The JITs should not depend on the verifier for zero extending the upper
32 bits of the destination register when loading a byte, half-word, or
word.
A following patch will make the verifier stop patching zext instructions
after LDX.
Signed-off-by: Puranjay Mohan <[email protected]>
---
arch/x86/net/bpf_jit_comp32.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
index 429a89c5468b..aef9183ff107 100644
--- a/arch/x86/net/bpf_jit_comp32.c
+++ b/arch/x86/net/bpf_jit_comp32.c
@@ -2050,8 +2050,6 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_B:
case BPF_H:
case BPF_W:
- if (bpf_prog->aux->verifier_zext)
- break;
if (dstk) {
EMIT3(0xC7, add_1reg(0x40, IA32_EBP),
STACK_VAR(dst_hi));
--
2.39.2