]> git.baikalelectronics.ru Git - kernel.git/commit
bpf: fix net.core.bpf_jit_enable race
authorAlexei Starovoitov <ast@fb.com>
Fri, 15 Dec 2017 01:55:14 +0000 (17:55 -0800)
committerDaniel Borkmann <daniel@iogearbox.net>
Sun, 17 Dec 2017 19:34:36 +0000 (20:34 +0100)
commit9279b11084f475addf886936bc02f0705c29eb42
tree5651c4845120fc28c9712f53f31962adfd4abe73
parent0236c4caf9c02b281697cfcea8088b4dc263f301
bpf: fix net.core.bpf_jit_enable race

global bpf_jit_enable variable is tested multiple times in JITs,
blinding and verifier core. The malicious root can try to toggle
it while loading the programs. This race condition was accounted
for and there should be no issues, but it's safer to avoid
this race condition.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
arch/arm/net/bpf_jit_32.c
arch/arm64/net/bpf_jit_comp.c
arch/mips/net/ebpf_jit.c
arch/powerpc/net/bpf_jit_comp64.c
arch/s390/net/bpf_jit_comp.c
arch/sparc/net/bpf_jit_comp_64.c
arch/x86/net/bpf_jit_comp.c
include/linux/filter.h
kernel/bpf/core.c
kernel/bpf/verifier.c