increase AT_VECTOR_SIZE to terminate saved_auxv properly

include/asm-powerpc/elf.h has 6 entries in ARCH_DLINFO.  fs/binfmt_elf.c
has 14 unconditional NEW_AUX_ENT entries and 2 conditional NEW_AUX_ENT
entries.  So in the worst case, saved_auxv does not get an AT_NULL entry at
the end.

The saved_auxv array must be terminated with an AT_NULL entry.  Make the
size of mm_struct->saved_auxv arch dependend, based on the number of
ARCH_DLINFO entries.

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jakub Jelinek <jakub@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-ia64/elf.h b/include/asm-ia64/elf.h
index 25f9835d5459..f10e29b60b00 100644
--- a/include/asm-ia64/elf.h
+++ b/include/asm-ia64/elf.h
@@ -192,6 +192,7 @@ extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
 
 #define GATE_EHDR       ((const struct elfhdr *) GATE_ADDR)
 
+/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 #define ARCH_DLINFO                                                             \
 do {                                                                            \
         extern char __kernel_syscall_via_epc[];                                 \
diff --git a/include/asm-ia64/system.h b/include/asm-ia64/system.h
index 91bb8e00066c..595112bca3cc 100644
--- a/include/asm-ia64/system.h
+++ b/include/asm-ia64/system.h
@@ -32,6 +32,8 @@
 #include <linux/kernel.h>
 #include <linux/types.h>
 
+#define AT_VECTOR_SIZE_ARCH 2 /* entries in ARCH_DLINFO */
+
 struct pci_vector_struct {
         __u16 segment;  /* PCI Segment number */
         __u16 bus;      /* PCI Bus number */