| Message ID | 20221107223921.3451913-3-song@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | execmem_alloc for BPF programs | expand |
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 5cadcea035e0..e38829f19a81 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -1270,6 +1270,18 @@ void *text_poke_copy(void *addr, const void *opcode, size_t len) return addr; } +void *arch_fill_execmem(void *dst, void *src, size_t len) +{ + if (text_poke_copy(dst, src, len) == NULL) + return ERR_PTR(-EINVAL); + return dst; +} + +int arch_invalidate_execmem(void *ptr, size_t len) +{ + return IS_ERR_OR_NULL(text_poke_set(ptr, 0xcc, len)); +} + /** * text_poke_set - memset into (an unused part of) RX memory * @addr: address to modify
Implement arch_fill_execmem() and arch_invalidate_execmem() to support execmem_alloc. arch_fill_execmem() copies dynamic kernel text (such as BPF programs) to RO+X memory region allocated by execmem_alloc(). arch_invalidate_execmem() fills memory with 0xcc after it is released by execmem_free(). Signed-off-by: Song Liu <song@kernel.org> --- arch/x86/kernel/alternative.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)