From: Alistair Delva <adelva@google.com>
To: linux-kernel@vger.kernel.org
Cc: Khazhismel Kumykov <khazhy@google.com>,
Bart Van Assche <bvanassche@acm.org>,
Serge Hallyn <serge@hallyn.com>, Jens Axboe <axboe@kernel.dk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Paul Moore <paul@paul-moore.com>,
selinux@vger.kernel.org, linux-security-module@vger.kernel.org,
kernel-team@android.com, stable@vger.kernel.org
Subject: [PATCH] block: Check ADMIN before NICE for IOPRIO_CLASS_RT
Date: Mon, 15 Nov 2021 17:38:50 +0000 [thread overview]
Message-ID: <20211115173850.3598768-1-adelva@google.com> (raw)
Booting to Android userspace on 5.14 or newer triggers the following
SELinux denial:
avc: denied { sys_nice } for comm="init" capability=23
scontext=u:r:init:s0 tcontext=u:r:init:s0 tclass=capability
permissive=0
Init is PID 0 running as root, so it already has CAP_SYS_ADMIN. For
better compatibility with older SEPolicy, check ADMIN before NICE.
Fixes: 9d3a39a5f1e4 ("block: grant IOPRIO_CLASS_RT to CAP_SYS_NICE")
Signed-off-by: Alistair Delva <adelva@google.com>
Cc: Khazhismel Kumykov <khazhy@google.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: selinux@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Cc: kernel-team@android.com
Cc: stable@vger.kernel.org # v5.14+
---
block/ioprio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/ioprio.c b/block/ioprio.c
index 0e4ff245f2bf..4d59c559e057 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_NICE) && !capable(CAP_SYS_ADMIN))
+ if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE))
return -EPERM;
fallthrough;
/* rt has prio field too */
--
2.34.0.rc1.387.gb447b232ab-goog
next reply other threads:[~2021-11-15 20:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-15 17:38 Alistair Delva [this message]
2021-11-15 18:04 ` [PATCH] block: Check ADMIN before NICE for IOPRIO_CLASS_RT Jens Axboe
2021-11-15 18:17 ` Alistair Delva
2021-11-15 19:04 ` Ondrej Mosnacek
2021-11-15 19:08 ` Alistair Delva
2021-11-15 21:01 ` Dominick Grift
2021-11-15 21:42 ` Casey Schaufler
2021-11-16 8:21 ` Greg Kroah-Hartman
2021-11-16 9:30 ` David Laight
2021-11-16 13:36 ` Serge E. Hallyn
2021-11-15 19:31 ` Greg Kroah-Hartman
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