precludes the inclusion of the kernel one. */ #ifndef __MM_VMA_INTERNAL_H #define __MM_VMA_INTERNAL_H #define __private #define __bitwise #define __randomize_layout #define CONFIG_MMU #define CONFIG_PER_VMA_LOCK #include <stdlib.h> #include <linux/list.h> #include <linux/maple_tree.h> #include <linux/mm.h> #include <linux/rbtree.h> #include <linux/refcount.h> extern unsigned long stack_guard_gap; #ifdef CONFIG_MMU extern unsigned long mmap_min_addr; extern unsigned long dac_mmap_min_addr; #else #define mmap_min_addr 0UL #define dac_mmap_min_addr 0UL #endif #define VM_WARN_ON(_expr) (WARN_ON(_expr)) #define VM_WARN_ON_ONCE(_expr) (WARN_ON_ONCE(_expr)) #define VM_WARN_ON_VMG(_expr, _vmg) (WARN_ON(_expr)) #define VM_BUG_ON(_expr) (BUG_ON(_expr)) #define VM_BUG_ON_VMA(_expr, _vma) (BUG_ON(_expr)) #define MMF_HAS_MDWE 28 #define VM_NONE 0x00000000 #define VM_READ 0x00000001 #define VM_WRITE 0x00000002 #define VM_EXEC 0x00000004 #define VM_SHARED 0x00000008 #define VM_MAYREAD 0x00000010 #define VM_MAYWRITE 0x00000020 #define VM_MAYEXEC 0x00000040 #define VM_GROWSDOWN 0x00000100 #define VM_PFNMAP 0x00000400 #define VM_LOCKED 0x00002000 #define VM_IO 0x00004000 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ #define VM_DONTEXPAND 0x00040000 #define VM_LOCKONFAULT 0x00080000 #define VM_ACCOUNT 0x00100000 #define VM_NORESERVE 0x00200000 #define VM_MIXEDMAP 0x10000000 #define VM_STACK VM_GROWSDOWN #define VM_SHADOW_STACK VM_NONE #define VM_SOFTDIRTY 0 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ #define VM_GROWSUP VM_NONE #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) #ifdef CONFIG_STACK_GROWSUP #define VM_STACK VM_GROWSUP #define VM_STACK_EARLY VM_GROWSDOWN #else #define VM_STACK VM_GROWSDOWN #define VM_STACK_EARLY 0 #endif #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE) #define TASK_SIZE_LOW DEFAULT_MAP_WINDOW #define TASK_SIZE_MAX DEFAULT_MAP_WINDOW #define STACK_TOP TASK_SIZE_LOW #define STACK_TOP_MAX TASK_SIZE_MAX /* This mask represents all the VMA flag bits used by mlock */ #define VM_LOCKED_MASK (VM_LOCKED | VM_LOCKONFAULT) #define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) #define VM_DATA_FLAGS_TSK_EXEC (VM_READ | VM_WRITE | TASK_EXEC | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC #define VM_STARTGAP_FLAGS (VM_GROWSDOWN | VM_SHADOW_STACK) #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ | VM_STACK_EARLY) #define RLIMIT_STACK 3 /* max stack size */ #define RLIMIT_MEMLOCK 8 /* max locked-in-memory address space */ #define CAP_IPC_LOCK 14 #ifdef CONFIG_64BIT /* VM is sealed, in vm_flags */ #define VM_SEALED _BITUL(63) #endif #define FIRST_USER_ADDRESS 0UL #define USER_PGTABLES_CEILING 0UL #define vma_policy(vma) NULL #define down_write_nest_lock(sem, nest_lock) #define pgprot_val(x) ((x).pgprot) #define __pgprot(x) ((pgprot_t) { (x) } ) #define for_each_vma(__vmi, __vma) \ while (((__vma) = vma_next(&(__vmi))) != NULL) /* The MM code likes to work with exclusive end addresses */ #define for_each_vma_range(__vmi, __vma, __end) \ while (((__vma) = vma_find(&(__vmi), (__end))) != NULL) #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) #define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) #define test_and_set_bit(nr, addr) __test_and_set_bit(nr, addr) #define test_and_clear_bit(nr, addr) __test_and_clear_bit(nr, addr) #define TASK_SIZE ((1ul << 47)-PAGE_SIZE) #define AS_MM_ALL_LOCKS 2 /* We hardcode this for now. */ #define sysctl_max_map_count 0x1000000UL #define pgoff_t unsigned long typedef unsigned long pgprotval_t; typedef struct pgprot { pgprotval_t pgprot; } pgprot_t; typedef unsigned long vm_flags_t; typedef __bitwise unsigned int vm_fault_t; /* * The shared stubs do not implement this, it amounts to an fprintf(STDERR,...) * either way :) */ #define pr_warn_once pr_err #define data_race(expr) expr #define ASSERT_EXCLUSIVE_WRITER(x) /** * swap - swap values of @a and @b * @a: first value * @b: second value */ #define swap(a, b) \ do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) struct kref { refcount_t refcount; }; /* * Define the task command name length as enum, then it can be visible to * BPF programs. */ enum { TASK_COMM_LEN = 16, }; /* * Flags for bug emulation. * * These occupy the top three