diff options
| author |   Benoît Ganne <bganne@cisco.com> | 2021-04-29 18:24:24 +0200 |
|---|---|---|
| committer |   Damjan Marion <dmarion@me.com> | 2021-05-21 19:50:14 +0000 |
| commit | a42c41be4eed3e1ce2a42038b07ce1d3420891cd (patch) | |
| tree | fc95c7c24cbef993cc2bef8742b3360123d70b66 /src/plugins/af_xdp/unformat.c | |
| parent | 92a8d761c412590f5112239be4c511091b2b2d5a (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.c | 2 |
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 */ |