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>

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 4263326..0f55b71 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -175,6 +175,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
 
        /* Create the ELF interpreter info */
        elf_info = (elf_addr_t *)current->mm->saved_auxv;
+       /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
 #define NEW_AUX_ENT(id, val) \
        do { \
                elf_info[ei_index++] = id; \
@@ -185,6 +186,8 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
        /* 
         * ARCH_DLINFO must come first so PPC can do its special alignment of
         * AUXV.
+        * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
+        * ARCH_DLINFO changes
         */
        ARCH_DLINFO;
 #endif

diff --git a/include/asm-alpha/elf.h b/include/asm-alpha/elf.h
index 6c2d78f..4b518e3 100644 (file)
--- a/include/asm-alpha/elf.h
+++ b/include/asm-alpha/elf.h
@@ -155,6 +155,7 @@ extern int alpha_l1d_cacheshape;
 extern int alpha_l2_cacheshape;
 extern int alpha_l3_cacheshape;
 
+/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 #define ARCH_DLINFO                                            \
   do {                                                         \
     NEW_AUX_ENT(AT_L1I_CACHESHAPE, alpha_l1i_cacheshape);      \

diff --git a/include/asm-alpha/system.h b/include/asm-alpha/system.h
index 620c4d8..fd9dc88 100644 (file)
--- a/include/asm-alpha/system.h
+++ b/include/asm-alpha/system.h
@@ -48,6 +48,7 @@
 
 #ifndef __ASSEMBLY__
 #include <linux/kernel.h>
+#define AT_VECTOR_SIZE_ARCH 4 /* entries in ARCH_DLINFO */
 
 /*
  * This is the logout header that should be common to all platforms

diff --git a/include/asm-ia64/elf.h b/include/asm-ia64/elf.h
index 25f9835..f10e29b 100644 (file)
--- 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 91bb8e0..595112b 100644 (file)
--- 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 */

diff --git a/include/asm-powerpc/elf.h b/include/asm-powerpc/elf.h
index 8925c28..6bd07ef 100644 (file)
--- a/include/asm-powerpc/elf.h
+++ b/include/asm-powerpc/elf.h
@@ -291,6 +291,7 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm,
  *   AT_IGNOREPPC is used for that.
  * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
  *   even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
+ * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes
  */
 #define ARCH_DLINFO                                                    \
 do {                                                                   \

diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index d10e99b..87be8c3 100644 (file)
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -40,6 +40,7 @@
 #define set_mb(var, value)     do { var = value; mb(); } while (0)
 
 #ifdef __KERNEL__
+#define AT_VECTOR_SIZE_ARCH 6 /* entries in ARCH_DLINFO */
 #ifdef CONFIG_SMP
 #define smp_mb()       mb()
 #define smp_rmb()      rmb()

diff --git a/include/asm-sh/elf.h b/include/asm-sh/elf.h
index 43ca244..12cc4b3 100644 (file)
--- a/include/asm-sh/elf.h
+++ b/include/asm-sh/elf.h
@@ -133,6 +133,7 @@ extern void __kernel_vsyscall;
 #define VDSO_BASE              ((unsigned long)current->mm->context.vdso)
 #define VDSO_SYM(x)            (VDSO_BASE + (unsigned long)(x))
 
+/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 #define ARCH_DLINFO                                            \
 do {                                                           \
        if (vdso_enabled)                                       \

diff --git a/include/asm-sh/system.h b/include/asm-sh/system.h
index 9d849e6..4faa2fb 100644 (file)
--- a/include/asm-sh/system.h
+++ b/include/asm-sh/system.h
@@ -15,6 +15,7 @@
 struct task_struct *__switch_to(struct task_struct *prev,
                                struct task_struct *next);
 
+#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
 /*
  *     switch_to() should switch tasks to task nr n, first
  */

diff --git a/include/asm-x86/elf_32.h b/include/asm-x86/elf_32.h
index af45f31..b3f694e 100644 (file)
--- a/include/asm-x86/elf_32.h
+++ b/include/asm-x86/elf_32.h
@@ -153,6 +153,7 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 
 extern unsigned int vdso_enabled;
 
+/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 #define ARCH_DLINFO                                                    \
 do if (vdso_enabled) {                                                 \
                NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \

diff --git a/include/asm-x86/system_32.h b/include/asm-x86/system_32.h
index e7e5d42..d84e593 100644 (file)
--- a/include/asm-x86/system_32.h
+++ b/include/asm-x86/system_32.h
@@ -7,6 +7,7 @@
 #include <asm/cmpxchg.h>
 
 #ifdef __KERNEL__
+#define AT_VECTOR_SIZE_ARCH 2 /* entries in ARCH_DLINFO */
 
 struct task_struct;    /* one of the stranger aspects of C forward declarations.. */
 extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struct task_struct *next));

diff --git a/include/linux/auxvec.h b/include/linux/auxvec.h
index d2bc0d6..ad89545 100644 (file)
--- a/include/linux/auxvec.h
+++ b/include/linux/auxvec.h
@@ -26,6 +26,8 @@
 
 #define AT_SECURE 23   /* secure mode boolean */
 
-#define AT_VECTOR_SIZE  44 /* Size of auxiliary table.  */
+#ifdef __KERNEL__
+#define AT_VECTOR_SIZE_BASE (14 + 2) /* NEW_AUX_ENT entries in auxiliary table */
+#endif
 
 #endif /* _LINUX_AUXVEC_H */

diff --git a/include/linux/elf.h b/include/linux/elf.h
index 0eb9ed2..576e83b 100644 (file)
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -2,7 +2,6 @@
 #define _LINUX_ELF_H
 
 #include <linux/types.h>
-#include <linux/auxvec.h>
 #include <linux/elf-em.h>
 #include <asm/elf.h>
 

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 8776679..f4c03e0 100644 (file)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1,7 +1,7 @@
 #ifndef _LINUX_MM_TYPES_H
 #define _LINUX_MM_TYPES_H
 
-#include <linux/auxvec.h>      /* For AT_VECTOR_SIZE */
+#include <linux/auxvec.h>
 #include <linux/types.h>
 #include <linux/threads.h>
 #include <linux/list.h>
@@ -13,6 +13,11 @@
 #include <asm/page.h>
 #include <asm/mmu.h>
 
+#ifndef AT_VECTOR_SIZE_ARCH
+#define AT_VECTOR_SIZE_ARCH 0
+#endif
+#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
+
 struct address_space;
 
 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS