diff mbox series

[bpf-next,v3,4/5] selftests/bpf: Add test for reading from STACK_INVALID slots

Message ID 20241202083814.1888784-5-memxor@gmail.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series Fixes for stack with allow_ptr_leaks | expand

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Commit Message

Kumar Kartikeya Dwivedi Dec. 2, 2024, 8:38 a.m. UTC 
Ensure that when CAP_PERFMON is dropped, and the verifier sees
allow_ptr_leaks as false, we are not permitted to read from a
STACK_INVALID slot. Without the fix, the test will report unexpected
success in loading.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 .../selftests/bpf/progs/verifier_spill_fill.c   | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
index 671d9f415dbf..f5cd21326811 100644
--- a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
+++ b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
@@ -1244,4 +1244,21 @@  __naked void old_stack_misc_vs_cur_ctx_ptr(void)
 	: __clobber_all);
 }
 
+SEC("tc")
+__description("stack_noperfmon: reject read of invalid slots")
+__success __failure_unpriv __msg_unpriv("invalid read from stack off -8+1 size 8")
+__caps_unpriv(CAP_BPF)
+__naked void stack_noperfmon_reject_invalid_read(void)
+{
+	asm volatile ("					\
+	r2 = 1;						\
+	r6 = r10;					\
+	r6 += -8;					\
+	*(u8 *)(r6 + 0) = r2;				\
+	r2 = *(u64 *)(r6 + 0);				\
+	r0 = 0;						\
+	exit;						\
+"	::: __clobber_all);
+}
+
 char _license[] SEC("license") = "GPL";