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authorRoland McGrath <roland@gnu.org>1996-07-14 06:04:09 +0000
committerRoland McGrath <roland@gnu.org>1996-07-14 06:04:09 +0000
commit2064087b5f1a0a3a189fcd6a3012376f5545be31 (patch)
tree6f02a4e4364004352f2d785146b5dc12444e83b9 /elf
parent842907c6f8e6022f443175072e65bc516eb0973b (diff)
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Sun Jul 14 01:51:39 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>cvs/libc-960714
* manual/Makefile (glibc-targets): Variable and targets removed. Sat Jul 13 23:50:17 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * manual/Makefile (lib): New phony target. Depend on stamp files. ($(objpfx)stamp%-$(subdir)): New rule to create them when necessary. 1996-07-13 Paul Eggert <eggert@twinsun.com> * time/strftime.c (strftime): Use space padding for %e, %k, %l, to match Emacs format-time-string specification. (DO_NUMBER_SPACEPAD): Renamed from DO_NUMBER_NOPAD. Sat Jul 13 20:17:38 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * elf/dl-deps.c (_dl_map_object_deps): Take new args PRELOADS and NPRELOADS, vector of `struct link_map *'s; add them to the searchlist between MAP and its deps. * elf/link.h: Fix decl. * elf/rtld.c (dl_main): If not secure, parse LD_PRELOAD for colon-separated list of names, map those and pass vector of ptrs as PRELOADS list to _dl_map_object_deps. * elf/dl-runtime.c (_dl_object_relocation_scope): Pass new args to _dl_map_object_deps with empty preload list. * elf/dl-open.c (_dl_open): Likewise. * sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_open_zero_fill): Function removed. (__mmap): Pass MACH_PORT_NULL for memobj port when (flags & MAP_ANON). * sysdeps/generic/dl-sysdep.c (_dl_sysdep_open_zero_fill): Conditionalize defn on [! MAP_ANON]. * elf/dl-minimal.c (malloc): Conditionalize use of _dl_zerofd on [! MAP_ANON]. * elf/rtld.c (dl_main): Likewise. * elf/dl-load.c (_dl_zerofd): Conditionalize defn on [! MAP_ANON]. (_dl_map_object_from_fd): Conditionalize initialization of _dl_zerofd. * elf/dl-fini.c (_dl_fini): Skip finalizer for executable itself. Sat Jul 13 02:47:53 1996 David Mosberger-Tang <davidm@azstarnet.com> * stdlib/random.c (__random): Declare as int32_t to be in sync with declaration. * socket/Makefile (headers): Add socketbits.h. * misc/mntent.c (endmntent): Allow for NULL stream. SunOS does it that way. * grp/initgroups.c (initgroups): Add groups that user is a member of, not the ones he is _not_ a member of. * nss/nsswitch.c (known_compare): Make known_compare() a static instead of a local function. The latter are difficult to debug and slow to execute on certain platforms. * sysdeps/posix/ttyname_r.c (ttyname_r): Use sizeof (dev) - 1 in place of sizeof (dev). The size of a literal string includes the NUL byte. * sysdeps/unix/getlogin.c (getlogin): Initialize ut_fd with -1. Thu Jul 11 16:59:10 1996 David Mosberger-Tang <davidm@azstarnet.com> * misc/mntent.c (addmntent): Seek to end of file before writing entry. Return 1 on error, not -1. Tue Jul 9 19:08:05 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/syscalls.list: Mark bdflush as EXTRA syscall. Fri Jul 5 18:44:55 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/ioperm.c (port_to_cpu_addr): Size shift amount for Jensen must be 5 not 4. Sat Jul 13 20:04:28 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * socket/sys/socket.h (struct osockaddr): New type. Sat Jul 13 03:50:53 1996 Ulrich Drepper <drepper@cygnus.com> * misc/Makefile (routines): Add qefgcvt and qefgcvt_r. * misc/efgcvt.c, misc/efgcvt_r.c: Change code so that the `double' and `long double' versions can be generated. * misc/qefgcvt.c, misc/qefgcvt_r.c: New files. Define macros so that included efgcvt{,_r}.c file generate `long double' versions. * stdlib/stdlib.h: Add prototypes for q[efg]cvt() and q[ef]cvt_r() functions. * manual/startup.texi: Document new getsubopt function. * manual/examples/subopt.c: New example program for documenting getsubopt function. Fri Jul 12 23:58:37 1996 Ulrich Drepper <drepper@cygnus.com> * stdlib/Makefile (routines): Add getsubopt. * stdlib/stdlib.h: Add prototype for getsubopt. * stdlib/getsubopt.c: New file. Implement getsubopt function to handle suboption parsing.
