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authorSven Schnelle <svens@linux.ibm.com>2021-06-11 16:08:18 +0200
committerVasily Gorbik <gor@linux.ibm.com>2021-06-21 11:19:18 +0200
commitca1f4d702d534387aa1f16379edb3b03cdb6ceda (patch)
tree38203bd018acae7d0386ae45d7e3803a04bd626e /arch/s390/kernel/entry.S
parentfc66127dc3396338f287c3b494dfbf102547e770 (diff)
s390: clear pt_regs::flags on irq entry
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>
Diffstat (limited to 'arch/s390/kernel/entry.S')
-rw-r--r--arch/s390/kernel/entry.S1
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?