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[bpf-next,4/4] selftests/bpf: Fix verifier tailcall jit selftest

Message ID 20240825130943.7738-5-leon.hwang@linux.dev (mailing list archive)
State Superseded
Delegated to: BPF
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Series bpf: Fix tailcall infinite loop caused by freplace | expand

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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 7 this patch: 7
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netdev/cc_maintainers warning 10 maintainers not CCed: sdf@fomichev.me mykolal@fb.com haoluo@google.com jolsa@kernel.org shuah@kernel.org linux-kselftest@vger.kernel.org song@kernel.org kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com
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netdev/check_selftest success No net selftest shell script
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Commit Message

Leon Hwang Aug. 25, 2024, 1:09 p.m. UTC 
The verifier tailcall jit selftest is broken, because the prologue of x86
bpf prog has been updated to fix the tailcall infinite loop issue caused
by freplace.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
---
 tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c
index 8d60c634a114f..60a6045e2d9ae 100644
--- a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c
+++ b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c
@@ -33,8 +33,8 @@  __success
 __arch_x86_64
 /* program entry for main(), regular function prologue */
 __jited("	endbr64")
-__jited("	nopl	(%rax,%rax)")
 __jited("	xorq	%rax, %rax")
+__jited("	nopl	(%rax,%rax)")
 __jited("	pushq	%rbp")
 __jited("	movq	%rsp, %rbp")
 /* tail call prologue for program:
@@ -63,8 +63,8 @@  __jited("	{{(retq|jmp	0x)}}")		/* return or jump to rethunk */
 __jited("...")
 /* subprogram entry for sub(), regular function prologue */
 __jited("	endbr64")
-__jited("	nopl	(%rax,%rax)")
 __jited("	nopl	(%rax)")
+__jited("	nopl	(%rax,%rax)")
 __jited("	pushq	%rbp")
 __jited("	movq	%rsp, %rbp")
 /* tail call prologue for subprogram address of tail call counter