diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-01 13:32:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-12-09 08:55:45 -0800 |
| commit | 05602145e34077a8314636d15ad3dae4c7dd81e4 (patch) | |
| tree | 03818fa82c96ece5d5453586f94f2b9ab296693a | |
| parent | a6ff8af2ed1af704e400b558b2811ce7a350d2eb (diff) | |
| download | lwn-05602145e34077a8314636d15ad3dae4c7dd81e4.tar.gz lwn-05602145e34077a8314636d15ad3dae4c7dd81e4.zip | |
add missing .set function for NT_S390_LAST_BREAK regset
commit b934069c991355d27a053a932591c77960f4e414 upstream.
The last breaking event address is a read-only value, the regset misses the
.set function. If a PTRACE_SETREGSET is done for NT_S390_LAST_BREAK we
get an oops due to a branch to zero:
Kernel BUG at 0000000000000002 verbose debug info unavailable
illegal operation: 0001 #1 SMP
...
Call Trace:
(<0000000000158294> ptrace_regset+0x184/0x188)
<00000000001595b6> ptrace_request+0x37a/0x4fc
<0000000000109a78> arch_ptrace+0x108/0x1fc
<00000000001590d6> SyS_ptrace+0xaa/0x12c
<00000000005c7a42> sysc_noemu+0x16/0x1c
<000003fffd5ec10c> 0x3fffd5ec10c
Last Breaking-Event-Address:
<0000000000158242> ptrace_regset+0x132/0x188
Add a nop .set function to prevent the branch to zero.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index ae0e14b8880c..5804cfa7cba7 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -897,6 +897,14 @@ static int s390_last_break_get(struct task_struct *target, return 0; } +static int s390_last_break_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + return 0; +} + #endif static const struct user_regset s390_regsets[] = { @@ -923,6 +931,7 @@ static const struct user_regset s390_regsets[] = { .size = sizeof(long), .align = sizeof(long), .get = s390_last_break_get, + .set = s390_last_break_set, }, #endif }; @@ -1080,6 +1089,14 @@ static int s390_compat_last_break_get(struct task_struct *target, return 0; } +static int s390_compat_last_break_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + return 0; +} + static const struct user_regset s390_compat_regsets[] = { [REGSET_GENERAL] = { .core_note_type = NT_PRSTATUS, @@ -1103,6 +1120,7 @@ static const struct user_regset s390_compat_regsets[] = { .size = sizeof(long), .align = sizeof(long), .get = s390_compat_last_break_get, + .set = s390_compat_last_break_set, }, [REGSET_GENERAL_EXTENDED] = { .core_note_type = NT_S390_HIGH_GPRS, |