lkml.org 
[lkml]   [2004]   [May]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [patch] really-ptrace-single-step
From
Date
It would not work against 2.6.5, since

do_syscall_trace()

makes the check

if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;

Simply removing it would do?



On Tue, 2004-05-11 at 14:12, Davide Libenzi wrote:
> This patch lets a ptrace process on x86 to "see" the instruction
> following the INT #80h op.
>
>
>
> - Davide
>
>
> arch/i386/kernel/entry.S | 2 +-
> include/asm-i386/thread_info.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
>
>
>
> Index: arch/i386/kernel/entry.S
> ===================================================================
> RCS file: /usr/src/bkcvs/linux-2.5/arch/i386/kernel/entry.S,v
> retrieving revision 1.83
> diff -u -r1.83 entry.S
> --- arch/i386/kernel/entry.S 12 Apr 2004 20:29:12 -0000 1.83
> +++ arch/i386/kernel/entry.S 11 May 2004 06:35:29 -0000
> @@ -354,7 +354,7 @@
> # perform syscall exit tracing
> ALIGN
> syscall_exit_work:
> - testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT), %cl
> + testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
> jz work_pending
> sti # could let do_syscall_trace() call
> # schedule() instead
> Index: include/asm-i386/thread_info.h
> ===================================================================
> RCS file: /usr/src/bkcvs/linux-2.5/include/asm-i386/thread_info.h,v
> retrieving revision 1.19
> diff -u -r1.19 thread_info.h
> --- include/asm-i386/thread_info.h 12 Apr 2004 20:29:12 -0000 1.19
> +++ include/asm-i386/thread_info.h 11 May 2004 06:34:47 -0000
> @@ -165,7 +165,7 @@
>
> /* work to do on interrupt/exception return */
> #define _TIF_WORK_MASK \
> - (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
> + (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP))
> #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
>
> /*
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:03    [from the cache]
©2003-2011 Jasper Spaans