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| author | Roman Gushchin <guro@fb.com> | 2018-04-23 20:09:21 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-04-24 00:20:11 +0300 |
| commit | 6899b32b5b2dee358936b82b8363b716607a138f (patch) | |
| tree | c03f591222ed167114beaf85729104667c187b88 /Documentation | |
| parent | 77621f024d6be732e43366a42203486b6ec89acd (diff) | |
| download | linux-6899b32b5b2dee358936b82b8363b716607a138f.tar.xz | |
bpf: disable and restore preemption in __BPF_PROG_RUN_ARRAY
Running bpf programs requires disabled preemption,
however at least some* of the BPF_PROG_RUN_ARRAY users
do not follow this rule.
To fix this bug, and also to make it not happen in the future,
let's add explicit preemption disabling/re-enabling
to the __BPF_PROG_RUN_ARRAY code.
* for example:
[ 17.624472] RIP: 0010:__cgroup_bpf_run_filter_sk+0x1c4/0x1d0
...
[ 17.640890] inet6_create+0x3eb/0x520
[ 17.641405] __sock_create+0x242/0x340
[ 17.641939] __sys_socket+0x57/0xe0
[ 17.642370] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 17.642944] SyS_socket+0xa/0x10
[ 17.643357] do_syscall_64+0x79/0x220
[ 17.643879] entry_SYSCALL_64_after_hwframe+0x42/0xb7
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions