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| author | Sven Schnelle <svens@linux.ibm.com> | 2021-06-11 16:08:18 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-06-30 08:47:03 -0400 |
| commit | cf9fdfe7ac67776416edce83bc02c5836e137919 (patch) | |
| tree | e295fb63bb235a31a10ea2fbec0416edccfb57ce | |
| parent | c37ba4086c805c8309cd6a431a0c426de05bcf51 (diff) | |
| download | linux-stable-cf9fdfe7ac67776416edce83bc02c5836e137919.tar.gz linux-stable-cf9fdfe7ac67776416edce83bc02c5836e137919.tar.bz2 linux-stable-cf9fdfe7ac67776416edce83bc02c5836e137919.zip | |
s390: clear pt_regs::flags on irq entry
commit ca1f4d702d534387aa1f16379edb3b03cdb6ceda upstream.
The current irq entry code doesn't initialize pt_regs::flags. On exit to
user mode arch_do_signal_or_restart() tests whether PIF_SYSCALL is set,
which might yield wrong results.
Fix this by clearing pt_regs::flags in the entry.S irq handler
code.
Reported-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Fixes: 56e62a737028 ("s390: convert to generic entry")
Cc: <stable@vger.kernel.org> # 5.12
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/s390/kernel/entry.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 9cc71ca9a88f..e84f495e7eb2 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -418,6 +418,7 @@ ENTRY(\name) xgr %r6,%r6 xgr %r7,%r7 xgr %r10,%r10 + xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC stmg %r8,%r9,__PT_PSW(%r11) tm %r8,0x0001 # coming from user space? |