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seccomp: allow sched_setscheduler() with SCHED_IDLE policy

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Current and upcoming mesa releases rely on a shader disk cash. It uses
a thread job queue with low priority, set with
sched_setscheduler(SCHED_IDLE). However, that syscall is rejected by
the "resourcecontrol" seccomp qemu filter.

Since it should be safe to allow lowering thread priority, let's allow
scheduling thread to idle policy.

Related to:
https://bugzilla.redhat.com/show_bug.cgi?id=1594456

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Eduardo Otubo <otubo@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-07-10 16:55:57 +02:00 committed by Eduardo Otubo
parent c447afd578
commit 056de1e894
1 changed files with 10 additions and 2 deletions
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12
qemu-seccomp.c
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@ -34,6 +34,12 @@
struct QemuSeccompSyscall {
int32_t num;
uint8_t set;
uint8_t narg;
const struct scmp_arg_cmp *arg_cmp;
};
const struct scmp_arg_cmp sched_setscheduler_arg[] = {
SCMP_A1(SCMP_CMP_NE, SCHED_IDLE)
};
static const struct QemuSeccompSyscall blacklist[] = {
@ -92,7 +98,8 @@ static const struct QemuSeccompSyscall blacklist[] = {
{ SCMP_SYS(setpriority), QEMU_SECCOMP_SET_RESOURCECTL },
{ SCMP_SYS(sched_setparam), QEMU_SECCOMP_SET_RESOURCECTL },
{ SCMP_SYS(sched_getparam), QEMU_SECCOMP_SET_RESOURCECTL },
{ SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
{ SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL,
ARRAY_SIZE(sched_setscheduler_arg), sched_setscheduler_arg },
{ SCMP_SYS(sched_getscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
{ SCMP_SYS(sched_setaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
{ SCMP_SYS(sched_getaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
@ -118,7 +125,8 @@ static int seccomp_start(uint32_t seccomp_opts)
continue;
}
rc = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i].num, 0);
rc = seccomp_rule_add_array(ctx, SCMP_ACT_KILL, blacklist[i].num,
blacklist[i].narg, blacklist[i].arg_cmp);
if (rc < 0) {
goto seccomp_return;
}