path: root/arch/parisc/mm/fault.c
diff options
authorHelge Deller <deller@gmx.de>2016-04-08 18:32:52 +0200
committerHelge Deller <deller@gmx.de>2016-04-08 22:14:14 +0200
commit2ef4dfd9d9f288943e249b78365a69e3ea3ec072 (patch)
treeb2add375348d201853d93329c144159cf45b96ae /arch/parisc/mm/fault.c
parentparisc: Fix kernel crash with reversed copy_from_user() (diff)
parisc: Unbreak handling exceptions from kernel modules
Handling exceptions from modules never worked on parisc. It was just masked by the fact that exceptions from modules don't happen during normal use. When a module triggers an exception in get_user() we need to load the main kernel dp value before accessing the exception_data structure, and afterwards restore the original dp value of the module on exit. Noticed-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org
Diffstat (limited to '')
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 26fac9c671c9..16dbe81c97c9 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -145,6 +145,7 @@ int fixup_exception(struct pt_regs *regs)
struct exception_data *d;
d = this_cpu_ptr(&exception_data);
d->fault_ip = regs->iaoq[0];
+ d->fault_gp = regs->gr[27];
d->fault_space = regs->isr;
d->fault_addr = regs->ior;