Commit bac9f154 authored May 26, 2010 by Heiko Carstens Committed by Martin Schwidefsky May 26, 2010

[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>

parent 215b3096

arch/s390/kernel/kprobes.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;