68 lines
2.3 KiB
Diff
68 lines
2.3 KiB
Diff
From 78152453940967f9ece9fe3ffc5017c669d6ec28 Mon Sep 17 00:00:00 2001
|
|
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
|
Date: Tue, 5 May 2020 16:36:00 +0100
|
|
Subject: [PATCH 9/9] virtiofsd: drop all capabilities in the wait parent
|
|
process
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
Message-id: <20200505163600.22956-8-dgilbert@redhat.com>
|
|
Patchwork-id: 96274
|
|
O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 7/7] virtiofsd: drop all capabilities in the wait parent process
|
|
Bugzilla: 1817445
|
|
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
RH-Acked-by: Max Reitz <mreitz@redhat.com>
|
|
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
|
|
|
|
From: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
|
All this process does is wait for its child. No capabilities are
|
|
needed.
|
|
|
|
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
(cherry picked from commit 66502bbca37ca7a3bfa57e82cfc03b89a7a11eae)
|
|
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
|
---
|
|
tools/virtiofsd/passthrough_ll.c | 13 +++++++++++++
|
|
1 file changed, 13 insertions(+)
|
|
|
|
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
|
|
index 6358874..f41a6b0 100644
|
|
--- a/tools/virtiofsd/passthrough_ll.c
|
|
+++ b/tools/virtiofsd/passthrough_ll.c
|
|
@@ -2535,6 +2535,17 @@ static void print_capabilities(void)
|
|
}
|
|
|
|
/*
|
|
+ * Drop all Linux capabilities because the wait parent process only needs to
|
|
+ * sit in waitpid(2) and terminate.
|
|
+ */
|
|
+static void setup_wait_parent_capabilities(void)
|
|
+{
|
|
+ capng_setpid(syscall(SYS_gettid));
|
|
+ capng_clear(CAPNG_SELECT_BOTH);
|
|
+ capng_apply(CAPNG_SELECT_BOTH);
|
|
+}
|
|
+
|
|
+/*
|
|
* Move to a new mount, net, and pid namespaces to isolate this process.
|
|
*/
|
|
static void setup_namespaces(struct lo_data *lo, struct fuse_session *se)
|
|
@@ -2567,6 +2578,8 @@ static void setup_namespaces(struct lo_data *lo, struct fuse_session *se)
|
|
pid_t waited;
|
|
int wstatus;
|
|
|
|
+ setup_wait_parent_capabilities();
|
|
+
|
|
/* The parent waits for the child */
|
|
do {
|
|
waited = waitpid(child, &wstatus, 0);
|
|
--
|
|
1.8.3.1
|
|
|