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authorAlexei Starovoitov <ast@kernel.org>2021-11-01 15:21:52 -0700
committerAndrii Nakryiko <andrii@kernel.org>2021-11-01 18:05:12 -0700
commit388e2c0b978339dee9b0a81a2e546f8979e021e2 (patch)
tree65f18b9cf0e16c46fd448daa4f17c7ba460ae0b9 /kernel/bpf
parentb9979db8340154526d9ab38a1883d6f6ba9b6d47 (diff)
downloadlinux-388e2c0b978339dee9b0a81a2e546f8979e021e2.tar.bz2
bpf: Fix propagation of signed bounds from 64-bit min/max into 32-bit.
Similar to unsigned bounds propagation fix signed bounds. The 'Fixes' tag is a hint. There is no security bug here. The verifier was too conservative. Fixes: 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20211101222153.78759-2-alexei.starovoitov@gmail.com
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/verifier.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 29671ed49ee8..a4b48bd4e3ca 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1420,7 +1420,7 @@ static void __reg_combine_32_into_64(struct bpf_reg_state *reg)
static bool __reg64_bound_s32(s64 a)
{
- return a > S32_MIN && a < S32_MAX;
+ return a >= S32_MIN && a <= S32_MAX;
}
static bool __reg64_bound_u32(u64 a)