diff mbox series

[bpf-next,v1,2/2] bpf/selftest: add selftest for may_goto

Message ID 20250212135251.85487-3-mrpre@163.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Fix array bounds error with may_goto and add selftest | expand

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netdev/series_format success Posting correctly formatted
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netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/build_tools success Errors and warnings before: 26 (+1) this patch: 26 (+1)
netdev/cc_maintainers warning 1 maintainers not CCed: linux-kselftest@vger.kernel.org
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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Commit Message

Jiayuan Chen Feb. 12, 2025, 1:52 p.m. UTC 
Add test case to ensure normal operation when may_goto exists and the
stack size has already reached 512.

./test_progs -t verifier_stack_ptr
...
verifier_stack_ptr/PTR_TO_STACK max stack size > 512:OK
verifier_stack_ptr/PTR_TO_STACK max stack size 512 with may_goto:OK
...

Signed-off-by: Jiayuan Chen <mrpre@163.com>
---
 .../selftests/bpf/progs/verifier_stack_ptr.c  | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c b/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
index 417c61cd4b19..b2e84714e1bc 100644
--- a/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
+++ b/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
@@ -481,4 +481,37 @@  l1_%=:	r0 = 42;					\
 	: __clobber_all);
 }
 
+SEC("socket")
+__description("PTR_TO_STACK max stack size > 512")
+__failure __msg("invalid write to stack R1 off=-520 size=8")
+__naked void stack_check_size_gt_512(void)
+{
+	asm volatile (
+	"r1 = r10;"
+	"r1 += -520;"
+	"r0 = 42;"
+	"*(u64*)(r1 + 0) = r0;"
+	"exit;"
+	::: __clobber_all);
+}
+
+#ifdef __BPF_FEATURE_MAY_GOTO
+SEC("socket")
+__description("PTR_TO_STACK max stack size 512 with may_goto")
+__success
+__retval(42)
+__naked void stack_check_size_512_with_may_goto(void)
+{
+	asm volatile (
+	"r1 = r10;"
+	"r1 += -512;"
+	"r0 = 42;"
+	"*(u32*)(r1 + 0) = r0;"
+	"may_goto end;"
+	"r2 = 100;"
+"end:	exit;"
+	::: __clobber_all);
+}
+#endif
+
 char _license[] SEC("license") = "GPL";