This is a note to let you know that I've just added the patch titled
proc: pid/status: show all supplementary groups
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
proc-pid-status-show-all-supplementary-groups.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4efbbb6ce0d1d46e57be495e791c109277f07a14 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
Date: Mon, 17 Dec 2012 16:03:17 -0800
Subject: proc: pid/status: show all supplementary groups
From: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
commit 8d238027b87e654be552eabdf492042a34c5c300 upstream.
We display a list of supplementary group for each process in
/proc/<pid>/status. However, we show only the first 32 groups, not all of
them.
Although this is rare, but sometimes processes do have more than 32
supplementary groups, and this kernel limitation breaks user-space apps
that rely on the group list in /proc/<pid>/status.
Number 32 comes from the internal NGROUPS_SMALL macro which defines the
length for the internal kernel "small" groups buffer. There is no
apparent reason to limit to this value.
This patch removes the 32 groups printing limit.
The Linux kernel limits the amount of supplementary groups by NGROUPS_MAX,
which is currently set to 65536. And this is the maximum count of groups
we may possibly print.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
Acked-by: Serge E. Hallyn <serge.hallyn@xxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Cc: Jianguo Wu <wujianguo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/proc/array.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -204,7 +204,7 @@ static inline void task_state(struct seq
group_info = cred->group_info;
task_unlock(p);
- for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
+ for (g = 0; g < group_info->ngroups; g++)
seq_printf(m, "%d ", GROUP_AT(group_info, g));
put_cred(cred);
Patches currently in stable-queue which might be from artem.bityutskiy@xxxxxxxxxxxxxxx are
queue-3.4/proc-pid-status-show-all-supplementary-groups.patch
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