[PATCH bpf-next v1 2/7] bpf, x86: Use resolved pointer for timed may_goto
From: Siddharth Chintamaneni <hidden>
Date: 2026-09-04 19:52:05
Also in:
bpf, linux-riscv, linux-s390
Subsystem:
bpf jit for x86 64-bit, bpf [general] (safe dynamic programs and tools), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
The timed may_goto fixup now passes the resolved counter pointer through
BPF_REG_AX instead of a stack offset.
Use the pointer directly rather than adding it to RBP. This preserves the
private-stack address selected by the JIT through R9.
Fixes: 2fb761823ead ("bpf, x86: Add x86 JIT support for timed may_goto")
Reported-by: Jeremy Jean <redacted>
Link: https://lore.kernel.org/all/20260824213158.3755932-2-Jeremy.Jean@oss.cyber.gouv.fr/ (local)
Signed-off-by: Siddharth Chintamaneni <redacted>
---
arch/x86/net/bpf_timed_may_goto.S | 6 ------
1 file changed, 6 deletions(-)
diff --git a/arch/x86/net/bpf_timed_may_goto.S b/arch/x86/net/bpf_timed_may_goto.S
index 54c690cae190..6e9d9e7c2b1d 100644
--- a/arch/x86/net/bpf_timed_may_goto.S
+++ b/arch/x86/net/bpf_timed_may_goto.S@@ -11,12 +11,6 @@ SYM_FUNC_START(arch_bpf_timed_may_goto) ANNOTATE_NOENDBR - /* - * r10 passes us stack depth, load the pointer to count and timestamp - * into r10 by adding it to BPF frame pointer. - */ - leaq (%rbp, %r10, 1), %r10 - /* Setup frame. */ pushq %rbp movq %rsp, %rbp
--
2.43.0