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Brahmajit Das says: ==================== bpf: Fix verifier crash on BPF_NEG with pointer register This patch fixes a crash in the BPF verifier triggered when the BPF_NEG operation is applied to a pointer-typed register. The verifier now checks that the destination register is not a pointer before performing the operation. Tested with syzkaller reproducer and new BPF sefltest. Closes: https://syzkaller.appspot.com/bug?extid=d36d5ae81e1b0a53ef58 Changes v4: Cleaning up, instead of using __is_pointer_value it's further simplified by checking if regs[insn->dst_reg].type of SCALAR_VALUE Link: Changes in v3: using __is_pointer_value to check if register if of pointer type Link: https://lore.kernel.org/all/20251001095613.267475-1-listout@listout.xyz/ Changes in v2: Checking if reg->map_ptr is NULL in bpf/log.c but with cleaner approach (wrong approach) Link: https://lore.kernel.org/all/20250923174738.1713751-1-listout@listout.xyz/ Changes in v1: Checking if reg->map_ptr is NULL in bpf/log.c (wrong approach) Link: https://lore.kernel.org/all/20250923164144.1573636-1-listout@listout.xyz/ ==================== Link: https://patch.msgid.link/20251001191739.2323644-1-listout@listout.xyz Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
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