Files
twx-linux/include/linux
Hou Tao d93f65586c bpf: Handle return value of BPF_PROG_TYPE_STRUCT_OPS prog
[ Upstream commit 356ed64991 ]

Currently if a function ptr in struct_ops has a return value, its
caller will get a random return value from it, because the return
value of related BPF_PROG_TYPE_STRUCT_OPS prog is just dropped.

So adding a new flag BPF_TRAMP_F_RET_FENTRY_RET to tell bpf trampoline
to save and return the return value of struct_ops prog if ret_size of
the function ptr is greater than 0. Also restricting the flag to be
used alone.

Fixes: 85d33df357 ("bpf: Introduce BPF_MAP_TYPE_STRUCT_OPS")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210914023351.3664499-1-houtao1@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-10-06 15:55:50 +02:00
..
2020-12-11 14:02:14 -08:00
2021-09-08 08:49:01 +02:00
2021-03-04 11:37:59 +01:00
2021-02-07 15:37:17 +01:00
2021-09-15 09:50:41 +02:00
2021-06-30 08:47:26 -04:00
2021-09-03 10:09:21 +02:00
2021-03-30 14:32:05 +02:00
2021-08-04 12:46:44 +02:00
2021-05-07 11:04:32 +02:00
2021-05-14 09:50:18 +02:00
2021-05-14 09:50:18 +02:00
2021-05-14 09:50:31 +02:00
2021-08-26 08:35:41 -04:00