Hou Tao d93f65586c bpf: Handle return value of BPF_PROG_TYPE_STRUCT_OPS prog ... [ Upstream commit 356ed64991c6847a0c4f2e8fa3b1133f7a14f1fc ] 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
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Makefile	…
bpf_jit_comp.c	bpf: Handle return value of BPF_PROG_TYPE_STRUCT_OPS prog	2021-10-06 15:55:50 +02:00
bpf_jit_comp32.c	bpf: Introduce BPF nospec instruction for mitigating Spectre v4	2021-08-04 12:46:44 +02:00