Commit ca1f4d70 authored by Sven Schnelle's avatar Sven Schnelle Committed by Vasily Gorbik
Browse files

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: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarSven Schnelle <svens@linux.ibm.com>
Reviewed-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Fixes: 56e62a73 ("s390: convert to generic entry")
Cc: <stable@vger.kernel.org> # 5.12
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent fc66127d

arch/s390/kernel/entry.S

+1 −0
Original line number Diff line number Diff line
@@ -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?