bytes. */ enum { READ_IMPLIES_EXEC = 0x0400000, }; struct task_struct { char comm[TASK_COMM_LEN]; pid_t pid; struct mm_struct *mm; /* Used for emulating ABI behavior of previous Linux versions: */ unsigned int personality; }; struct task_struct *get_current(void); #define current get_current() struct anon_vma { struct anon_vma *root; struct rb_root_cached rb_root; /* Test fields. */ bool was_cloned; bool was_unlinked; }; struct anon_vma_chain { struct anon_vma *anon_vma; struct list_head same_vma; }; struct anon_vma_name { struct kref kref; /* The name needs to be at the end because it is dynamically sized. */ char name[]; }; struct vma_iterator { struct ma_state mas; }; #define VMA_ITERATOR(name, __mm, __addr) \ struct vma_iterator name = { \ .mas = { \ .tree = &(__mm)->mm_mt, \ .index = __addr, \ .node = NULL, \ .status = ma_start, \ }, \ } struct address_space { struct rb_root_cached i_mmap; unsigned long flags; atomic_t i_mmap_writable; }; struct vm_userfaultfd_ctx {}; struct mempolicy {}; struct mmu_gather {}; struct mutex {}; #define DEFINE_MUTEX(mutexname) \ struct mutex mutexname = {} struct mm_struct { struct maple_tree mm_mt; int map_count; /* number of VMAs */ unsigned long total_vm; /* Total pages mapped */ unsigned long locked_vm; /* Pages that have PG_mlocked set */ unsigned long data_vm; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */ unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */ unsigned long stack_vm; /* VM_STACK */ unsigned long def_flags; unsigned long flags; /* Must use atomic bitops to access */ }; struct vm_area_struct; /* * Describes a VMA that is about to be mmap()'ed. Drivers may choose to * manipulate mutable fields which will cause those fields to be updated in the * resultant VMA. * * Helper functions are not required for manipulating any field. */ struct vm_area_desc { /* Immutable state. */ struct mm_struct *mm; unsigned long start; unsigned long end; /* Mutable fields. Populated with initial state. */ pgoff_t pgoff; struct file *file; vm_flags_t vm_flags; pgprot_t page_prot; /* Write-only fields. */ const struct vm_operations_struct *vm_ops; void *private_data; }; struct file_operations { int (*mmap)(struct file *, struct vm_area_struct *); int (*mmap_prepare)(struct vm_area_desc *); }; struct file { struct address_space *f_mapping; const struct file_operations *f_op; }; #define VMA_LOCK_OFFSET 0x40000000 typedef struct { unsigned long v; } freeptr_t; struct vm_area_struct { /* The first cache line has the info for VMA tree walking. */ union { struct { /* VMA covers [vm_start; vm_end) addresses within mm */ unsigned long vm_start; unsigned long vm_end; }; freeptr_t vm_freeptr; /* Pointer used by SLAB_TYPESAFE_BY_RCU */ }; struct mm_struct *vm_mm; /* The address space we belong to. */ pgprot_t vm_page_prot; /* Access permissions of this VMA. */ /* * Flags, see mm.h. * To modify use vm_flags_{init|reset|set|clear|mod} functions. */ union { const vm_flags_t vm_flags; vm_flags_t __private __vm_flags; }; #ifdef CONFIG_PER_VMA_LOCK /* * Can only be written (using WRITE_ONCE()) while holding both: * - mmap_lock (in write mode) * - vm_refcnt bit at VMA_LOCK_OFFSET is set * Can be read reliably while holding one of: * - mmap_lock (in read or write mode) * - vm_refcnt bit at VMA_LOCK_OFFSET is set or vm_refcnt > 1 * Can be read unreliably (using READ_ONCE()) for pessimistic bailout * while holding nothing (except RCU to keep the VMA struct allocated). * * This sequence counter is explicitly allowed to overflow; sequence * counter reuse can only lead to occasional unnecessary use of the * slowpath. */ unsigned int vm_lock_seq; #endif /* * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma * list, after a COW of one of the file pages. A MAP_SHARED vma * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack * or brk vma (with NULL file) can only be in an anon_vma list. */ struct list_head anon_vma_chain; /* Serialized by mmap_lock & * page_table_lock */ struct anon_vma *anon_vma; /* Serialized by page_table_lock */ /* Function pointers to deal with this struct. */ const struct vm_operations_struct *vm_ops; /* Information about our backing store: */ unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE units */ struct file * vm_file; /* File