From: "Jose E. Marchesi" <[email protected]>
[ Upstream commit cd3fc3b9782130a5bc1dc3dfccffbc1657637a93 ]
[Changes from V1:
- The warning to disable is -Wmaybe-uninitialized, not -Wuninitialized.
- This warning is only supported in GCC.]
The BPF selftest verifier_global_subprogs.c contains code that
purposedly performs out of bounds access to memory, to check whether
the kernel verifier is able to catch them. For example:
__noinline int global_unsupp(const int *mem)
{
if (!mem)
return 0;
return mem[100]; /* BOOM */
}
With -O1 and higher and no inlining, GCC notices this fact and emits a
"maybe uninitialized" warning. This is by design. Note that the
emission of these warnings is highly dependent on the precise
optimizations that are performed.
This patch adds a compiler pragma to verifier_global_subprogs.c to
ignore these warnings.
Tested in bpf-next master.
No regressions.
Signed-off-by: Jose E. Marchesi <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Yonghong Song <[email protected]>
Cc: Eduard Zingerman <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
.../testing/selftests/bpf/progs/verifier_global_subprogs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
b/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
index baff5ffe94051..a9fc30ed4d732 100644
--- a/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
+++ b/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
@@ -8,6 +8,13 @@
#include "xdp_metadata.h"
#include "bpf_kfuncs.h"
+/* The compiler may be able to detect the access to uninitialized
+ memory in the routines performing out of bound memory accesses and
+ emit warnings about it. This is the case of GCC. */
+#if !defined(__clang__)
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
int arr[1];
int unkn_idx;
const volatile bool call_dead_subprog = false;
--
2.43.0
