Contributors: 35
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Rusty Russell |
95 |
19.92% |
7 |
11.67% |
| Steven Rostedt |
54 |
11.32% |
3 |
5.00% |
| Linus Torvalds |
45 |
9.43% |
5 |
8.33% |
| Sergey Senozhatsky |
37 |
7.76% |
1 |
1.67% |
| Arjan van de Ven |
28 |
5.87% |
1 |
1.67% |
| James Bottomley |
26 |
5.45% |
2 |
3.33% |
| Linus Torvalds (pre-git) |
22 |
4.61% |
5 |
8.33% |
| Ingo Molnar |
17 |
3.56% |
2 |
3.33% |
| Masami Hiramatsu |
16 |
3.35% |
1 |
1.67% |
| Paul Mackerras |
14 |
2.94% |
1 |
1.67% |
| Andrew Morton |
13 |
2.73% |
1 |
1.67% |
| Christophe Leroy |
12 |
2.52% |
5 |
8.33% |
| Daniel Borkmann |
12 |
2.52% |
1 |
1.67% |
| Alexei Starovoitov |
12 |
2.52% |
1 |
1.67% |
| David Daney |
11 |
2.31% |
1 |
1.67% |
| Santosh Sivaraj |
10 |
2.10% |
1 |
1.67% |
| Borislav Petkov |
7 |
1.47% |
1 |
1.67% |
| Frédéric Weisbecker |
6 |
1.26% |
2 |
3.33% |
| Mathieu Desnoyers |
5 |
1.05% |
1 |
1.67% |
| Kefeng Wang |
5 |
1.05% |
2 |
3.33% |
| Uwe Kleine-König |
4 |
0.84% |
1 |
1.67% |
| Dan Aloni |
3 |
0.63% |
1 |
1.67% |
| Thomas Gleixner |
3 |
0.63% |
2 |
3.33% |
| Prasanna S. Panchamukhi |
3 |
0.63% |
1 |
1.67% |
| Christoph Hellwig |
3 |
0.63% |
1 |
1.67% |
| Anton Blanchard |
3 |
0.63% |
1 |
1.67% |
| Kyle McMartin |
2 |
0.42% |
1 |
1.67% |
| Nathan Chancellor |
2 |
0.42% |
1 |
1.67% |
| Dmitri Vorobiev |
1 |
0.21% |
1 |
1.67% |
| Thomas Meyer |
1 |
0.21% |
1 |
1.67% |
| Paul Gortmaker |
1 |
0.21% |
1 |
1.67% |
| Marcin Nowakowski |
1 |
0.21% |
1 |
1.67% |
| Zhou Chengming |
1 |
0.21% |
1 |
1.67% |
| Jiri Olsa |
1 |
0.21% |
1 |
1.67% |
| Andi Kleen |
1 |
0.21% |
1 |
1.67% |
| Total |
477 |
|
60 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/* Rewritten by Rusty Russell, on the backs of many others...
Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
*/
#include <linux/elf.h>
#include <linux/ftrace.h>
#include <linux/memory.h>
#include <linux/extable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/kprobes.h>
#include <linux/filter.h>
#include <asm/sections.h>
#include <linux/uaccess.h>
/*
* mutex protecting text section modification (dynamic code patching).
* some users need to sleep (allocating memory...) while they hold this lock.
*
* Note: Also protects SMP-alternatives modification on x86.
*
* NOT exported to modules - patching kernel text is a really delicate matter.
*/
DEFINE_MUTEX(text_mutex);
extern struct exception_table_entry __start___ex_table[];
extern struct exception_table_entry __stop___ex_table[];
/* Cleared by build time tools if the table is already sorted. */
u32 __initdata __visible main_extable_sort_needed = 1;
/* Sort the kernel's built-in exception table */
void __init sort_main_extable(void)
{
if (main_extable_sort_needed &&
&__stop___ex_table > &__start___ex_table) {
pr_notice("Sorting __ex_table...\n");
sort_extable(__start___ex_table, __stop___ex_table);
}
}
/* Given an address, look for it in the kernel exception table */
const
struct exception_table_entry *search_kernel_exception_table(unsigned long addr)
{
return search_extable(__start___ex_table,
__stop___ex_table - __start___ex_table, addr);
}
/* Given an address, look for it in the exception tables. */
const struct exception_table_entry *search_exception_tables(unsigned long addr)
{
const struct exception_table_entry *e;
e = search_kernel_exception_table(addr);
if (!e)
e = search_module_extables(addr);
if (!e)
e = search_bpf_extables(addr);
return e;
}
int notrace core_kernel_text(unsigned long addr)
{
if (is_kernel_text(addr))
return 1;
if (system_state < SYSTEM_FREEING_INITMEM &&
is_kernel_inittext(addr))
return 1;
return 0;
}
int __kernel_text_address(unsigned long addr)
{
if (kernel_text_address(addr))
return 1;
/*
* There might be init symbols in saved stacktraces.
* Give those symbols a chance to be printed in
* backtraces (such as lockdep traces).
*
* Since we are after the module-symbols check, there's
* no danger of address overlap:
*/
if (is_kernel_inittext(addr))
return 1;
return 0;
}
int kernel_text_address(unsigned long addr)
{
bool no_rcu;
int ret = 1;
if (core_kernel_text(addr))
return 1;
/*
* If a stack dump happens while RCU is not watching, then
* RCU needs to be notified that it requires to start
* watching again. This can happen either by tracing that
* triggers a stack trace, or a WARN() that happens during
* coming back from idle, or cpu on or offlining.
*
* is_module_text_address() as well as the kprobe slots,
* is_bpf_text_address() and is_bpf_image_address require
* RCU to be watching.
*/
no_rcu = !rcu_is_watching();
/* Treat this like an NMI as it can happen anywhere */
if (no_rcu)
ct_nmi_enter();
if (is_module_text_address(addr))
goto out;
if (is_ftrace_trampoline(addr))
goto out;
if (is_kprobe_optinsn_slot(addr) || is_kprobe_insn_slot(addr))
goto out;
if (is_bpf_text_address(addr))
goto out;
ret = 0;
out:
if (no_rcu)
ct_nmi_exit();
return ret;
}
/*
* On some architectures (PPC64, IA64, PARISC) function pointers
* are actually only tokens to some data that then holds the
* real function address. As a result, to find if a function
* pointer is part of the kernel text, we need to do some
* special dereferencing first.
*/
#ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
void *dereference_function_descriptor(void *ptr)
{
func_desc_t *desc = ptr;
void *p;
if (!get_kernel_nofault(p, (void *)&desc->addr))
ptr = p;
return ptr;
}
EXPORT_SYMBOL_GPL(dereference_function_descriptor);
void *dereference_kernel_function_descriptor(void *ptr)
{
if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
return ptr;
return dereference_function_descriptor(ptr);
}
#endif
int func_ptr_is_kernel_text(void *ptr)
{
unsigned long addr;
addr = (unsigned long) dereference_function_descriptor(ptr);
if (core_kernel_text(addr))
return 1;
return is_module_text_address(addr);
}