summaryrefslogtreecommitdiff
path: root/tools
diff options
context:
space:
mode:
authorKumar Kartikeya Dwivedi <memxor@gmail.com>2024-12-03 20:47:56 -0800
committerAlexei Starovoitov <ast@kernel.org>2024-12-04 09:19:50 -0800
commitf513c3635078fc184af66b1af9e4f2b2d19b7d79 (patch)
treeb2baa9ad325ba3ff54a3b55d7eda554baea0ed59 /tools
parentadfdd9c68566120debc622712888c4d084539081 (diff)
selftests/bpf: Add test for reading from STACK_INVALID slots
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> Link: https://lore.kernel.org/r/20241204044757.1483141-5-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/bpf/progs/verifier_spill_fill.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
index 671d9f415dbf..bab6d789ba00 100644
--- a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
+++ b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
@@ -1244,4 +1244,22 @@ __naked void old_stack_misc_vs_cur_ctx_ptr(void)
: __clobber_all);
}
+SEC("socket")
+__description("stack_noperfmon: reject read of invalid slots")
+__success
+__caps_unpriv(CAP_BPF)
+__failure_unpriv __msg_unpriv("invalid read from stack off -8+1 size 8")
+__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";