we map to (can be NULL). */ void * vm_private_data; /* was vm_pte (shared mem) */ #ifdef CONFIG_SWAP atomic_long_t swap_readahead_info; #endif #ifndef CONFIG_MMU struct vm_region *vm_region; /* NOMMU mapping region */ #endif #ifdef CONFIG_NUMA struct mempolicy *vm_policy; /* NUMA policy for the VMA */ #endif #ifdef CONFIG_NUMA_BALANCING struct vma_numab_state *numab_state; /* NUMA Balancing state */ #endif #ifdef CONFIG_PER_VMA_LOCK /* Unstable RCU readers are allowed to read this. */ refcount_t vm_refcnt; #endif /* * For areas with an address space and backing store, * linkage into the address_space->i_mmap interval tree. * */ struct { struct rb_node rb; unsigned long rb_subtree_last; } shared; #ifdef CONFIG_ANON_VMA_NAME /* * For private and shared anonymous mappings, a pointer to a null * terminated string containing the name given to the vma, or NULL if * unnamed. Serialized by mmap_lock. Use anon_vma_name to access. */ struct anon_vma_name *anon_name; #endif struct vm_userfaultfd_ctx vm_userfaultfd_ctx; } __randomize_layout; struct vm_fault {}; struct vm_operations_struct { void (*open)(struct vm_area_struct * area); /** * @close: Called when the VMA is being removed from the MM. * Context: User context. May sleep. Caller holds mmap_lock. */ void (*close)(struct vm_area_struct * area); /* Called any time before splitting to check if it's allowed */ int (*may_split)(struct vm_area_struct *area, unsigned long addr); int (*mremap)(struct vm_area_struct *area); /* * Called by mprotect() to make driver-specific permission * checks before mprotect() is finalised. The VMA must not * be modified. Returns 0 if mprotect() can proceed. */ int (*mprotect)(struct vm_area_struct *vma, unsigned long start, unsigned long end, unsigned long newflags); vm_fault_t (*fault)(struct vm_fault *vmf); vm_fault_t (*huge_fault)(struct vm_fault *vmf, unsigned int order); vm_fault_t (*map_pages)(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff); unsigned long (*pagesize)(struct vm_area_struct * area); /* notification that a previously read-only page is about to become * writable, if an error is returned it will cause a SIGBUS */ vm_fault_t (*page_mkwrite)(struct vm_fault *vmf); /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf); /* called by access_process_vm when get_user_pages() fails, typically * for use by special VMAs. See also generic_access_phys() for a generic * implementation useful for any iomem mapping. */ int (*access)(struct vm_area_struct *vma, unsigned long addr, void *buf, int len, int write); /* Called by the /proc/PID/maps code to ask the vma whether it * has a special name. Returning non-NULL will also cause this * vma to be dumped unconditionally. */ const char *(*name)(struct vm_area_struct *vma); #ifdef CONFIG_NUMA /* * set_policy() op must add a reference to any non-NULL @new mempolicy * to hold the policy upon return. Caller should pass NULL @new to * remove a policy and fall back to surrounding context--i.e. do not * install a MPOL_DEFAULT policy, nor the task or system default * mempolicy. */ int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); /* * get_policy() op must add reference [mpol_get()] to any policy at * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure * in mm/mempolicy.c will do this automatically. * get_policy() must NOT add a ref if the policy at (vma,addr) is not * marked as MPOL_SHARED. vma policies are protected by the mmap_lock. * If no [shared/vma] mempolicy exists at the addr, get_policy() op * must return NULL--i.e., do not "fallback" to task or system default * policy. */ struct mempolicy *(*get_policy)(struct vm_area_struct *vma, unsigned long addr, pgoff_t *ilx); #endif /* * Called by vm_normal_page() for special PTEs to find the * page for @addr. This is useful if the default behavior * (using pte_page()) would not find the correct page. */ struct page *(*find_special_page)(struct vm_area_struct *vma, unsigned long addr); }; struct vm_unmapped_area_info { #define VM_UNMAPPED_AREA_TOPDOWN 1 unsigned long flags; unsigned long length; unsigned long low_limit; unsigned long high_limit; unsigned long align_mask; unsigned long align_offset; unsigned long start_gap; }; struct pagetable_move_control { struct vm_area_struct *old; /* Source VMA. */ struct vm_area_struct *new; /* Destination VMA. */ unsigned long old_addr; /* Address from which the move begins. */ unsigned long old_end; /* Exclusive address at which old range ends. */ unsigned long new_addr; /* Address to move page tables to. */ unsigned long len_in; /* Bytes to remap specified by user. */ bool need_rmap_locks; /* Do rmap locks need to be taken? */ bool for_stack; /* Is this an early temp stack being moved? */ }; #define PAGETABLE_MOVE(name, old_, new_, old_addr_, new_addr_, len_) \ struct pagetable_move_control name = { \ .old = old_, \ .new = new_, \ .old_addr = old_addr_, \ .old_end = (old_addr_) + (len_), \ .new_addr = new_addr_, \ .len_in = len_, \ } struct kmem_cache_args { /** * @align: The required alignment for the objects. * * %0 means no specific alignment is requested. */ unsigned int align; /** * @useroffset: Usercopy region offset. * * %0 is a valid offset, when @usersize is non-%0 */ unsigned int useroffset; /** * @usersize: Usercopy region size. * * %0 means no usercopy region is specified. */ unsigned int usersize; /** * @freeptr_offset: Custom offset for the free pointer * in &SLAB_TYPESAFE_BY_RCU caches * * By default &SLAB_TYPESAFE_BY_RCU caches place the free pointer * outside of the object. This might cause the object to grow in size. * Cache creators that have a reason to avoid this can specify a custom * free pointer offset in their struct where the free pointer will be * placed. * * Note that placing the free pointer inside the object requires the * caller to ensure that no fields are invalidated that are required to * guard against object recycling (See &SLAB_TYPESAFE_BY_RCU for * details). * * Using %0 as a value for @freeptr_offset is valid. If @freeptr_offset * is specified, %use_freeptr_offset must be set %true. * * Note that @ctor currently isn't supported with custom free pointers * as a @ctor requires an external free pointer. */ unsigned int freeptr_offset; /** * @use_freeptr_offset: Whether a @freeptr_offset is used. */ bool use_freeptr_offset; /** * @ctor: A constructor for the objects. * * The constructor is invoked for each object in a newly allocated slab * page. It is the cache user's responsibility to free object in the * same state as after calling the constructor, or deal appropriately * with any differences between a freshly constructed and a reallocated * object. * * %NULL means no constructor. */ void (*ctor)(void *); }; static inline void vma_iter_invalidate(struct vma_iterator *vmi) { mas_pause(&vmi->mas); } static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) { return __pgprot(pgprot_val(oldprot) | pgprot_val(newprot)); } static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) { return __pgprot(vm_flags); } static inline bool is_shared_maywrite(vm_flags_t vm_flags) { return (vm_flags & (VM_SHARED | VM_MAYWRITE)) == (VM_SHARED | VM_MAYWRITE); } static inline bool vma_is_shared_maywrite(struct vm_area_struct *vma) { return is_shared_maywrite(vma->vm_flags); } static inline struct vm_area_struct *vma_next(struct vma_iterator *vmi) { /* * Uses mas_find() to get the first VMA when the iterator starts. * Calling mas_next() could skip the first entry. */ return mas_find(&vmi->mas, ULONG_MAX); } /* * WARNING: to avoid racing with vma_mark_attached()/vma_mark_detached(), these * assertions should be made either under mmap_write_lock or when the object * has been isolated under mmap_write_lock, ensuring no competing writers. */ static inline void vma_assert_attached(struct vm_area_struct *vma) { WARN_ON_ONCE(!refcount_read(&vma->vm_refcnt)); } static inline void vma_assert_detached(struct vm_area_struct *vma) { WARN_ON_ONCE(refcount_read(&vma->vm_refcnt)); } static inline void vma_assert_write_locked(struct vm_area_struct *); static inline void vma_mark_attached(struct vm_area_struct *vma) { vma_assert_write_locked(vma); vma_assert_detached(vma); refcount_set_release(&vma->vm_refcnt, 1); } static inline void vma_mark_detached(struct vm_area_struct *vma) { vma_assert_write_locked(vma); vma_assert_attached(vma); /* We are the only writer, so no need to use vma_refcount_put(). */ if (unlikely(!refcount_dec_and_test(&vma->vm_refcnt))) { /* * Reader must have temporarily raised vm_refcnt but it