Backport virtiofsd changes to fix crashes on F36+
Resolves: rhbz#2070066
This commit is contained in:
Neal Gompa
parent
148536a5a4
commit
fdc9ebb862
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From 7b223e38603de3a75602e14914d26f9d4baf52eb Mon Sep 17 00:00:00 2001
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From: Christian Ehrhardt <christian.ehrhardt@canonical.com>
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Date: Wed, 9 Feb 2022 12:14:56 +0100
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Subject: [PATCH 1/2] tools/virtiofsd: Add rseq syscall to the seccomp
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allowlist
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The virtiofsd currently crashes when used with glibc 2.35.
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That is due to the rseq system call being added to every thread
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creation [1][2].
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[1]: https://www.efficios.com/blog/2019/02/08/linux-restartable-sequences/
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[2]: https://sourceware.org/pipermail/libc-alpha/2022-February/136040.html
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This happens not at daemon start, but when a guest connects
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/usr/lib/qemu/virtiofsd -f --socket-path=/tmp/testvfsd -o sandbox=chroot \
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-o source=/var/guests/j-virtiofs --socket-group=kvm
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virtio_session_mount: Waiting for vhost-user socket connection...
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# start ok, now guest will connect
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virtio_session_mount: Received vhost-user socket connection
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virtio_loop: Entry
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fv_queue_set_started: qidx=0 started=1
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fv_queue_set_started: qidx=1 started=1
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Bad system call (core dumped)
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We have to put rseq on the seccomp allowlist to avoid that the daemon
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is crashing in this case.
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Reported-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
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Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: 20220209111456.3328420-1-christian.ehrhardt@canonical.com
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[Moved rseq to its alphabetically ordered position in the seccomp
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allowlist.
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--Stefan]
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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---
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tools/virtiofsd/passthrough_seccomp.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/tools/virtiofsd/passthrough_seccomp.c b/tools/virtiofsd/passthrough_seccomp.c
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index a3ce9f898d..2bc0127b69 100644
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--- a/tools/virtiofsd/passthrough_seccomp.c
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+++ b/tools/virtiofsd/passthrough_seccomp.c
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@@ -91,6 +91,9 @@ static const int syscall_allowlist[] = {
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SCMP_SYS(renameat2),
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SCMP_SYS(removexattr),
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SCMP_SYS(restart_syscall),
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+#ifdef __NR_rseq
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+ SCMP_SYS(rseq), /* required since glibc 2.35 */
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+#endif
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SCMP_SYS(rt_sigaction),
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SCMP_SYS(rt_sigprocmask),
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SCMP_SYS(rt_sigreturn),
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--
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2.35.1
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@ -0,0 +1,41 @@
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From 41af4459ac47e107093c3f54b6875d54723aa613 Mon Sep 17 00:00:00 2001
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From: Sebastian Hasler <sebastian.hasler@stuvus.uni-stuttgart.de>
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Date: Thu, 13 Jan 2022 16:32:49 +0100
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Subject: [PATCH 2/2] virtiofsd: Do not support blocking flock
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With the current implementation, blocking flock can lead to
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deadlock. Thus, it's better to return EOPNOTSUPP if a user attempts
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to perform a blocking flock request.
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Signed-off-by: Sebastian Hasler <sebastian.hasler@stuvus.uni-stuttgart.de>
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Message-Id: <20220113153249.710216-1-sebastian.hasler@stuvus.uni-stuttgart.de>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Reviewed-by: Vivek Goyal <vgoyal@redhat.com>
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Reviewed-by: Greg Kurz <groug@kaod.org>
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---
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tools/virtiofsd/passthrough_ll.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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index b3d0674f6d..3e56d1cd95 100644
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--- a/tools/virtiofsd/passthrough_ll.c
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+++ b/tools/virtiofsd/passthrough_ll.c
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@@ -2467,6 +2467,15 @@ static void lo_flock(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi,
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int res;
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(void)ino;
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+ if (!(op & LOCK_NB)) {
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+ /*
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+ * Blocking flock can deadlock as there is only one thread
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+ * serving the queue.
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+ */
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+ fuse_reply_err(req, EOPNOTSUPP);
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+ return;
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+ }
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+
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res = flock(lo_fi_fd(req, fi), op);
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fuse_reply_err(req, res == -1 ? errno : 0);
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--
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2.35.1
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13
qemu.spec
13
qemu.spec
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@ -301,11 +301,13 @@ Obsoletes: %{name}-system-unicore32-core <= %{epoch}:%{version}-%{release}
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%global rcstr -%{rcver}
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%endif
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# To prevent rpmdev-bumpspec breakage
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%global baserelease 7
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Summary: QEMU is a FAST! processor emulator
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Name: qemu
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Version: 6.2.0
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Release: 6%{?rcrel}%{?dist}
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Release: %{baserelease}%{?rcrel}%{?dist}
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Epoch: 2
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License: GPLv2 and BSD and MIT and CC-BY
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URL: http://www.qemu.org/
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@ -329,6 +331,11 @@ Patch0001: 0001-sgx-stub-fix.patch
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# https://bugzilla.redhat.com/show_bug.cgi?id=2046202
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Patch0002: 0001-virtiofsd-Drop-membership-of-all-supplementary-groups.patch
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# Fix various crashes with virtiofsd on F36+
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# https://bugzilla.redhat.com/2070066
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Patch0003: 0001-tools-virtiofsd-Add-rseq-syscall-to-the-seccomp-allo.patch
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Patch0004: 0002-virtiofsd-Do-not-support-blocking-flock.patch
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BuildRequires: meson >= %{meson_version}
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BuildRequires: zlib-devel
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BuildRequires: glib2-devel
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@ -2294,6 +2301,10 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
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%changelog
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* Fri Apr 01 2022 Neal Gompa <ngompa@fedoraproject.org> - 2:6.2.0-7
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- Backport virtiofsd changes to fix crashes on F36+
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Resolves: rhbz#2070066
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* Fri Apr 01 2022 Richard W.M. Jones <rjones@redhat.com> - 2:6.2.0-6
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- Bump and rebuild for SONAME change in libmpathpersist (RHBZ#2069778)
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