From 9d3a39a5f1e45827b008fff1ee9cf3cac3409665 Mon Sep 17 00:00:00 2001 From: Khazhismel Kumykov Date: Mon, 24 Aug 2020 15:10:34 -0700 Subject: [PATCH] block: grant IOPRIO_CLASS_RT to CAP_SYS_NICE 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 Reviewed-by: Bart Van Assche Acked-by: Serge Hallyn Signed-off-by: Jens Axboe --- block/ioprio.c | 2 +- include/uapi/linux/capability.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/block/ioprio.c b/block/ioprio.c index 04ebd37966f1..364d2294ba90 100644 --- a/block/ioprio.c +++ b/block/ioprio.c @@ -69,7 +69,7 @@ int ioprio_check_cap(int ioprio) switch (class) { case IOPRIO_CLASS_RT: - if (!capable(CAP_SYS_ADMIN)) + if (!capable(CAP_SYS_NICE) && !capable(CAP_SYS_ADMIN)) return -EPERM; fallthrough; /* rt has prio field too */ diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h index 395dd0df8d08..c6ca33034147 100644 --- a/include/uapi/linux/capability.h +++ b/include/uapi/linux/capability.h @@ -288,6 +288,8 @@ struct vfs_ns_cap_data { processes and setting the scheduling algorithm used by another process. */ /* Allow setting cpu affinity on other processes */ +/* Allow setting realtime ioprio class */ +/* Allow setting ioprio class on other processes */ #define CAP_SYS_NICE 23