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Puranjay Mohan 44d79142ed bpf: Temporarily disable atomic operations in BPF arena
Currently, the x86 JIT handling PROBE_MEM32 tagged accesses is not
equipped to handle atomic accesses into PTR_TO_ARENA, as no PROBE_MEM32
tagging is performed and no handling is enabled for them.

This will lead to unsafety as the offset into arena will dereferenced
directly without turning it into a base + offset access into the arena
region.

Since the changes to the x86 JIT will be fairly involved, for now,
temporarily disallow use of PTR_TO_ARENA as the destination operand for
atomics until support is added to the JIT backend.

Fixes: 2fe99eb0cc ("bpf: Add x86-64 JIT support for PROBE_MEM32 pseudo instructions.")
Reported-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Message-ID: <20240314174931.98702-1-puranjay12@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
History 2024-03-14 12:04:45 -07:00
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