From 49caf586b80ba030a0ee4af9f6128ff2979ea636 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 18 Mar 2015 01:51:38 +0000
Subject: [PATCH] nativesdk-glibc: Raise the size of arrays containing dl paths

This patch puts the dynamic loader path in the binaries, SYSTEM_DIRS strings
and lengths as well as ld.so.cache path in the dynamic loader to specific
sections in memory. The sections that contain paths have been allocated a 4096
byte section, which is the maximum path length in linux. This will allow the
relocating script to parse the ELF binary, detect the section and easily replace
the strings in a certain path.

Upstream-Status: Inappropriate [SDK specific]

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 elf/dl-cache.c             | 4 ++++
 elf/dl-load.c              | 4 ++--
 elf/dl-usage.c             | 6 ++++--
 elf/interp.c               | 2 +-
 elf/ldconfig.c             | 2 ++
 elf/rtld.c                 | 1 +
 iconv/gconv_conf.c         | 2 +-
 sysdeps/generic/dl-cache.h | 4 ----
 8 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/elf/dl-cache.c b/elf/dl-cache.c
index 85f3f179ed..cc55887c56 100644
--- a/elf/dl-cache.c
+++ b/elf/dl-cache.c
@@ -352,6 +352,10 @@ search_cache (const char *string_table, uint32_t string_table_size,
   return best;
 }
 
+const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache"))) =
+		SYSCONFDIR "/ld.so.cache";
+
+
 int
 _dl_cache_libcmp (const char *p1, const char *p2)
 {
diff --git a/elf/dl-load.c b/elf/dl-load.c
index c4a543fb00..27fb70f09b 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -117,8 +117,8 @@ enum { ncapstr = 1, max_capstrlen = 0 };
    gen-trusted-dirs.awk.  */
 #include "trusted-dirs.h"
 
-static const char system_dirs[] = SYSTEM_DIRS;
-static const size_t system_dirs_len[] =
+static const char system_dirs[4096] __attribute__ ((section (".sysdirs"))) = SYSTEM_DIRS;
+volatile static const size_t system_dirs_len[] __attribute__ ((section (".sysdirslen"))) =
 {
   SYSTEM_DIRS_LEN
 };
diff --git a/elf/dl-usage.c b/elf/dl-usage.c
index 5baac4ba8e..60097ad0e2 100644
--- a/elf/dl-usage.c
+++ b/elf/dl-usage.c
@@ -25,6 +25,8 @@
 #include <dl-procinfo.h>
 #include <dl-hwcaps.h>
 
+extern const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache")));
+
 void
 _dl_usage (const char *argv0, const char *wrong_option)
 {
@@ -185,7 +187,7 @@ setting environment variables (which would be inherited by subprocesses).\n\
   --list                list all dependencies and how they are resolved\n\
   --verify              verify that given object really is a dynamically linked\n\
                         object we can handle\n\
-  --inhibit-cache       Do not use " LD_SO_CACHE "\n\
+  --inhibit-cache       Do not use %s\n\
   --library-path PATH   use given PATH instead of content of the environment\n\
                         variable LD_LIBRARY_PATH\n\
   --glibc-hwcaps-prepend LIST\n\
@@ -204,7 +206,7 @@ setting environment variables (which would be inherited by subprocesses).\n\
 \n\
 This program interpreter self-identifies as: " RTLD "\n\
 ",
-              argv0);
+              argv0, LD_SO_CACHE);
   print_search_path_for_help (state);
   print_hwcaps_subdirectories (state);
   _exit (EXIT_SUCCESS);
diff --git a/elf/interp.c b/elf/interp.c
index 8b705824bf..7d094829f3 100644
--- a/elf/interp.c
+++ b/elf/interp.c
@@ -18,5 +18,5 @@
 
 #include <runtime-linker.h>
 
-const char __invoke_dynamic_linker__[] __attribute__ ((section (".interp")))
+const char __invoke_dynamic_linker__[4096] __attribute__ ((section (".interp")))
   = RUNTIME_LINKER;
diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index b64c54b53e..caf7001745 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -150,6 +150,8 @@ static struct argp argp =
   options, parse_opt, NULL, doc, NULL, more_help, NULL
 };
 
+extern const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache")));
+
 /* Handle program arguments.  */
 static error_t
 parse_opt (int key, char *arg, struct argp_state *state)
diff --git a/elf/rtld.c b/elf/rtld.c
index 4f494b792e..d1c1252188 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -190,6 +190,7 @@ dso_name_valid_for_suid (const char *p)
     }
   return *p != '\0';
 }
+extern const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache")));
 
 static void
 audit_list_init (struct audit_list *list)
diff --git a/iconv/gconv_conf.c b/iconv/gconv_conf.c
index 1063c31a2b..57fa832e52 100644
--- a/iconv/gconv_conf.c
+++ b/iconv/gconv_conf.c
@@ -35,7 +35,7 @@
 #include <gconv_parseconfdir.h>
 
 /* This is the default path where we look for module lists.  */
-static const char default_gconv_path[] = GCONV_PATH;
+static char default_gconv_path[4096] __attribute__ ((section (".gccrelocprefix"))) = GCONV_PATH;
 
 /* Type to represent search path.  */
 struct path_elem
diff --git a/sysdeps/generic/dl-cache.h b/sysdeps/generic/dl-cache.h
index 919e49ffc8..cd3f8ba94b 100644
--- a/sysdeps/generic/dl-cache.h
+++ b/sysdeps/generic/dl-cache.h
@@ -34,10 +34,6 @@
   ((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID)
 #endif
 
-#ifndef LD_SO_CACHE
-# define LD_SO_CACHE SYSCONFDIR "/ld.so.cache"
-#endif
-
 #ifndef add_system_dir
 # define add_system_dir(dir) add_dir (dir)
 #endif
