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authorHeiko Carstens <heiko.carstens@de.ibm.com>2010-05-26 17:26:20 -0400
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-05-26 17:26:29 -0400
commitbac9f154acd175afdf702cb7d7f5de1254b4b119 (patch)
tree46a9dc8dc42336842fa9410504e5b07b00173ad2 /arch
parent215b3096371907e5d866bb219be7ef3d5ce6c083 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/kprobes.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 3d34eef5a2c3..2a3d2bf6f083 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)
63 case 0x0b: /* bsm */ 63 case 0x0b: /* bsm */
64 case 0x83: /* diag */ 64 case 0x83: /* diag */
65 case 0x44: /* ex */ 65 case 0x44: /* ex */
66 case 0xac: /* stnsm */
67 case 0xad: /* stosm */
66 return -EINVAL; 68 return -EINVAL;
67 } 69 }
68 switch (*(__u16 *) instruction) { 70 switch (*(__u16 *) instruction) {
@@ -72,6 +74,7 @@ int __kprobes is_prohibited_opcode(kprobe_opcode_t *instruction)
72 case 0xb258: /* bsg */ 74 case 0xb258: /* bsg */
73 case 0xb218: /* pc */ 75 case 0xb218: /* pc */
74 case 0xb228: /* pt */ 76 case 0xb228: /* pt */
77 case 0xb98d: /* epsw */
75 return -EINVAL; 78 return -EINVAL;
76 } 79 }
77 return 0; 80 return 0;