[PATCH] arm64: kprobes: Drop ID map text from kprobes blacklist

[Ard Biesheuvel]

The ID mapped text region is never accessed via the normal kernel
mapping of text, and so it was moved into .rodata instead. This means it
is no longer considered as a suitable place for kprobes by default, and
the explicit blacklist is unnecessary, and actually results in an error
message at boot:

  kprobes: Failed to populate blacklist (error -22), kprobes not restricted, be careful using them!

So stop blacklisting the ID map text explicitly.

Fixes: af7249b317e4d0b3d ("arm64: kernel: move identity map out of .text mapping")
Reported-by: Nathan Chancellor <nathan at kernel.org>
Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
---
 arch/arm64/kernel/probes/kprobes.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index f35d059a9a366fa6..70b91a8c6bb3f358 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -387,10 +387,6 @@ int __init arch_populate_kprobe_blacklist(void)
 					(unsigned long)__irqentry_text_end);
 	if (ret)
 		return ret;
-	ret = kprobe_add_area_blacklist((unsigned long)__idmap_text_start,
-					(unsigned long)__idmap_text_end);
-	if (ret)
-		return ret;
 	ret = kprobe_add_area_blacklist((unsigned long)__hyp_text_start,
 					(unsigned long)__hyp_text_end);
 	if (ret || is_kernel_in_hyp_mode())
-- 
2.39.1