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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2011-12-01 13:32:17 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-12-01 13:32:17 +0100
commitb934069c991355d27a053a932591c77960f4e414 (patch)
treef76b362d58c877e8e73499fec71b5644c28cd7ad /arch/s390/kernel/ptrace.c
parent7c81878b34dd1b75dec5c8b68951d1439854d358 (diff)
[S390] add missing .set function for NT_S390_LAST_BREAK regset
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> Cc: stable@kernel.org
Diffstat (limited to 'arch/s390/kernel/ptrace.c')
-rw-r--r--arch/s390/kernel/ptrace.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 450931a45b6..f05649fd054 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -905,6 +905,14 @@ 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 int s390_system_call_get(struct task_struct *target,
@@ -951,6 +959,7 @@ static const struct user_regset s390_regsets[] = {
.size = sizeof(long),
.align = sizeof(long),
.get = s390_last_break_get,
+ .set = s390_last_break_set,
},
#endif
[REGSET_SYSTEM_CALL] = {
@@ -1116,6 +1125,14 @@ 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,
@@ -1139,6 +1156,7 @@ 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_SYSTEM_CALL] = {
.core_note_type = NT_S390_SYSTEM_CALL,