x86, smap: smap_violation() is bogus if CONFIG_X86_SMAP is off

commit 4640c7ee9b8953237d05a61ea3ea93981d1bc961 upstream.

If CONFIG_X86_SMAP is disabled, smap_violation() tests for conditions
which are incorrect (as the AC flag doesn't matter), causing spurious
faults.

The dynamic disabling of SMAP (nosmap on the command line) is fine
because it disables X86_FEATURE_SMAP, therefore causing the
static_cpu_has() to return false.

Found by Fengguang Wu's test system.

[ v3: move all predicates into smap_violation() ]
[ v2: use IS_ENABLED() instead of #ifdef ]

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/20140213124550.GA30497@localhost
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 3aaeffcfd67a6d9ae3b3e89514fed55c31e2ea4d..d8b1ff68dbb9366692ba2502286172692fb36ef5 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -980,6 +980,12 @@ static int fault_in_kernel_space(unsigned long address)
 
 static inline bool smap_violation(int error_code, struct pt_regs *regs)
 {
+       if (!IS_ENABLED(CONFIG_X86_SMAP))
+               return false;
+
+       if (!static_cpu_has(X86_FEATURE_SMAP))
+               return false;
+
        if (error_code & PF_USER)
                return false;
 
@@ -1081,11 +1087,9 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code)
        if (unlikely(error_code & PF_RSVD))
                pgtable_bad(regs, error_code, address);
 
-       if (static_cpu_has(X86_FEATURE_SMAP)) {
-               if (unlikely(smap_violation(error_code, regs))) {
-                       bad_area_nosemaphore(regs, error_code, address);
-                       return;
-               }
+       if (unlikely(smap_violation(error_code, regs))) {
+               bad_area_nosemaphore(regs, error_code, address);
+               return;
        }
 
        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);