will * drop it without using the vma since vma is write-locked. */ } } extern const struct vm_operations_struct vma_dummy_vm_ops; extern unsigned long rlimit(unsigned int limit); static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) { memset(vma, 0, sizeof(*vma)); vma->vm_mm = mm; vma->vm_ops = &vma_dummy_vm_ops; INIT_LIST_HEAD(&vma->anon_vma_chain); vma->vm_lock_seq = UINT_MAX; } struct kmem_cache { const char *name; size_t object_size; struct kmem_cache_args *args; }; static inline struct kmem_cache *__kmem_cache_create(const char *name, size_t object_size, struct kmem_cache_args *args) { struct kmem_cache *ret = malloc(sizeof(struct kmem_cache)); ret->name = name; ret->object_size = object_size; ret->args = args; return ret; } #define kmem_cache_create(__name, __object_size, __args, ...) \ __kmem_cache_create((__name), (__object_size), (__args)) static inline void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) { (void)gfpflags; return calloc(s->object_size, 1); } static inline void kmem_cache_free(struct kmem_cache *s, void *x) { free(x); } /* * These are defined in vma.h, but sadly vm_stat_account() is referenced by * kernel/fork.c, so we have to these broadly available there, and temporarily * define them here to resolve the dependency cycle. */ #define is_exec_mapping(flags) \ ((flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC) #define is_stack_mapping(flags) \ (((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK)) #define is_data_mapping(flags) \ ((flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE) static inline void vm_stat_account(struct mm_struct *mm, vm_flags_t flags, long npages) { WRITE_ONCE(mm->total_vm, READ_ONCE(mm->total_vm)+npages); if (is_exec_mapping(flags)) mm->exec_vm += npages; else if (is_stack_mapping(flags)) mm->stack_vm += npages; else if (is_data_mapping(flags)) mm->data_vm += npages; } #undef is_exec_mapping #undef is_stack_mapping #undef is_data_mapping /* Currently stubbed but we may later wish to un-stub. */ static inline void vm_acct_memory(long pages); static inline void vm_unacct_memory(long pages) { vm_acct_memory(-pages); } static inline void mapping_allow_writable(struct address_space *mapping) { atomic_inc(&mapping->i_mmap_writable); } static inline void vma_set_range(struct vm_area_struct *vma, unsigned long start, unsigned long end, pgoff_t pgoff) { vma->vm_start = start; vma->vm_end = end; vma->vm_pgoff = pgoff; } static inline struct vm_area_struct *vma_find(struct vma_iterator *vmi, unsigned long max) { return mas_find(&vmi->mas, max - 1); } static inline int vma_iter_clear_gfp(struct vma_iterator *vmi, unsigned long start, unsigned long end, gfp_t gfp) { __mas_set_range(&vmi->mas, start, end - 1); mas_store_gfp(&vmi->mas, NULL, gfp); if (unlikely(mas_is_err(&vmi->mas))) return -ENOMEM; return 0; } static inline void mmap_assert_locked(struct mm_struct *); static inline struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, unsigned long start_addr, unsigned long end_addr) { unsigned long index = start_addr; mmap_assert_locked(mm); return mt_find(&mm->mm_mt, &index, end_addr - 1); } static inline struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr) { return mtree_load(&mm->mm_mt, addr); } static inline struct vm_area_struct *vma_prev(struct vma_iterator *vmi) { return mas_prev(&vmi->mas, 0); } static inline void vma_iter_set(struct vma_iterator *vmi, unsigned long addr) { mas_set(&vmi->mas, addr); } static inline bool vma_is_anonymous(struct vm_area_struct *vma) { return !vma->vm_ops; } /* Defined in vma.h, so temporarily define here to avoid circular dependency. */ #define vma_iter_load(vmi) \ mas_walk(&(vmi)->mas) static inline struct vm_area_struct * find_vma_prev(struct mm_struct *mm, unsigned long addr, struct vm_area_struct **pprev) { struct vm_area_struct *vma; VMA_ITERATOR(vmi, mm, addr); vma = vma_iter_load(&vmi); *pprev = vma_prev(&vmi); if (!vma) vma = vma_next(&vmi); return vma; } #undef vma_iter_load static inline void vma_iter_init(struct vma_iterator *vmi, struct mm_struct *mm, unsigned long addr) { mas_init(&vmi->mas, &mm->mm_mt, addr); } /* Stubbed functions. */ static inline struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma) { return