From bac9f154acd175afdf702cb7d7f5de1254b4b119 Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 26 May 2010 23:26:20 +0200
Subject: [S390] kprobes: forbid probing of stnsm/stosm/epsw
The probed instructions will be executed in a single stepped and irq
disabled context. Therefore the results of stnsm, stosm and epsw would
be wrong if probed.
So let's just disallow probing of these functions. If really needed a
fixup could be written for each of them, but I doubt it's worth it.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
arch/s390/kernel/kprobes.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 3d34eef5a2c..2a3d2bf6f08 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -63,6 +63,8 @@ int __kprobes is_prohibited_opcode(kprobe_opcode_t *instruction)
case 0x0b: /* bsm */
case 0x83: /* diag */
case 0x44: /* ex */
+ case 0xac: /* stnsm */
+ case 0xad: /* stosm */
return -EINVAL;
}
switch (*(__u16 *) instruction) {
@@ -72,6 +74,7 @@ int __kprobes is_prohibited_opcode(kprobe_opcode_t *instruction)
case 0xb258: /* bsg */
case 0xb218: /* pc */
case 0xb228: /* pt */
+ case 0xb98d: /* epsw */
return -EINVAL;
}
return 0;
--
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