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- Bring the PTRACE_SYSEMU semantics in line with the man page.

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- Annotate variable assignment in get_user() with the type to avoid
   sparse warnings.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Bring the PTRACE_SYSEMU semantics in line with the man page.

 - Annotate variable assignment in get_user() with the type to avoid
   sparse warnings.

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Add get_user() type annotation on the !access_ok() path
  arm64: Fix PTRACE_SYSEMU semantics
This commit is contained in:
Linus Torvalds 2020-05-22 09:34:19 -07:00
commit 4286d192c8
2 changed files with 5 additions and 4 deletions
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2
arch/arm64/include/asm/uaccess.h
View File

@ -304,7 +304,7 @@ do { \
__p = uaccess_mask_ptr(__p); \
__raw_get_user((x), __p, (err)); \
} else { \
(x) = 0; (err) = -EFAULT; \
(x) = (__force __typeof__(x))0; (err) = -EFAULT; \
} \
} while (0)

7
arch/arm64/kernel/ptrace.c
View File

@ -1829,10 +1829,11 @@ static void tracehook_report_syscall(struct pt_regs *regs,
int syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE) ||
test_thread_flag(TIF_SYSCALL_EMU)) {
unsigned long flags = READ_ONCE(current_thread_info()->flags);
if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) {
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
if (!in_syscall(regs) || test_thread_flag(TIF_SYSCALL_EMU))
if (!in_syscall(regs) || (flags & _TIF_SYSCALL_EMU))
return -1;
}