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prctl: use CAP_SYS_RESOURCE for PR_SET_MM option 

CAP_SYS_ADMIN is already overloaded left and right, so to have more
fine-grained access control use CAP_SYS_RESOURCE here.

The CAP_SYS_RESOUCE is chosen because this prctl option allows a current
process to adjust some fields of memory map descriptor which rather
represents what the process owns: pointers to code, data, stack
segments, command line, auxiliary vector data and etc.

Suggested-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cyrill Gorcunov 2012-03-15 15:17:10 -07:00 committed by Linus Torvalds
parent 9bbad7da76
commit 79f0713d40
1 changed files with 1 additions and 1 deletions
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2
kernel/sys.c
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@ -1706,7 +1706,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
if (arg4 | arg5)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
if (addr >= TASK_SIZE)