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glibc-2.25-ldso-nodefaultdirs-option.diff
88 lines (82 loc) · 3.29 KB
/
glibc-2.25-ldso-nodefaultdirs-option.diff
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diff --git a/elf/dl-load.c b/elf/dl-load.c
index 49f070f..621b5a3 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -2279,7 +2279,8 @@ _dl_map_object (struct link_map *loader, const char *name,
/* If the loader has the DF_1_NODEFLIB flag set we must not
use a cache entry from any of these directories. */
- if (__glibc_unlikely (l->l_flags_1 & DF_1_NODEFLIB))
+ if (__glibc_unlikely (l->l_flags_1 & DF_1_NODEFLIB) ||
+ GLRO(dl_no_default_dirs))
{
const char *dirp = system_dirs;
unsigned int cnt = 0;
@@ -2321,7 +2322,8 @@ _dl_map_object (struct link_map *loader, const char *name,
/* Finally, try the default path. */
if (fd == -1
&& ((l = loader ?: GL(dl_ns)[nsid]._ns_loaded) == NULL
- || __glibc_likely (!(l->l_flags_1 & DF_1_NODEFLIB)))
+ || __glibc_likely (!(l->l_flags_1 & DF_1_NODEFLIB)) ||
+ GLRO(dl_no_default_dirs))
&& rtld_search_dirs.dirs != (void *) -1)
fd = open_path (name, namelen, mode & __RTLD_SECURE, &rtld_search_dirs,
&realname, &fb, l, LA_SER_DEFAULT, &found_other_class);
@@ -2487,7 +2489,7 @@ _dl_rtld_di_serinfo (struct link_map *loader, Dl_serinfo *si, bool counting)
a way to indicate that in the results for Dl_serinfo. */
/* Finally, try the default path. */
- if (!(loader->l_flags_1 & DF_1_NODEFLIB))
+ if (!((loader->l_flags_1 & DF_1_NODEFLIB) || GLRO(dl_no_default_dirs)))
add_path (&p, &rtld_search_dirs, XXX_default);
if (counting)
diff --git a/elf/dl-support.c b/elf/dl-support.c
index 723814a..fccc1d4 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -61,6 +61,9 @@ const char *_dl_inhibit_rpath;
/* prefix to be added to all RUNPATHs and RPATHs */
const char *_dl_rpath_prefix = NULL;
+/* flag: don't search default directories if set. */
+int _dl_no_default_dirs = 0;
+
/* The map for the object we will profile. */
struct link_map *_dl_profile_map;
diff --git a/elf/rtld.c b/elf/rtld.c
index ea3af55..75a2415 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -976,6 +976,15 @@ dl_main (const ElfW(Phdr) *phdr,
--_dl_argc;
++_dl_argv;
}
+ else if (! strcmp (_dl_argv[1], "--nodefaultdirs")
+ && _dl_argc > 2)
+ {
+ GLRO(dl_no_default_dirs) = 1;
+
+ ++_dl_skip_args;
+ --_dl_argc;
+ ++_dl_argv;
+ }
else if (! strcmp (_dl_argv[1], "--library-path")
&& _dl_argc > 2)
{
@@ -1034,6 +1043,7 @@ of this helper program; chances are you did not intend to run this program.\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\
+ --nodefaultdirs Do not search from default directories or cache\n\
--inhibit-cache Do not use " LD_SO_CACHE "\n\
--library-path PATH use given PATH instead of content of the environment\n\
variable LD_LIBRARY_PATH\n\
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 3116188..0759694 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -559,6 +559,8 @@ struct rtld_global_ro
platforms. */
EXTERN uint64_t _dl_hwcap2;
+ EXTERN int _dl_no_default_dirs;
+
#ifdef SHARED
/* We add a function table to _rtld_global which is then used to
call the function instead of going through the PLT. The result