NULL; } static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, struct vm_userfaultfd_ctx vm_ctx) { return true; } static inline bool anon_vma_name_eq(struct anon_vma_name *anon_name1, struct anon_vma_name *anon_name2) { return true; } static inline void might_sleep(void) { } static inline unsigned long vma_pages(struct vm_area_struct *vma) { return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; } static inline void fput(struct file *) { } static inline void mpol_put(struct mempolicy *) { } static inline void lru_add_drain(void) { } static inline void tlb_gather_mmu(struct mmu_gather *, struct mm_struct *) { } static inline void update_hiwater_rss(struct mm_struct *) { } static inline void update_hiwater_vm(struct mm_struct *) { } static inline void unmap_vmas(struct mmu_gather *tlb, struct ma_state *mas, struct vm_area_struct *vma, unsigned long start_addr, unsigned long end_addr, unsigned long tree_end, bool mm_wr_locked) { (void)tlb; (void)mas; (void)vma; (void)start_addr; (void)end_addr; (void)tree_end; (void)mm_wr_locked; } static inline void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, struct vm_area_struct *vma, unsigned long floor, unsigned long ceiling, bool mm_wr_locked) { (void)tlb; (void)mas; (void)vma; (void)floor; (void)ceiling; (void)mm_wr_locked; } static inline void mapping_unmap_writable(struct address_space *) { } static inline void flush_dcache_mmap_lock(struct address_space *) { } static inline void tlb_finish_mmu(struct mmu_gather *) { } static inline struct file *get_file(struct file *f) { return f; } static inline int vma_dup_policy(struct vm_area_struct *, struct vm_area_struct *) { return 0; } static inline int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src) { /* For testing purposes. We indicate that an anon_vma has been cloned. */ if (src->anon_vma != NULL) { dst->anon_vma = src->anon_vma; dst->anon_vma->was_cloned = true; } return 0; } static inline void vma_start_write(struct vm_area_struct *vma) { /* Used to indicate to tests that a write operation has begun. */ vma->vm_lock_seq++; } static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, unsigned long end, struct vm_area_struct *next) { (void)vma; (void)start; (void)end; (void)next; } static inline void hugetlb_split(struct vm_area_struct *, unsigned long) {} static inline void vma_iter_free(struct vma_iterator *vmi) { mas_destroy(&vmi->mas); } static inline struct vm_area_struct *vma_iter_next_range(struct vma_iterator *vmi) { return mas_next_range(&vmi->mas, ULONG_MAX); } static inline void vm_acct_memory(long pages) { } static inline void vma_interval_tree_insert(struct vm_area_struct *, struct rb_root_cached *) { } static inline void vma_interval_tree_remove(struct vm_area_struct *, struct rb_root_cached *) { } static inline void flush_dcache_mmap_unlock(struct address_space *) { } static inline void anon_vma_interval_tree_insert(struct anon_vma_chain*, struct rb_root_cached *) { } static inline void anon_vma_interval_tree_remove(struct anon_vma_chain*, struct rb_root_cached *) { } static inline void uprobe_mmap(struct vm_area_struct *) { } static inline void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end) { (void)vma; (void)start; (void)end; } static inline void i_mmap_lock_write(struct address_space *) { } static inline void anon_vma_lock_write(struct anon_vma *) { } static inline void vma_assert_write_locked(struct vm_area_struct *) { } static inline void unlink_anon_vmas(struct vm_area_struct *vma) { /* For testing purposes, indicate that the anon_vma was unlinked. */ vma->anon_vma->was_unlinked = true; } static inline void anon_vma_unlock_write(struct anon_vma *) { } static inline void i_mmap_unlock_write(struct address_space *) { } static inline void anon_vma_merge(struct vm_area_struct *, struct vm_area_struct *) { } static inline int userfaultfd_unmap_prep(struct vm_area_struct *vma, unsigned long start, unsigned long end, struct list_head *unmaps) { (void)vma; (void)start; (void)end; (void)unmaps; return 0; } static inline void mmap_write_downgrade(struct mm_struct *) { } static inline void mmap_read_unlock(struct mm_struct *) { } static inline void mmap_write_unlock(struct mm_struct *) { } static inline int mmap_write_lock_killable(struct mm_struct *) { return 0; } static