Diffstat (limited to 'elf')
-rw-r--r--elf/dl-deps.c23
-rw-r--r--elf/dl-fini.c6
-rw-r--r--elf/dl-load.c12
-rw-r--r--elf/dl-minimal.c11
-rw-r--r--elf/dl-open.c2
-rw-r--r--elf/dl-runtime.c2
-rw-r--r--elf/link.h10
-rw-r--r--elf/rtld.c47
8 files changed, 93 insertions, 20 deletions
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index 9fe974d..28733ab 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -23,20 +23,29 @@ Cambridge, MA 02139, USA. */
#include <stdlib.h>
void
-_dl_map_object_deps (struct link_map *map)
+_dl_map_object_deps (struct link_map *map,
+ struct link_map **preloads, unsigned int npreloads)
{
struct list
{
struct link_map *map;
struct list *next;
};
- struct list head, *tailp, *scanp;
+ struct list head[1 + npreloads], *tailp, *scanp;
unsigned int nlist;
/* Start the search list with one element: MAP itself. */
- head.map = map;
- head.next = NULL;
- nlist = 1;
+ head[0].map = map;
+
+ /* Add the preloaded items after MAP but before any of its dependencies. */
+ for (nlist = 0; nlist < npreloads; ++nlist)
+ {
+ head[nlist].next = &head[nlist + 1];
+ head[nlist + 1].map = preloads[nlist];
+ }
+
+ /* Terminate the list. */
+ head[nlist++].next = NULL;
/* We use `l_reserved' as a mark bit to detect objects we have already
put in the search list and avoid adding duplicate elements later in
@@ -47,7 +56,7 @@ _dl_map_object_deps (struct link_map *map)
dependencies and appending them to the list as we step through it.
This produces a flat, ordered list that represents a breadth-first
search of the dependency tree. */
- for (scanp = tailp = &head; scanp; scanp = scanp->next)
+ for (scanp = tailp = head; scanp; scanp = scanp->next)
{
struct link_map *l = scanp->map;
@@ -91,7 +100,7 @@ _dl_map_object_deps (struct link_map *map)
map->l_nsearchlist = nlist;
nlist = 0;
- for (scanp = &head; scanp; scanp = scanp->next)
+ for (scanp = head; scanp; scanp = scanp->next)
{
map->l_searchlist[nlist++] = scanp->map;
diff --git a/elf/dl-fini.c b/elf/dl-fini.c
index 36b4390..9f4233a 100644
--- a/elf/dl-fini.c
+++ b/elf/dl-fini.c
@@ -25,9 +25,11 @@ _dl_fini (void)
struct link_map *l;
for (l = _dl_loaded; l; l = l->l_next)
- if (l->l_init_called && l->l_info[DT_FINI])
+ if (l->l_init_called)
{
- (*(void (*) (void)) (l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr)) ();
+ if (l->l_info[DT_FINI] &&
+ !(l->l_name[0] == '\0' && l->l_type == lt_executable))
+ (*(void (*) (void)) (l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr)) ();
/* Make sure nothing happens if we are called twice. */
l->l_init_called = 0;
}
diff --git a/elf/dl-load.c b/elf/dl-load.c
index ff7f5cf..29ac0bf 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -59,7 +59,14 @@ Cambridge, MA 02139, USA. */
#define STRING(x) #x
+#ifdef MAP_ANON
+/* The fd is not examined when using MAP_ANON. */
+#define ANONFD -1
+#else
int _dl_zerofd = -1;
+#define ANONFD _dl_zerofd
+#endif
+
size_t _dl_pagesize;
@@ -176,6 +183,8 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
if (header->e_phentsize != sizeof (ElfW(Phdr)))
LOSE ("ELF file's phentsize not the expected size");
+#ifndef MAP_ANON
+#define MAP_ANON 0
if (_dl_zerofd == -1)
{
_dl_zerofd = _dl_sysdep_open_zero_fill ();
@@ -185,6 +194,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
_dl_signal_error (errno, NULL, "cannot open zero fill device");
}
}
+#endif
/* Enter the new object in the list of loaded objects. */
l = _dl_new_object (realname, name, l_type);
@@ -329,7 +339,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
caddr_t mapat;
mapat = __mmap ((caddr_t) zeropage, zeroend - zeropage,
c->prot, MAP_ANON|MAP_PRIVATE|MAP_FIXED,
- _dl_zerofd, 0);
+ ANONFD, 0);
if (mapat == (caddr_t) -1)
lose (errno, "cannot map zero-fill pages");
}
diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
index fd7bf05..61615cd 100644
--- a/elf/dl-minimal.c
+++ b/elf/dl-minimal.c
@@ -33,13 +33,18 @@ static void *alloc_ptr, *alloc_end, *alloc_last_block;
void * weak_function
malloc (size_t n)
{
+#ifdef MAP_ANON
