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From a44f33e5cafc02477c182119ee422ea54eb1f3db Mon Sep 17 00:00:00 2001
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From: Eduardo Otubo <otubo@redhat.com>
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Date: Fri, 28 Sep 2018 07:56:35 +0100
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Subject: [PATCH 1/6] seccomp: allow sched_setscheduler() with SCHED_IDLE
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policy
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eduardo Otubo <otubo@redhat.com>
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Message-id: <20180928075639.16746-2-otubo@redhat.com>
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Patchwork-id: 82317
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O-Subject: [RHEL-8 qemu-kvm PATCH 1/5] seccomp: allow sched_setscheduler() with SCHED_IDLE policy
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Bugzilla: 1618356
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Marc-André Lureau <marcandre.lureau@redhat.com>
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commit 056de1e894155fbb99e7b43c1c4382d4920cf437
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Author: Marc-André Lureau <marcandre.lureau@redhat.com>
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Date: Tue Jul 10 16:55:57 2018 +0200
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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
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a thread job queue with low priority, set with
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sched_setscheduler(SCHED_IDLE). However, that syscall is rejected by
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the "resourcecontrol" seccomp qemu filter.
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Since it should be safe to allow lowering thread priority, let's allow
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scheduling thread to idle policy.
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Related to:
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https://bugzilla.redhat.com/show_bug.cgi?id=1594456
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Acked-by: Eduardo Otubo <otubo@redhat.com>
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Signed-by-off: Eduardo Otubo <otubo@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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qemu-seccomp.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/qemu-seccomp.c b/qemu-seccomp.c
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index b770a77..845a333 100644
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--- a/qemu-seccomp.c
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+++ b/qemu-seccomp.c
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@@ -29,6 +29,12 @@
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struct QemuSeccompSyscall {
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int32_t num;
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uint8_t set;
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+ uint8_t narg;
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+ const struct scmp_arg_cmp *arg_cmp;
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+};
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+
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+const struct scmp_arg_cmp sched_setscheduler_arg[] = {
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+ SCMP_A1(SCMP_CMP_NE, SCHED_IDLE)
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};
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static const struct QemuSeccompSyscall blacklist[] = {
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@@ -87,7 +93,8 @@ static const struct QemuSeccompSyscall blacklist[] = {
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{ SCMP_SYS(setpriority), QEMU_SECCOMP_SET_RESOURCECTL },
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{ SCMP_SYS(sched_setparam), QEMU_SECCOMP_SET_RESOURCECTL },
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{ SCMP_SYS(sched_getparam), QEMU_SECCOMP_SET_RESOURCECTL },
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- { SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
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+ { SCMP_SYS(sched_setscheduler), QEMU_SECCOMP_SET_RESOURCECTL,
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+ ARRAY_SIZE(sched_setscheduler_arg), sched_setscheduler_arg },
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{ SCMP_SYS(sched_getscheduler), QEMU_SECCOMP_SET_RESOURCECTL },
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{ SCMP_SYS(sched_setaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
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{ SCMP_SYS(sched_getaffinity), QEMU_SECCOMP_SET_RESOURCECTL },
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@@ -113,7 +120,8 @@ int seccomp_start(uint32_t seccomp_opts)
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continue;
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}
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- rc = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i].num, 0);
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+ rc = seccomp_rule_add_array(ctx, SCMP_ACT_KILL, blacklist[i].num,
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+ blacklist[i].narg, blacklist[i].arg_cmp);
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if (rc < 0) {
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goto seccomp_return;
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}
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--
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1.8.3.1
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