eglibc: relocatable SDK changes
Modifying the dynamic loader path in all binaries by the SDK installer would not be possible because we cannot know in advance the SDK target location. Hence, the PT_INTERP section size has been set to 4096 (which is the maximum path lengh in Linux). Also, for the dynamic loader SYSDIRS and ld.so.cache paths, special 4096 bytes sections were allocated so that we can easily parse the ELF binary at install time and modify the paths. (From OE-Core rev: 6be55d36333e0c81a4926332d036246d28d995c4) Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Laurentiu Palcu
Richard Purdie
parent
e172be54cf
commit
e81441a92f
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@ -0,0 +1,81 @@
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Upstream-Status: Inappropriate [SDK specific]
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This patch puts the dynamic loader path in the binaries, SYSTEM_DIRS strings
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and lengths as well as ld.so.cache path in the dynamic loader to specific
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sections in memory. The sections that contain paths have been allocated a 4096
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byte section, which is the maximum path length in linux. This will allow the
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relocating script to parse the ELF binary, detect the section and easily replace
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the strings in a certain path.
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Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
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Index: libc/elf/interp.c
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===================================================================
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--- libc.orig/elf/interp.c
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+++ libc/elf/interp.c
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@@ -17,5 +17,5 @@
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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-const char __invoke_dynamic_linker__[] __attribute__ ((section (".interp")))
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+const char __invoke_dynamic_linker__[4096] __attribute__ ((section (".interp")))
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= RUNTIME_LINKER;
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Index: libc/elf/dl-load.c
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===================================================================
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--- libc.orig/elf/dl-load.c
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+++ libc/elf/dl-load.c
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@@ -145,8 +145,8 @@ static size_t max_capstrlen attribute_re
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/* Get the generated information about the trusted directories. */
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#include "trusted-dirs.h"
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-static const char system_dirs[] = SYSTEM_DIRS;
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-static const size_t system_dirs_len[] =
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+static const char system_dirs[4096] __attribute__ ((section (".sysdirs"))) = SYSTEM_DIRS;
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+volatile static const size_t system_dirs_len[] __attribute__ ((section (".sysdirslen"))) =
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{
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SYSTEM_DIRS_LEN
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};
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Index: libc/elf/dl-cache.c
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===================================================================
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--- libc.orig/elf/dl-cache.c
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+++ libc/elf/dl-cache.c
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@@ -134,6 +134,10 @@ do \
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while (0)
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+const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache"))) =
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+ SYSCONFDIR "/ld.so.cache";
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+
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+
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int
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internal_function
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_dl_cache_libcmp (const char *p1, const char *p2)
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Index: libc/elf/ldconfig.c
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===================================================================
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--- libc.orig/elf/ldconfig.c
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+++ libc/elf/ldconfig.c
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@@ -167,6 +167,9 @@ static struct argp argp =
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options, parse_opt, NULL, doc, NULL, more_help, NULL
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};
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+
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+extern const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache")));
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+
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/* Check if string corresponds to an important hardware capability or
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a platform. */
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static int
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Index: libc/sysdeps/generic/dl-cache.h
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===================================================================
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--- libc.orig/sysdeps/generic/dl-cache.h
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+++ libc/sysdeps/generic/dl-cache.h
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@@ -28,10 +28,6 @@
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((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID)
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#endif
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-#ifndef LD_SO_CACHE
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-# define LD_SO_CACHE SYSCONFDIR "/ld.so.cache"
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-#endif
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-
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#ifndef add_system_dir
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# define add_system_dir(dir) add_dir (dir)
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#endif
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@ -0,0 +1,108 @@
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Upstream-Status: Inappropriate [SDK specific]
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This patch puts the dynamic loader path in the binaries, SYSTEM_DIRS strings
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and lengths as well as ld.so.cache path in the dynamic loader to specific
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sections in memory. The sections that contain paths have been allocated a 4096
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byte section, which is the maximum path length in linux. This will allow the
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relocating script to parse the ELF binary, detect the section and easily replace
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the strings in a certain path.