+#define _dl_zerofd (-1)
+#else
extern int _dl_zerofd;
- if (_dl_pagesize == 0)
- _dl_pagesize = __getpagesize ();
-
if (_dl_zerofd == -1)
_dl_zerofd = _dl_sysdep_open_zero_fill ();
+#define MAP_ANON 0
+#endif
+
+ if (_dl_pagesize == 0)
+ _dl_pagesize = __getpagesize ();
if (alloc_end == 0)
{
diff --git a/elf/dl-open.c b/elf/dl-open.c
index c24920f..058c3e5 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -39,7 +39,7 @@ _dl_open (const char *file, int mode)
return new;
/* Load that object's dependencies. */
- _dl_map_object_deps (new);
+ _dl_map_object_deps (new, NULL, 0);
/* Relocate the objects loaded. We do this in reverse order so that copy
diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c
index 8ad2c0f..cdacd75 100644
--- a/elf/dl-runtime.c
+++ b/elf/dl-runtime.c
@@ -41,7 +41,7 @@ _dl_object_relocation_scope (struct link_map *l)
if (! l->l_searchlist)
/* We must construct the searchlist for this object. */
- _dl_map_object_deps (l);
+ _dl_map_object_deps (l, NULL, 0);
/* The primary scope is this object itself and its
dependencies. */
diff --git a/elf/link.h b/elf/link.h
index 1e0104a..fa96613 100644
--- a/elf/link.h
+++ b/elf/link.h
@@ -196,9 +196,13 @@ extern int _dlerror_run (void (*operate) (void));
extern struct link_map *_dl_map_object (struct link_map *loader,
const char *name, int type);
-/* Call _dl_map_object on the dependencies of MAP, and
- set up MAP->l_searchlist. */
-extern void _dl_map_object_deps (struct link_map *map);
+/* Call _dl_map_object on the dependencies of MAP, and set up
+ MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously
+ loaded objects that will be inserted into MAP->l_searchlist after MAP
+ but before its dependencies. */
+extern void _dl_map_object_deps (struct link_map *map,
+ struct link_map **preloads,
+ unsigned int npreloads);
/* Cache the locations of MAP's hash table. */
extern void _dl_setup_hash (struct link_map *map);
diff --git a/elf/rtld.c b/elf/rtld.c
index 6baa7a8..2e23d9c 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -21,6 +21,7 @@ Cambridge, MA 02139, USA. */
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
+#include <sys/mman.h> /* Check if MAP_ANON is defined. */
#include "../stdio-common/_itoa.h"
@@ -124,6 +125,8 @@ dl_main (const ElfW(Phdr) *phdr,
struct link_map *l;
int lazy;
int list_only = 0;
+ struct link_map **preloads;
+ unsigned int npreloads;
if (*user_entry == (ElfW(Addr)) &_start)
{
@@ -247,12 +250,52 @@ of this helper program; chances are you did not intend to run this program.\n",
l->l_next = &_dl_rtld_map;
_dl_rtld_map.l_prev = l;
- /* Load all the libraries specified by DT_NEEDED entries. */
- _dl_map_object_deps (l);
+ preloads = NULL;
+ npreloads = 0;
+ if (! _dl_secure)
+ {
+ const char *preloadlist = getenv ("LD_PRELOAD");
+ if (preloadlist)
+ {
+ /* The LD_PRELOAD environment variable gives a colon-separated
+ list of libraries that are loaded before the executable's
+ dependencies and prepended to the global scope list. */
+ char *list = strdupa (preloadlist);
+ char *p;
+ while ((p = strsep (&list, ":")) != NULL)
+ {
+ (void) _dl_map_object (NULL, p, lt_library);
+ ++npreloads;
+ }
+
+ if (npreloads != 0)
+ {
+ /* Set up PRELOADS with a vector of the preloaded libraries. */
+ struct link_map *l;
+ unsigned int i;
+ preloads = __alloca (npreloads * sizeof preloads[0]);
+ l = _dl_rtld_map.l_next; /* End of the chain before preloads. */
+ i = 0;
+ do
+ {
+ preloads[i++] = l;
+ l = l->l_next;
+ } while (l);
+ assert (i == npreloads);
+ }
+ }
+ }
+
+ /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD
+ specified some libraries to load, these are inserted before the actual
+ dependencies in the executable's searchlist for symbol resolution. */
+ _dl_map_object_deps (l, preloads, npreloads);
+#ifndef MAP_ANON
/* We are done mapping things, so close the zero-fill descriptor. */
__close (_dl_zerofd);
_dl_zerofd = -1;
+#endif
/* Remove _dl_rtld_map from the chain. */
_dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next;