From: Heiko Carstens <hca@xxxxxxxxxxxxx>
commit 4734406c39238cbeafe66f0060084caa3247ff53 upstream.
With the recent rewrite of the fpu code exception handling for the
lfpc instruction within load_fpu_state() was erroneously removed.
Add it again to prevent that loading invalid floating point register
values cause an unhandled specification exception.
Fixes: 8c09871a950a ("s390/fpu: limit save and restore to used registers")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Aristeu Rozanski <aris@xxxxxxxxxx>
Tested-by: Aristeu Rozanski <aris@xxxxxxxxxx>
Reviewed-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/fpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/kernel/fpu.c b/arch/s390/kernel/fpu.c
index fa90bbdc5ef9..6f2e87920288 100644
--- a/arch/s390/kernel/fpu.c
+++ b/arch/s390/kernel/fpu.c
@@ -113,7 +113,7 @@ void load_fpu_state(struct fpu *state, int flags)
int mask;
if (flags & KERNEL_FPC)
- fpu_lfpc(&state->fpc);
+ fpu_lfpc_safe(&state->fpc);
if (!cpu_has_vx()) {
if (flags & KERNEL_VXR_V0V7)
load_fp_regs_vx(state->vxrs);
--
2.46.0
Patches currently in stable-queue which might be from hca@xxxxxxxxxxxxx are
queue-6.10/s390-fpu-re-add-exception-handling-in-load_fpu_state.patch
queue-6.10/s390-mm-ptdump-fix-handling-of-identity-mapping-area.patch
