From: Karl Mehltretter <kmehltretter@gmail.com>
To: Hari Bathini <hbathini@linux.ibm.com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Karl Mehltretter <kmehltretter@gmail.com>,
Naveen N Rao <naveen@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Abhishek Dubey <adubey@linux.ibm.com>,
Dan Carpenter <error27@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>
Subject: [PATCH] powerpc32/bpf: return false from bpf_jit_supports_fsession() on ppc32
Date: Sat, 3 Oct 2026 20:42:26 +0200 [thread overview]
Message-ID: <20261003184226.76740-1-kmehltretter@gmail.com> (raw)
bpf_jit_supports_fsession() returns bool. Commit 92258b5bf1ec
("powerpc32/bpf: Add fsession support") made it return -EOPNOTSUPP on
ppc32 until fsession is validated there. The negative value converts to
true, so the verifier does not reject fsession programs on ppc32. Such a
program loads, and only attaching it fails because
__arch_prepare_bpf_trampoline() returns -EOPNOTSUPP on ppc32.
Return false instead. The load then fails with "JIT does not support
fsession". Tested with a ppc32 kernel on QEMU g3beige.
Fixes: 92258b5bf1ec ("powerpc32/bpf: Add fsession support")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202608010958.cYfBCQAC-lkp@intel.com/
Assisted-by: LLM
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
---
arch/powerpc/net/bpf_jit_comp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index 7a612688e7a2..64e70f3226b2 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -539,7 +539,7 @@ bool bpf_jit_supports_fsession(void)
* for fsession and trampoline on ppc32.
*/
if (IS_ENABLED(CONFIG_PPC32))
- return -EOPNOTSUPP;
+ return false;
return true;
}
base-commit: e767a4ea70a3992c37ed604157d32f0dfbf9b1e3
--
2.53.0
reply other threads:[~2026-10-03 18:42 UTC|newest]
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