From: David S. Miller <davem@davemloft.net>
Date: Thu, 10 Dec 2009 07:57:24 +0000 (-0800)
Subject: sparc: Validate that kprobe address is 4-byte aligned.
X-Git-Tag: firefly_0821_release~9833^2~3139^2~36
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=936cf251787be41833afe2a1e44fbd5fb2adbdb6;p=firefly-linux-kernel-4.4.55.git

sparc: Validate that kprobe address is 4-byte aligned.

Otherwise it isn't a valid instruction address.

This is the sparc equivalent of commit
b46b3d70c9c017d7c4ec49f7f3ffd0af5a622277 (kprobes: Checks probe
address is instruction boudary on x86)

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc/kernel/kprobes.c b/arch/sparc/kernel/kprobes.c
index 3bc6527c95af..6716584e48ab 100644
--- a/arch/sparc/kernel/kprobes.c
+++ b/arch/sparc/kernel/kprobes.c
@@ -46,6 +46,9 @@ struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};
 
 int __kprobes arch_prepare_kprobe(struct kprobe *p)
 {
+	if ((unsigned long) p->addr & 0x3UL)
+		return -EILSEQ;
+
 	p->ainsn.insn[0] = *p->addr;
 	flushi(&p->ainsn.insn[0]);