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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-09-27 15:24:38 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-09-30 13:04:40 +0200 |
| commit | dbbfe487e5f3fc00c9fe5207d63309859704d12f (patch) | |
| tree | afa7a57191434a8838f450986ca5a22b255990d7 | |
| parent | s390: Allow vmalloc target buffers for copy_from_oldmem() (diff) | |
| download | linux-dbbfe487e5f3fc00c9fe5207d63309859704d12f.tar.xz linux-dbbfe487e5f3fc00c9fe5207d63309859704d12f.zip | |
s390: fix system call restart after inferior call
Git commit 616498813b11ffef "s390: system call path micro optimization"
introduced a regression in regard to system call restarting and inferior
function calls via the ptrace interface. The pointer to the system call
table needs to be loaded in sysc_sigpending if do_signal returns with
TIF_SYSCALl set after it restored a system call context.
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/kernel/entry.S | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/entry64.S | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index cc30d1fb000c..0dc2b6d0a1ec 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -266,6 +266,7 @@ sysc_sigpending: tm __TI_flags+3(%r12),_TIF_SYSCALL jno sysc_return lm %r2,%r7,__PT_R2(%r11) # load svc arguments + l %r10,__TI_sysc_table(%r12) # 31 bit system call table xr %r8,%r8 # svc 0 returns -ENOSYS clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2) jnl sysc_nr_ok # invalid svc number -> do svc 0 diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 2b2188b97c6a..e5b43c97a834 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -297,6 +297,7 @@ sysc_sigpending: tm __TI_flags+7(%r12),_TIF_SYSCALL jno sysc_return lmg %r2,%r7,__PT_R2(%r11) # load svc arguments + lg %r10,__TI_sysc_table(%r12) # address of system call table lghi %r8,0 # svc 0 returns -ENOSYS llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number cghi %r1,NR_syscalls |