inline bool can_modify_mm(struct mm_struct *mm, unsigned long start, unsigned long end) { (void)mm; (void)start; (void)end; return true; } static inline void arch_unmap(struct mm_struct *mm, unsigned long start, unsigned long end) { (void)mm; (void)start; (void)end; } static inline void mmap_assert_locked(struct mm_struct *) { } static inline bool mpol_equal(struct mempolicy *, struct mempolicy *) { return true; } static inline void khugepaged_enter_vma(struct vm_area_struct *vma, unsigned long vm_flags) { (void)vma; (void)vm_flags; } static inline bool mapping_can_writeback(struct address_space *) { return true; } static inline bool is_vm_hugetlb_page(struct vm_area_struct *) { return false; } static inline bool vma_soft_dirty_enabled(struct vm_area_struct *) { return false; } static inline bool userfaultfd_wp(struct vm_area_struct *) { return false; } static inline void mmap_assert_write_locked(struct mm_struct *) { } static inline void mutex_lock(struct mutex *) { } static inline void mutex_unlock(struct mutex *) { } static inline bool mutex_is_locked(struct mutex *) { return true; } static inline bool signal_pending(void *) { return false; } static inline bool is_file_hugepages(struct file *) { return false; } static inline int security_vm_enough_memory_mm(struct mm_struct *, long) { return 0; } static inline bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long) { return true; } static inline void vm_flags_init(struct vm_area_struct *vma, vm_flags_t flags) { vma->__vm_flags = flags; } static inline void vm_flags_set(struct vm_area_struct *vma, vm_flags_t flags) { vma_start_write(vma); vma->__vm_flags |= flags; } static inline void vm_flags_clear(struct vm_area_struct *vma, vm_flags_t flags) { vma_start_write(vma); vma->__vm_flags &= ~flags; } static inline int shmem_zero_setup(struct vm_area_struct *) { return 0; } static inline void vma_set_anonymous(struct vm_area_struct *vma) { vma->vm_ops = NULL; } static inline void ksm_add_vma(struct vm_area_struct *) { } static inline void perf_event_mmap(struct vm_area_struct *) { } static inline bool vma_is_dax(struct vm_area_struct *) { return false; } static inline struct vm_area_struct *get_gate_vma(struct mm_struct *) { return NULL; } bool vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); /* Update vma->vm_page_prot to reflect vma->vm_flags. */ static inline void vma_set_page_prot(struct vm_area_struct *vma) { unsigned long vm_flags = vma->vm_flags; pgprot_t vm_page_prot; /* testing: we inline vm_pgprot_modify() to avoid clash with vma.h. */ vm_page_prot = pgprot_modify(vma->vm_page_prot, vm_get_page_prot(vm_flags)); if (vma_wants_writenotify(vma, vm_page_prot)) { vm_flags &= ~VM_SHARED; /* testing: we inline vm_pgprot_modify() to avoid clash with vma.h. */ vm_page_prot = pgprot_modify(vm_page_prot, vm_get_page_prot(vm_flags)); } /* remove_protection_ptes reads vma->vm_page_prot without mmap_lock */ WRITE_ONCE(vma->vm_page_prot, vm_page_prot); } static inline bool arch_validate_flags(unsigned long) { return true; } static inline void vma_close(struct vm_area_struct *) { } static inline int mmap_file(struct file *, struct vm_area_struct *) { return 0; } static inline unsigned long stack_guard_start_gap(struct vm_area_struct *vma) { if (vma->vm_flags & VM_GROWSDOWN) return stack_guard_gap; /* See reasoning around the VM_SHADOW_STACK definition */ if (vma->vm_flags & VM_SHADOW_STACK) return PAGE_SIZE; return 0; } static inline unsigned long vm_start_gap(struct vm_area_struct *vma) { unsigned long gap = stack_guard_start_gap(vma); unsigned long vm_start = vma->vm_start; vm_start -= gap; if (vm_start > vma->vm_start) vm_start = 0; return vm_start; } static inline unsigned long vm_end_gap(struct vm_area_struct *vma) { unsigned long vm_end = vma->vm_end; if (vma->vm_flags & VM_GROWSUP) { vm_end += stack_guard_gap; if (vm_end < vma->vm_end) vm_end = -PAGE_SIZE; } return vm_end; } static inline int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, unsigned long len) { return 0; } static inline bool vma_is_accessible(struct vm_area_struct *vma) { return vma->vm_flags & VM_ACCESS_FLAGS; } static inline bool capable(int cap) { return true; } static inline bool mlock_future_ok(struct mm_struct *mm, unsigned long flags, unsigned long bytes) { unsigned long locked_pages, limit_pages; if (!