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authorBenoît Ganne <bganne@cisco.com>2021-04-29 18:24:24 +0200
committerDamjan Marion <dmarion@me.com>2021-05-21 19:50:14 +0000
commita42c41be4eed3e1ce2a42038b07ce1d3420891cd (patch)
treefc95c7c24cbef993cc2bef8742b3360123d70b66 /src/plugins/af_xdp/unformat.c
parent92a8d761c412590f5112239be4c511091b2b2d5a (diff)
af_xdp: workaround kernel race between poll() and sendmsg()
Prior to Linux 5.6 there is a race condition between poll() and sendmsg() in the kernel. This patch protects the syscalls with a lock to prevent it, unless the NO_SYSCALL_LOCK flag is set at create time. See https://lore.kernel.org/bpf/BYAPR11MB365382C5DB1E5FCC53242609C1549@BYAPR11MB3653.namprd11.prod.outlook.com/ Type: fix Change-Id: Ie7d4f5cb41f697b11a09b6046e54d190430d76df Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/plugins/af_xdp/unformat.c')
-rw-r--r--src/plugins/af_xdp/unformat.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/plugins/af_xdp/unformat.c b/src/plugins/af_xdp/unformat.c
index b2292464112..bb4c3048d23 100644
--- a/src/plugins/af_xdp/unformat.c
+++ b/src/plugins/af_xdp/unformat.c
@@ -50,6 +50,8 @@ unformat_af_xdp_create_if_args (unformat_input_t * input, va_list * vargs)
args->mode = AF_XDP_MODE_COPY;
else if (unformat (line_input, "zero-copy"))
args->mode = AF_XDP_MODE_ZERO_COPY;
+ else if (unformat (line_input, "no-syscall-lock"))
+ args->flags |= AF_XDP_CREATE_FLAGS_NO_SYSCALL_LOCK;
else
{
/* return failure on unknown input */