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bpf: Fix propagation of signed bounds from 64-bit min/max into 32-bit.
author
Alexei Starovoitov
<ast@kernel.org>
Mon, 1 Nov 2021 22:21:52 +0000
(15:21 -0700)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Thu, 18 Nov 2021 13:04:13 +0000
(14:04 +0100)
[ Upstream commit
388e2c0b978339dee9b0a81a2e546f8979e021e2
]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
kernel/bpf/verifier.c
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diff --git
a/kernel/bpf/verifier.c
b/kernel/bpf/verifier.c
index
c56739a
..
a15826a
100644
(file)
--- a/
kernel/bpf/verifier.c
+++ b/
kernel/bpf/verifier.c
@@
-1298,7
+1298,7
@@
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)