(flags & VM_LOCKED) || capable(CAP_IPC_LOCK)) return true; locked_pages = bytes >> PAGE_SHIFT; locked_pages += mm->locked_vm; limit_pages = rlimit(RLIMIT_MEMLOCK); limit_pages >>= PAGE_SHIFT; return locked_pages <= limit_pages; } static inline int __anon_vma_prepare(struct vm_area_struct *vma) { struct anon_vma *anon_vma = calloc(1, sizeof(struct anon_vma)); if (!anon_vma) return -ENOMEM; anon_vma->root = anon_vma; vma->anon_vma = anon_vma; return 0; } static inline int anon_vma_prepare(struct vm_area_struct *vma) { if (likely(vma->anon_vma)) return 0; return __anon_vma_prepare(vma); } static inline void userfaultfd_unmap_complete(struct mm_struct *mm, struct list_head *uf) { } /* * Denies creating a writable executable mapping or gaining executable permissions. * * This denies the following: * * a) mmap(PROT_WRITE | PROT_EXEC) * * b) mmap(PROT_WRITE) * mprotect(PROT_EXEC) * * c) mmap(PROT_WRITE) * mprotect(PROT_READ) * mprotect(PROT_EXEC) * * But allows the following: * * d) mmap(PROT_READ | PROT_EXEC) * mmap(PROT_READ | PROT_EXEC | PROT_BTI) * * This is only applicable if the user has set the Memory-Deny-Write-Execute * (MDWE) protection mask for the current process. * * @old specifies the VMA flags the VMA originally possessed, and @new the ones * we propose to set. * * Return: false if proposed change is OK, true if not ok and should be denied. */ static inline bool map_deny_write_exec(unsigned long old, unsigned long new) { /* If MDWE is disabled, we have nothing to deny. */ if (!test_bit(MMF_HAS_MDWE, ¤t->mm->flags)) return false; /* If the new VMA is not executable, we have nothing to deny. */ if (!(new & VM_EXEC)) return false; /* Under MDWE we do not accept newly writably executable VMAs... */ if (new & VM_WRITE) return true; /* ...nor previously non-executable VMAs becoming executable. */ if (!(old & VM_EXEC)) return true; return false; } static inline int mapping_map_writable(struct address_space *mapping) { int c = atomic_read(&mapping->i_mmap_writable); /* Derived from the raw_atomic_inc_unless_negative() implementation. */ do { if (c < 0) return -EPERM; } while (!__sync_bool_compare_and_swap(&mapping->i_mmap_writable, c, c+1)); return 0; } static inline unsigned long move_page_tables(struct pagetable_move_control *pmc) { (void)pmc; return 0; } static inline void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, unsigned long end, unsigned long floor, unsigned long ceiling) { (void)tlb; (void)addr; (void)end; (void)floor; (void)ceiling; } static inline int ksm_execve(struct mm_struct *mm) { (void)mm; return 0; } static inline void ksm_exit(struct mm_struct *mm) { (void)mm; } static inline void vma_lock_init(struct vm_area_struct *vma, bool reset_refcnt) { (void)vma; (void)reset_refcnt; } static inline void vma_numab_state_init(struct vm_area_struct *vma) { (void)vma; } static inline void vma_numab_state_free(struct vm_area_struct *vma) { (void)vma; } static inline void dup_anon_vma_name(struct vm_area_struct *orig_vma, struct vm_area_struct *new_vma) { (void)orig_vma; (void)new_vma; } static inline void free_anon_vma_name(struct vm_area_struct *vma) { (void)vma; } /* Did the driver provide valid mmap hook configuration? */ static inline bool file_has_valid_mmap_hooks(struct file *file) { bool has_mmap = file->f_op->mmap; bool has_mmap_prepare = file->f_op->mmap_prepare; /* Hooks are mutually exclusive. */ if (WARN_ON_ONCE(has_mmap && has_mmap_prepare)) return false; if (WARN_ON_ONCE(!has_mmap && !has_mmap_prepare)) return false; return true; } static inline int call_mmap(struct file *file, struct vm_area_struct *vma) { if (WARN_ON_ONCE(file->f_op->mmap_prepare)) return -EINVAL; return file->f_op->mmap(file, vma); } static inline int __call_mmap_prepare(struct file *file, struct vm_area_desc *desc) { return file->f_op->mmap_prepare(desc); } static inline void fixup_hugetlb_reservations(struct vm_area_struct *vma) { (void)vma; } static inline void vma_set_file(struct vm_area_struct *vma, struct file *file) { /* Changing an anonymous vma with this is illegal */ get_file(file); swap(vma->vm_file, file); fput(file); } #endif /* __MM_VMA_INTERNAL_H */
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