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| author | Puranjay Mohan <puranjay12@gmail.com> | 2024-03-14 20:49:31 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2024-03-14 22:04:45 +0300 |
| commit | 44d79142ede8162fd67bf8ca4ddbda1fbcfa94f1 (patch) | |
| tree | ea5ef659bcaa1dc72bb8258baa47b3a9e59fd2db /scripts | |
| parent | e30cef001da259e8df354b813015d0e5acc08740 (diff) | |
| download | linux-44d79142ede8162fd67bf8ca4ddbda1fbcfa94f1.tar.xz | |
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: 2fe99eb0ccf2 ("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>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions