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| author | Jiri Olsa <jolsa@kernel.org> | 2022-10-18 09:59:34 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-10-21 03:57:51 +0200 |
| commit | dbe69b29988465b011f198f2797b1c2b6980b50e (patch) | |
| tree | d060772885a0e15050fe1e1eb96697e61ee25ef3 /crypto | |
| parent | bpf: prevent decl_tag from being referenced in func_proto (diff) | |
| download | linux-dbe69b29988465b011f198f2797b1c2b6980b50e.tar.xz linux-dbe69b29988465b011f198f2797b1c2b6980b50e.zip | |
bpf: Fix dispatcher patchable function entry to 5 bytes nop
The patchable_function_entry(5) might output 5 single nop
instructions (depends on toolchain), which will clash with
bpf_arch_text_poke check for 5 bytes nop instruction.
Adding early init call for dispatcher that checks and change
the patchable entry into expected 5 nop instruction if needed.
There's no need to take text_mutex, because we are using it
in early init call which is called at pre-smp time.
Fixes: ceea991a019c ("bpf: Move bpf_dispatcher function out of ftrace locations")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221018075934.574415-1-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions