[src/trunk]: src/sys Define ELF_MAXNOTESIZE, ELF_MAXSHNUM and ELF_MAXPHNUM in...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d4f9532e4129
branches:  trunk
changeset: 797192:d4f9532e4129
user:      maxv <maxv%NetBSD.org@localhost>
date:      Tue Jul 08 17:16:25 2014 +0000

description:
Define ELF_MAXNOTESIZE, ELF_MAXSHNUM and ELF_MAXPHNUM in <sys/exec_elf.h>, so
that it can be used externally.

diffstat:

 sys/kern/exec_elf.c |  21 +++++++--------------
 sys/sys/exec_elf.h  |   9 ++++++++-
 2 files changed, 15 insertions(+), 15 deletions(-)

diffs (97 lines):

diff -r 8cc9083872c7 -r d4f9532e4129 sys/kern/exec_elf.c
--- a/sys/kern/exec_elf.c       Tue Jul 08 17:15:14 2014 +0000
+++ b/sys/kern/exec_elf.c       Tue Jul 08 17:16:25 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: exec_elf.c,v 1.68 2014/07/06 07:41:41 maxv Exp $       */
+/*     $NetBSD: exec_elf.c,v 1.69 2014/07/08 17:16:25 maxv Exp $       */
 
 /*-
  * Copyright (c) 1994, 2000, 2005 The NetBSD Foundation, Inc.
@@ -57,7 +57,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: exec_elf.c,v 1.68 2014/07/06 07:41:41 maxv Exp $");
+__KERNEL_RCSID(1, "$NetBSD: exec_elf.c,v 1.69 2014/07/08 17:16:25 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_pax.h"
@@ -115,13 +115,6 @@
 #define        ELF_ROUND(a, b)         (((a) + (b) - 1) & ~((b) - 1))
 #define        ELF_TRUNC(a, b)         ((a) & ~((b) - 1))
 
-/*
- * Arbitrary limits to avoid DoS for excessive memory allocation.
- */
-#define MAXPHNUM       128
-#define MAXSHNUM       32768
-#define MAXNOTESIZE    1024
-
 static void
 elf_placedynexec(struct lwp *l, struct exec_package *epp, Elf_Ehdr *eh,
     Elf_Phdr *ph)
@@ -304,7 +297,7 @@
        if (ELF_EHDR_FLAGS_OK(eh) == 0)
                return ENOEXEC;
 
-       if (eh->e_shnum > MAXSHNUM || eh->e_phnum > MAXPHNUM)
+       if (eh->e_shnum > ELF_MAXSHNUM || eh->e_phnum > ELF_MAXPHNUM)
                return ENOEXEC;
 
        return 0;
@@ -882,7 +875,7 @@
 #endif
 
        epp->ep_pax_flags = 0;
-       if (eh->e_shnum > MAXSHNUM || eh->e_shnum == 0)
+       if (eh->e_shnum > ELF_MAXSHNUM || eh->e_shnum == 0)
                return ENOEXEC;
 
        shsize = eh->e_shnum * sizeof(Elf_Shdr);
@@ -891,12 +884,12 @@
        if (error)
                goto out;
 
-       np = kmem_alloc(MAXNOTESIZE, KM_SLEEP);
+       np = kmem_alloc(ELF_MAXNOTESIZE, KM_SLEEP);
        for (i = 0; i < eh->e_shnum; i++) {
                Elf_Shdr *shp = &sh[i];
 
                if (shp->sh_type != SHT_NOTE ||
-                   shp->sh_size > MAXNOTESIZE ||
+                   shp->sh_size > ELF_MAXNOTESIZE ||
                    shp->sh_size < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ)
                        continue;
 
@@ -1035,7 +1028,7 @@
                        break;
                }
        }
-       kmem_free(np, MAXNOTESIZE);
+       kmem_free(np, ELF_MAXNOTESIZE);
 
        error = isnetbsd ? 0 : ENOEXEC;
 out:
diff -r 8cc9083872c7 -r d4f9532e4129 sys/sys/exec_elf.h
--- a/sys/sys/exec_elf.h        Tue Jul 08 17:15:14 2014 +0000
+++ b/sys/sys/exec_elf.h        Tue Jul 08 17:16:25 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: exec_elf.h,v 1.140 2014/03/09 17:59:19 christos Exp $  */
+/*     $NetBSD: exec_elf.h,v 1.141 2014/07/08 17:16:25 maxv Exp $      */
 
 /*-
  * Copyright (c) 1994 The NetBSD Foundation, Inc.
@@ -1225,6 +1225,13 @@
 
 #ifdef _KERNEL
 
+/*
+ * Arbitrary limits to avoid DoS for excessive memory allocation.
+ */
+#define ELF_MAXPHNUM   128
+#define ELF_MAXSHNUM   32768
+#define ELF_MAXNOTESIZE        1024
+
 #define ELF_AUX_ENTRIES 15     /* Max size of aux array passed to loader */
 #define ELF32_NO_ADDR  (~(Elf32_Addr)0) /* Indicates addr. not yet filled in */
 #define ELF32_LINK_ADDR ((Elf32_Addr)-2) /* advises to use link address */