crypto: talitos - HMAC SNOOP NO AFEU mode requires SW icv checking.

[android-x86/kernel.git] / ipc / shm.c

diff --git a/ipc/shm.c b/ipc/shm.c
index b626745..9c687cd 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1127,14 +1127,17 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
                goto out;
        else if ((addr = (ulong)shmaddr)) {
                if (addr & (shmlba - 1)) {
-                       /*
-                        * Round down to the nearest multiple of shmlba.
-                        * For sane do_mmap_pgoff() parameters, avoid
-                        * round downs that trigger nil-page and MAP_FIXED.
-                        */
-                       if ((shmflg & SHM_RND) && addr >= shmlba)
-                               addr &= ~(shmlba - 1);
-                       else
+                       if (shmflg & SHM_RND) {
+                               addr &= ~(shmlba - 1);  /* round down */
+
+                               /*
+                                * Ensure that the round-down is non-nil
+                                * when remapping. This can happen for
+                                * cases when addr < shmlba.
+                                */
+                               if (!addr && (shmflg & SHM_REMAP))
+                                       goto out;
+                       } else
 #ifndef __ARCH_FORCE_SHMLBA
                                if (addr & ~PAGE_MASK)
 #endif