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block: grant IOPRIO_CLASS_RT to CAP_SYS_NICE

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CAP_SYS_ADMIN is too broad, and ionice fits into CAP_SYS_NICE's grouping.

Retain CAP_SYS_ADMIN permission for backwards compatibility.

Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Khazhismel Kumykov 2020-08-24 15:10:34 -07:00 committed by Jens Axboe
parent a7863b3423
commit 9d3a39a5f1
2 changed files with 3 additions and 1 deletions
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2
block/ioprio.c
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@ -69,7 +69,7 @@ int ioprio_check_cap(int ioprio)
switch (class) { switch (class) {
case IOPRIO_CLASS_RT: case IOPRIO_CLASS_RT:
if (!capable(CAP_SYS_ADMIN)) if (!capable(CAP_SYS_NICE) && !capable(CAP_SYS_ADMIN))
return -EPERM; return -EPERM;
fallthrough; fallthrough;
/* rt has prio field too */ /* rt has prio field too */

2
include/uapi/linux/capability.h
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@ -288,6 +288,8 @@ struct vfs_ns_cap_data {
processes and setting the scheduling algorithm used by another processes and setting the scheduling algorithm used by another
process. */ process. */
/* Allow setting cpu affinity on other processes */ /* Allow setting cpu affinity on other processes */
/* Allow setting realtime ioprio class */
/* Allow setting ioprio class on other processes */
#define CAP_SYS_NICE 23 #define CAP_SYS_NICE 23