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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2010-05-26 23:26:20 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-05-26 23:26:29 +0200 |
| commit | bac9f154acd175afdf702cb7d7f5de1254b4b119 (patch) | |
| tree | 46a9dc8dc42336842fa9410504e5b07b00173ad2 /arch/s390 | |
| parent | 215b3096371907e5d866bb219be7ef3d5ce6c083 (diff) | |
| download | linux-bac9f154acd175afdf702cb7d7f5de1254b4b119.tar.bz2 | |
[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/s390')
| -rw-r--r-- | arch/s390/kernel/kprobes.c | 3 |
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) 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; |