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authorTony Luck <tony.luck@intel.com>2012-05-16 13:58:29 -0700
committerTony Luck <tony.luck@intel.com>2012-05-16 13:58:29 -0700
commit7411d89535ce803404678eaf7e2f7ce095cf46b2 (patch)
tree98341b09e8e1a24639c1cb47f8e332b5811ba2ce /arch/ia64
parentc7173271f3f63738e7ec5a2f074472c5feed3518 (diff)
[IA64] Fix fast syscall version of getcpu()
GETCPU(2) says: int getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache); ... When either cpu or node is NULL nothing is written to the respective pointer. But the fast system call path had no checks for NULL, and would thus return -EFAULT if either (or both) of these were NULL. Reported-by: Mike Frysinger <vapier@gentoo.org> Tested-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/fsys.S20
1 files changed, 12 insertions, 8 deletions
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index cc26edac0ec6..e2dfae24c0f4 100644
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -559,11 +559,15 @@ ENTRY(fsys_getcpu)
;;
tnat.nz p7,p0 = r33 // I guard against NaT argument
(p7) br.cond.spnt.few .fail_einval // B
+ ;;
+ cmp.ne p6,p0=r32,r0
+ cmp.ne p7,p0=r33,r0
+ ;;
#ifdef CONFIG_NUMA
movl r17=cpu_to_node_map
;;
-EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles
-EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles
+EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles
+EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles
shladd r18=r3,1,r17
;;
ld2 r20=[r18] // r20 = cpu_to_node_map[cpu]
@@ -573,20 +577,20 @@ EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles
(p8) br.spnt.many fsys_fallback_syscall
;;
;;
-EX(.fail_efault, st4 [r32] = r3)
-EX(.fail_efault, st2 [r33] = r20)
+EX(.fail_efault, (p6) st4 [r32] = r3)
+EX(.fail_efault, (p7) st2 [r33] = r20)
mov r8=0
;;
#else
-EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles
-EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles
+EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles
+EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles
and r2 = TIF_ALLWORK_MASK,r2
;;
cmp.ne p8,p0=0,r2
(p8) br.spnt.many fsys_fallback_syscall
;;
-EX(.fail_efault, st4 [r32] = r3)
-EX(.fail_efault, st2 [r33] = r0)
+EX(.fail_efault, (p6) st4 [r32] = r3)
+EX(.fail_efault, (p7) st2 [r33] = r0)
mov r8=0
;;
#endif