mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
f39b6f0ef8
user_mode_vm() and user_mode() are now the same. Change all callers of user_mode_vm() to user_mode(). The next patch will remove the definition of user_mode_vm. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brad Spengler <spender@grsecurity.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/43b1f57f3df70df5a08b0925897c660725015554.1426728647.git.luto@kernel.org [ Merged to a more recent kernel. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/**
|
|
* @file backtrace.c
|
|
*
|
|
* @remark Copyright 2002 OProfile authors
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author John Levon
|
|
* @author David Smith
|
|
*/
|
|
|
|
#include <linux/oprofile.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/stacktrace.h>
|
|
|
|
static int backtrace_stack(void *data, char *name)
|
|
{
|
|
/* Yes, we want all stacks */
|
|
return 0;
|
|
}
|
|
|
|
static void backtrace_address(void *data, unsigned long addr, int reliable)
|
|
{
|
|
unsigned int *depth = data;
|
|
|
|
if ((*depth)--)
|
|
oprofile_add_trace(addr);
|
|
}
|
|
|
|
static struct stacktrace_ops backtrace_ops = {
|
|
.stack = backtrace_stack,
|
|
.address = backtrace_address,
|
|
.walk_stack = print_context_stack,
|
|
};
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static struct stack_frame_ia32 *
|
|
dump_user_backtrace_32(struct stack_frame_ia32 *head)
|
|
{
|
|
/* Also check accessibility of one struct frame_head beyond: */
|
|
struct stack_frame_ia32 bufhead[2];
|
|
struct stack_frame_ia32 *fp;
|
|
unsigned long bytes;
|
|
|
|
bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
|
|
if (bytes != 0)
|
|
return NULL;
|
|
|
|
fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
|
|
|
|
oprofile_add_trace(bufhead[0].return_address);
|
|
|
|
/* frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses) */
|
|
if (head >= fp)
|
|
return NULL;
|
|
|
|
return fp;
|
|
}
|
|
|
|
static inline int
|
|
x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
struct stack_frame_ia32 *head;
|
|
|
|
/* User process is IA32 */
|
|
if (!current || !test_thread_flag(TIF_IA32))
|
|
return 0;
|
|
|
|
head = (struct stack_frame_ia32 *) regs->bp;
|
|
while (depth-- && head)
|
|
head = dump_user_backtrace_32(head);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
static inline int
|
|
x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
|
|
{
|
|
/* Also check accessibility of one struct frame_head beyond: */
|
|
struct stack_frame bufhead[2];
|
|
unsigned long bytes;
|
|
|
|
bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
|
|
if (bytes != 0)
|
|
return NULL;
|
|
|
|
oprofile_add_trace(bufhead[0].return_address);
|
|
|
|
/* frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses) */
|
|
if (head >= bufhead[0].next_frame)
|
|
return NULL;
|
|
|
|
return bufhead[0].next_frame;
|
|
}
|
|
|
|
void
|
|
x86_backtrace(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
|
|
|
|
if (!user_mode(regs)) {
|
|
unsigned long stack = kernel_stack_pointer(regs);
|
|
if (depth)
|
|
dump_trace(NULL, regs, (unsigned long *)stack, 0,
|
|
&backtrace_ops, &depth);
|
|
return;
|
|
}
|
|
|
|
if (x86_backtrace_32(regs, depth))
|
|
return;
|
|
|
|
while (depth-- && head)
|
|
head = dump_user_backtrace(head);
|
|
}
|