FAILED: patch "[PATCH] arm64: kprobes: call set_memory_rox() for kprobe page" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 195a1b7d8388c0ec2969a39324feb8bebf9bb907
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025101658-gladiator-reheat-eca3@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 195a1b7d8388c0ec2969a39324feb8bebf9bb907 Mon Sep 17 00:00:00 2001
From: Yang Shi <[email protected]>
Date: Thu, 18 Sep 2025 09:23:49 -0700
Subject: [PATCH] arm64: kprobes: call set_memory_rox() for kprobe page

The kprobe page is allocated by execmem allocator with ROX permission. It needs to call set_memory_rox() to set proper permission for the direct map too. It was missed.

index 0c5d408afd95..8ab6104a4883 100644
@@ -10,6 +10,7 @@
 
 #define pr_fmt(fmt) "kprobes: " fmt
 
+#include <linux/execmem.h>
 #include <linux/extable.h>
 #include <linux/kasan.h>
 #include <linux/kernel.h>

@@ -41,6 +42,17 @@ DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 static void __kprobes
 post_kprobe_handler(struct kprobe *, struct kprobe_ctlblk *, struct pt_regs *);
 
+void *alloc_insn_page(void)
+{
+	void *addr;
+
+	addr = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE);
+	if (!addr)
+		return NULL;
+	set_memory_rox((unsigned long)addr, 1);
+	return addr;
+}
+
 static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
 {
 	kprobe_opcode_t *addr = p->ainsn.xol_insn;

From: Yang Shi <[email protected]>

[ Upstream commit 195a1b7d8388c0ec2969a39324feb8bebf9bb907 ]

The kprobe page is allocated by execmem allocator with ROX permission. It needs to call set_memory_rox() to set proper permission for the direct map too. It was missed.

---
 arch/arm64/kernel/probes/kprobes.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

index 70b91a8c6bb3f..c0942cce3b687 100644
@@ -131,9 +131,15 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 
 void *alloc_insn_page(void)
 {
-	return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
+	void *addr;
+
+	addr = __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
 			GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS,
 			NUMA_NO_NODE, __builtin_return_address(0));
+	if (!addr)
+		return NULL;
+	set_memory_rox((unsigned long)addr, 1);
+	return addr;
 }
 
 /* arm kprobe: install breakpoint in text */

2.51.0