On Fri, Nov 9, 2012 at 5:31 AM, Artem Bityutskiy <dedeki...@gmail.com> wrote: > From: Artem Bityutskiy <artem.bityuts...@linux.intel.com> > > We display a list of supplementary group for each process in the > /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.bityuts...@linux.intel.com>
Acked-by: Kees Cook <keesc...@chromium.org> > Cc: sta...@vger.kernel.org > --- > fs/proc/array.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > NOTE: I consider this to be a bug which breaks user-space, so I add -stable. I'm not sure if this will fly since it's been broken for a very long time, but it's a tiny change. -Kees -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
