diff options
| author | Hari Bathini <hbathini@linux.ibm.com> | 2023-10-20 19:43:56 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-23 20:33:19 +1100 |
| commit | 033ffaf0af1f974ecf401db3f70aae6fe1a90fc5 (patch) | |
| tree | 38d47ece63167b26626246fb3531ab1ccc4247fe /arch/powerpc/net | |
| parent | 6efc1675acb88eef45ef0156b93f95d66a8ee759 (diff) | |
powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack
Implement bpf_arch_text_invalidate and use it to fill unused part of
the bpf_prog_pack with trap instructions when a BPF program is freed.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231020141358.643575-4-hbathini@linux.ibm.com
Diffstat (limited to 'arch/powerpc/net')
| -rw-r--r-- | arch/powerpc/net/bpf_jit_comp.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index c21cb88b09e4..0a5a9758903a 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -292,3 +292,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) return err ? ERR_PTR(err) : dst; } + +int bpf_arch_text_invalidate(void *dst, size_t len) +{ + u32 insn = BREAKPOINT_INSTRUCTION; + int ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return -EINVAL; + + mutex_lock(&text_mutex); + ret = patch_instructions(dst, &insn, len, true); + mutex_unlock(&text_mutex); + + return ret; +} |