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[PATCH] nice and rt-prio rlimits

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Add a pair of rlimits for allowing non-root tasks to raise nice and rt
priorities. Defaults to traditional behavior. Originally written by
Chris Wright.

The patch implements a simple rlimit ceiling for the RT (and nice) priorities
a task can set.  The rlimit defaults to 0, meaning no change in behavior by
default.  A value of 50 means RT priority levels 1-50 are allowed.  A value of
100 means all 99 privilege levels from 1 to 99 are allowed.  CAP_SYS_NICE is
blanket permission.

(akpm: see http://www.uwsg.iu.edu/hypermail/linux/kernel/0503.1/1921.html for
tips on integrating this with PAM).

Signed-off-by: Matt Mackall <mpm@selenic.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Matt Mackall
2005-05-01 08:59:00 -07:00
committed by Linus Torvalds
parent 9fc1427a01
commit e43379f10b
4 changed files with 27 additions and 8 deletions
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2
kernel/sys.c
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@@ -227,7 +227,7 @@ static int set_one_prio(struct task_struct *p, int niceval, int error)
error = -EPERM;
goto out;
}
if (niceval < task_nice(p) && !capable(CAP_SYS_NICE)) {
if (niceval < task_nice(p) && !can_nice(p, niceval)) {
error = -EACCES;
goto out;
}