3.4-stable review patch. If anyone has any objections, please let me know. ------------------ 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); -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html