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bpf: fix net.core.bpf_jit_enable race

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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 <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Alexei Starovoitov 2017-12-14 17:55:14 -08:00 • committed by Daniel Borkmann
commit 60b58afc96
10 changed files with 13 additions and 11 deletions
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2
arch/sparc/net/bpf_jit_comp_64.c
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@ -1517,7 +1517,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
u8 *image_ptr;
int pass;
if (!bpf_jit_enable)
if (!prog->jit_requested)
return orig_prog;
tmp = bpf_jit_blind_constants(prog);