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selftests/bpf: Add selftest for may_goto

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Added test cases to ensure that programs with stack sizes exceeding 512
bytes are restricted in non-JITed mode, and can be executed normally in
JITed mode, even with stack sizes exceeding 512 bytes due to the presence
of may_goto instructions.

Test result:
echo "0" > /proc/sys/net/core/bpf_jit_enable
./test_progs -t verifier_stack_ptr
...
stack size 512 with may_goto with jit:SKIP
stack size 512 with may_goto without jit:OK
...
Summary: 1/27 PASSED, 25 SKIPPED, 0 FAILED

echo "1" > /proc/sys/net/core/bpf_jit_enable
./test_progs -t verifier_stack_ptr
...
stack size 512 with may_goto with jit:OK
stack size 512 with may_goto without jit:SKIP
...
Summary: 1/27 PASSED, 25 SKIPPED, 0 FAILED

Signed-off-by: Jiayuan Chen <mrpre@163.com>
Link: https://lore.kernel.org/r/20250214091823.46042-4-mrpre@163.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiayuan Chen
2025-02-14 17:18:23 +08:00
committed by Alexei Starovoitov
parent b38c72ab80
commit 72266ee83f
1 changed files with 52 additions and 0 deletions
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52
tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
View File

@@ -481,4 +481,56 @@ l1_%=: r0 = 42; \
: __clobber_all);
}
SEC("socket")
__description("PTR_TO_STACK 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 stack size 512 with may_goto with jit")
__load_if_JITed()
__success __retval(42)
__naked void stack_check_size_512_with_may_goto_jit(void)
{
asm volatile (" \
r1 = r10; \
r1 += -512; \
r0 = 42; \
*(u32*)(r1 + 0) = r0; \
may_goto l0_%=; \
r2 = 100; \
l0_%=: \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("PTR_TO_STACK stack size 512 with may_goto without jit")
__load_if_no_JITed()
__failure __msg("stack size 520(extra 8) is too large")
__naked void stack_check_size_512_with_may_goto(void)
{
asm volatile (" \
r1 = r10; \
r1 += -512; \
r0 = 42; \
*(u32*)(r1 + 0) = r0; \
may_goto l0_%=; \
r2 = 100; \
l0_%=: \
exit; \
" ::: __clobber_all);
}
#endif
char _license[] SEC("license") = "GPL";