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Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
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Index: libc/elf/interp.c
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===================================================================
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--- libc.orig/elf/interp.c
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+++ libc/elf/interp.c
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@@ -16,5 +16,5 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-const char __invoke_dynamic_linker__[] __attribute__ ((section (".interp")))
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+const char __invoke_dynamic_linker__[4096] __attribute__ ((section (".interp")))
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= RUNTIME_LINKER;
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Index: libc/elf/dl-load.c
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===================================================================
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--- libc.orig/elf/dl-load.c
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+++ libc/elf/dl-load.c
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@@ -144,8 +144,8 @@ static size_t max_capstrlen attribute_re
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/* Get the generated information about the trusted directories. */
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#include "trusted-dirs.h"
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-static const char system_dirs[] = SYSTEM_DIRS;
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-static const size_t system_dirs_len[] =
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+static const char system_dirs[4096] __attribute__ ((section (".sysdirs"))) = SYSTEM_DIRS;
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+volatile static const size_t system_dirs_len[] __attribute__ ((section (".sysdirslen"))) =
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{
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SYSTEM_DIRS_LEN
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};
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Index: libc/elf/dl-cache.c
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===================================================================
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--- libc.orig/elf/dl-cache.c
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+++ libc/elf/dl-cache.c
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@@ -133,6 +133,10 @@ do \
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while (0)
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+const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache"))) =
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+ SYSCONFDIR "/ld.so.cache";
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+
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+
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int
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internal_function
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_dl_cache_libcmp (const char *p1, const char *p2)
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Index: libc/elf/ldconfig.c
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===================================================================
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--- libc.orig/elf/ldconfig.c
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+++ libc/elf/ldconfig.c
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@@ -166,6 +166,9 @@ static struct argp argp =
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options, parse_opt, NULL, doc, NULL, more_help, NULL
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};
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+
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+extern const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache")));
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+
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/* Check if string corresponds to an important hardware capability or
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a platform. */
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static int
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Index: libc/sysdeps/generic/dl-cache.h
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===================================================================
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--- libc.orig/sysdeps/generic/dl-cache.h
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+++ libc/sysdeps/generic/dl-cache.h
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@@ -27,10 +27,6 @@
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((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID)
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#endif
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-#ifndef LD_SO_CACHE
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-# define LD_SO_CACHE SYSCONFDIR "/ld.so.cache"
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-#endif
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-
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#ifndef add_system_dir
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# define add_system_dir(dir) add_dir (dir)
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#endif
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Index: libc/elf/rtld.c
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===================================================================
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--- libc.orig/elf/rtld.c
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+++ libc/elf/rtld.c
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@@ -99,6 +99,7 @@ uintptr_t __pointer_chk_guard_local
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strong_alias (__pointer_chk_guard_local, __pointer_chk_guard)
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#endif
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+extern const char LD_SO_CACHE[4096] __attribute__ ((section (".ldsocache")));
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/* List of auditing DSOs. */
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static struct audit_list
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@@ -1031,12 +1032,12 @@ of this helper program; chances are you
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--list list all dependencies and how they are resolved\n\
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--verify verify that given object really is a dynamically linked\n\
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object we can handle\n\
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- --inhibit-cache Do not use " LD_SO_CACHE "\n\
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+ --inhibit-cache Do not use %s\n\
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--library-path PATH use given PATH instead of content of the environment\n\
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variable LD_LIBRARY_PATH\n\
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--inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\
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in LIST\n\
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- --audit LIST use objects named in LIST as auditors\n");
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+ --audit LIST use objects named in LIST as auditors\n", LD_SO_CACHE);
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++_dl_skip_args;
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--_dl_argc;
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@ -3,7 +3,7 @@ require eglibc.inc
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SRCREV = "19294"
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DEPENDS += "gperf-native"
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PR = "r12"
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PR = "r13"
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PR_append = "+svnr${SRCPV}"
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EGLIBC_BRANCH="eglibc-2_15"
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@ -33,7 +33,9 @@ LIC_FILES_CHKSUM = "file://LICENSES;md5=98a1128c4b58120182cbea3b1752d8b9 \
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file://posix/rxspencer/COPYRIGHT;md5=dc5485bb394a13b2332ec1c785f5d83a \
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file://COPYING.LIB;md5=bbb461211a33b134d42ed5ee802b37ff "
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SRC_URI_append_virtclass-nativesdk = " file://ld-search-order.patch"
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SRC_URI_append_virtclass-nativesdk = " file://ld-search-order.patch \
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file://relocatable_sdk.patch \
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"
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S = "${WORKDIR}/${EGLIBC_BRANCH}/libc"
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B = "${WORKDIR}/build-${TARGET_SYS}"
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@ -3,7 +3,7 @@ require eglibc.inc
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SRCREV = "19383"
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DEPENDS += "gperf-native"
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PR = "r4"
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PR = "r5"
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PR_append = "+svnr${SRCPV}"
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EGLIBC_BRANCH="eglibc-2_16"
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@ -31,7 +31,9 @@ LIC_FILES_CHKSUM = "file://LICENSES;md5=98a1128c4b58120182cbea3b1752d8b9 \
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file://posix/rxspencer/COPYRIGHT;md5=dc5485bb394a13b2332ec1c785f5d83a \
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file://COPYING.LIB;md5=bbb461211a33b134d42ed5ee802b37ff "
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SRC_URI_append_virtclass-nativesdk = " file://ld-search-order.patch"
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SRC_URI_append_virtclass-nativesdk = " file://ld-search-order.patch \
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file://relocatable_sdk.patch \
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"
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S = "${WORKDIR}/${EGLIBC_BRANCH}/libc"
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B = "${WORKDIR}/build-${TARGET_SYS}"
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