diff options
| author | Cupertino Miranda <cupertino.miranda@oracle.com> | 2024-05-06 17:18:48 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2024-05-07 03:09:12 +0300 |
| commit | 41d047a871062f1a4d1871a1908d380c14e75428 (patch) | |
| tree | 3461ffd9f5283a4ff853a704fb887b0d798ff767 /kernel | |
| parent | 5ec9a7d13f49b9c1c5ba854244d1f2ba414cf139 (diff) | |
| download | linux-41d047a871062f1a4d1871a1908d380c14e75428.tar.xz | |
bpf/verifier: relax MUL range computation check
MUL instruction required that src_reg would be a known value (i.e.
src_reg would be a const value). The condition in this case can be
relaxed, since the range computation algorithm used in current code
already supports a proper range computation for any valid range value on
its operands.
Signed-off-by: Cupertino Miranda <cupertino.miranda@oracle.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: David Faust <david.faust@oracle.com>
Cc: Jose Marchesi <jose.marchesi@oracle.com>
Cc: Elena Zannoni <elena.zannoni@oracle.com>
Link: https://lore.kernel.org/r/20240506141849.185293-6-cupertino.miranda@oracle.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/verifier.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 1f6deb3e44c5..9e3aba08984e 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -13902,12 +13902,8 @@ static bool is_safe_to_compute_dst_reg_range(struct bpf_insn *insn, case BPF_AND: case BPF_XOR: case BPF_OR: - return true; - - /* Compute range for the following only if the src_reg is const. - */ case BPF_MUL: - return src_is_const; + return true; /* Shift operators range is only computable if shift dimension operand * is a constant. Shifts greater than 31 or 63 are undefined. This |