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From a44f33e5cafc02477c182119ee422ea54eb1f3db Mon Sep 17 00:00:00 2001
From: Eduardo Otubo <otubo@redhat.com>
Date: Fri, 28 Sep 2018 07:56:35 +0100
Subject: [PATCH 1/6] seccomp: allow sched_setscheduler() with SCHED_IDLE
 policy
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RH-Author: Eduardo Otubo <otubo@redhat.com>
Message-id: <20180928075639.16746-2-otubo@redhat.com>
Patchwork-id: 82317
O-Subject: [RHEL-8 qemu-kvm PATCH 1/5] seccomp: allow sched_setscheduler() with SCHED_IDLE policy
Bugzilla: 1618356
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>

From: Marc-André Lureau <marcandre.lureau@redhat.com>

commit 056de1e894155fbb99e7b43c1c4382d4920cf437
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
Date:   Tue Jul 10 16:55:57 2018 +0200

    seccomp: allow sched_setscheduler() with SCHED_IDLE policy

    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>

Signed-by-off: Eduardo Otubo <otubo@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 qemu-seccomp.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/qemu-seccomp.c b/qemu-seccomp.c
index b770a77..845a333 100644
--- a/qemu-seccomp.c
+++ b/qemu-seccomp.c
@@ -29,6 +29,12 @@
 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[] = {
@@ -87,7 +93,8 @@ 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 },
@@ -113,7 +120,8 @@ 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;
         }
-- 
1.8.3.1