diff options
| author | Mike Rapoport (Microsoft) <rppt@kernel.org> | 2026-07-16 10:51:38 +0300 |
|---|---|---|
| committer | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-07-22 17:27:10 +0200 |
| commit | 5bf02dbf39fa0ec64661827fa4a1b4d5c1d942c0 (patch) | |
| tree | db48d601a19e02349592f1a599af76b55c6270d6 /include/linux | |
| parent | 7516714947da93eed4d7bbb88b3781c38233f2c6 (diff) | |
bpf, x86: Make sure allocation in arch_bpf_trampoline_size() is writable
arch_bpf_trampoline_size() allocates a buffer to get actual size required
for a trampoline.
This buffer must be in the module address space because
__arch_prepare_bpf_trampoline() calculates rel32 offsets relatively to
that buffer.
In preparation for enabling ROX mode for EXECMEM_BPF make sure that the
allocated memory is writable.
Add bpf_jit_alloc_exec_rw() wrapper for execmem_alloc_rw() and use it for
buffer allocation in arch_bpf_trampoline_size().
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20260716-execmem-x86-rox-bpf-v0-v3-4-4e76158c01c5@kernel.org
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/filter.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 14acb2455746..32d5297c557e 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1333,6 +1333,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, void bpf_jit_binary_free(struct bpf_binary_header *hdr); u64 bpf_jit_alloc_exec_limit(void); void *bpf_jit_alloc_exec(unsigned long size); +void *bpf_jit_alloc_exec_rw(unsigned long size); void bpf_jit_free_exec(void *addr); void bpf_jit_free(struct bpf_prog *fp); struct bpf_binary_header * |