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| author |   Tony Luck <tony.luck@intel.com> | 2012-05-16 13:58:29 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2012-05-16 13:58:29 -0700 |
| commit | 7411d89535ce803404678eaf7e2f7ce095cf46b2 (patch) | |
| tree | 98341b09e8e1a24639c1cb47f8e332b5811ba2ce /arch/ia64/kernel/fsys.S | |
| parent | [IA64] Removed "task_size" element from thread_struct - it is now constant (diff) | |
| download | linux-dev-7411d89535ce803404678eaf7e2f7ce095cf46b2.tar.xz linux-dev-7411d89535ce803404678eaf7e2f7ce095cf46b2.zip | |
[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/kernel/fsys.S')
| -rw-r--r-- | arch/ia64/kernel/fsys.S | 20 |
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 |