Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call
From: Dmitry V. Levin
Date: Thu Dec 06 2018 - 20:19:52 EST
On Mon, Dec 03, 2018 at 06:18:23AM +0300, Dmitry V. Levin wrote:
> From: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
>
> Arch code should use tracehook_*() helpers, as documented
> in include/linux/tracehook.h,
> ptrace_report_syscall() is not expected to be used outside that file.
>
> Co-authored-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
> Fixes: 5521eb4bca2d ("powerpc/ptrace: Add support for PTRACE_SYSEMU")
> Signed-off-by: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
> Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
> ---
> v4: rewritten to call tracehook_report_syscall_entry() once, compile-tested
> v3: add a descriptive comment
> v2: explicitly ignore tracehook_report_syscall_entry() return code
>
> arch/powerpc/kernel/ptrace.c | 54 +++++++++++++++++++++++-------------
> 1 file changed, 35 insertions(+), 19 deletions(-)
Sorry, this patch does not work, please ignore it.
However, the bug blocks PTRACE_GET_SYSCALL_INFO, so please fix it.
I'm going to use
if (tracehook_report_syscall_entry(regs))
return -1;
return -1;
in the series until you have a better fix.
--
ldv
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