[PATCH] kcmp.2: note about SECURITY_YAMA

[PATCH] kcmp.2: note about SECURITY_YAMA

[Shawn Landden]

---
 man2/kcmp.2 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/man2/kcmp.2 b/man2/kcmp.2
index 5cde64e..fcfe711 100644
--- a/man2/kcmp.2
+++ b/man2/kcmp.2
@@ -187,7 +187,12 @@ is invalid.
 Insufficient permission to inspect process resources.
 The
 .B CAP_SYS_PTRACE
-capability is required to inspect processes that you do not own.
+capability is required to inspect processes that you do not own. Other
+limitations on ptrace apply, such as
+.BR CONFIG_SECURITY_YAMA ,
+which when /proc/sys/kernel/yama/ptrace_scope is 2 (the default) limits
+.BR kcmp()
+to child processes.
 .TP
 .B ESRCH
 Process
-- 
1.8.4.4

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Re: [PATCH] kcmp.2: note about SECURITY_YAMA

[Michael Kerrisk (man-pages)]

On 11/28/2013 10:42 PM, Shawn Landden wrote:

Thanks, Shawn.

Applied.

Cheers,

Michael


> ---
>  man2/kcmp.2 | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/man2/kcmp.2 b/man2/kcmp.2
> index 5cde64e..fcfe711 100644
> --- a/man2/kcmp.2
> +++ b/man2/kcmp.2
> @@ -187,7 +187,12 @@ is invalid.
>  Insufficient permission to inspect process resources.
>  The
>  .B CAP_SYS_PTRACE
> -capability is required to inspect processes that you do not own.
> +capability is required to inspect processes that you do not own. Other
> +limitations on ptrace apply, such as
> +.BR CONFIG_SECURITY_YAMA ,
> +which when /proc/sys/kernel/yama/ptrace_scope is 2 (the default) limits
> +.BR kcmp()
> +to child processes.
>  .TP
>  .B ESRCH
>  Process
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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