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| author | Wang YanQing <udknight@gmail.com> | 2018-05-11 06:06:34 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-06-05 11:46:13 +0300 |
| commit | 2b589a7e2bd3eb610a4b7f5e61393481755a4de9 (patch) | |
| tree | a9e0ebdb78fa6530ee26bf7c546bef6e5482ed5f /arch | |
| parent | 34ea38ca27991466a8fff849514b4181b42ae2eb (diff) | |
| download | linux-2b589a7e2bd3eb610a4b7f5e61393481755a4de9.tar.xz | |
bpf, arm32: correct check_imm24
imm24 is signed, so the right range is:
[-(1<<(24 - 1)), (1<<(24 - 1)) - 1]
Note: this patch also fix a typo.
Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Wang YanQing <udknight@gmail.com>
Cc: Shubham Bansal <illusionist.neo@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux@armlinux.org.uk
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index d3ea6454e775..0d542007b49d 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -84,7 +84,7 @@ * * 1. First argument is passed using the arm 32bit registers and rest of the * arguments are passed on stack scratch space. - * 2. First callee-saved arugument is mapped to arm 32 bit registers and rest + * 2. First callee-saved argument is mapped to arm 32 bit registers and rest * arguments are mapped to scratch space on stack. * 3. We need two 64 bit temp registers to do complex operations on eBPF * registers. @@ -1192,8 +1192,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) s32 jmp_offset; #define check_imm(bits, imm) do { \ - if ((((imm) > 0) && ((imm) >> (bits))) || \ - (((imm) < 0) && (~(imm) >> (bits)))) { \ + if ((imm) >= (1 << ((bits) - 1)) || \ + (imm) < -(1 << ((bits) - 1))) { \ pr_info("[%2d] imm=%d(0x%x) out of range\n", \ i, imm, imm); \ return -EINVAL; \ |