Hi, libselinux upstream plans to disallow to use getpidcon(0, ) in sense of getpidcon(getpid(), )
This behavior has never been documented and it's implementation is
considered error prone.
There seems to be no such case in Fedora but if your project uses
getpidcon() with pid == 0 to get the context of the current process,
please replace it with getcon().
Thanks,
Petr
-------- Forwarded Message --------
Subject: getpidcon with pid == 0 (Was: Re: [PATCH 2/2] libselinux:
procattr: return einval for <= 0 pid args.)
Date: Wed, 24 Feb 2016 09:49:16 -0500
From: Stephen Smalley <s...@tycho.nsa.gov>
Organization: National Security Agency
To: Daniel Cashman <dcash...@android.com>, seli...@tycho.nsa.gov
On 02/23/2016 03:24 PM, Daniel Cashman wrote:
> From: dcashman <dcash...@android.com>
>
> getpidcon documentation does not specify that a pid of 0 refers to the
> current process, and getcon exists specifically to provide this
> functionality, and getpidcon(getpid()) would provide it as well.
> Disallow pid values <= 0 that may lead to unintended behavior in
> userspace object managers.
I'll try to see if there are any legitimate users of getpidcon with pid
== 0. If anyone on the list knows of one, please speak up.
>
> Signed-off-by: Daniel Cashman <dcash...@android.com>
> ---
> libselinux/src/procattr.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/libselinux/src/procattr.c b/libselinux/src/procattr.c
> index c20f003..eee4612 100644
> --- a/libselinux/src/procattr.c
> +++ b/libselinux/src/procattr.c
> @@ -306,11 +306,21 @@ static int setprocattrcon(const char * context,
> #define getpidattr_def(fn, attr) \
> int get##fn##_raw(pid_t pid, char **c) \
> { \
> - return getprocattrcon_raw(c, pid, #attr); \
> + if (pid <= 0) { \
> + errno = EINVAL; \
> + return -1; \
> + } else { \
> + return getprocattrcon_raw(c, pid, #attr); \
> + } \
> } \
> int get##fn(pid_t pid, char **c) \
> { \
> - return getprocattrcon(c, pid, #attr); \
> + if (pid <= 0) { \
> + errno = EINVAL; \
> + return -1; \
> + } else { \
> + return getprocattrcon(c, pid, #attr); \
> + } \
> }
>
> all_selfattr_def(con, current)
>
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