[PATCH bpf-next v4 2/6] x86/alternative: support execmem_alloc() and execmem_free()

[Song Liu <song@kernel.org>]

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(+)

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
-- 
2.30.2