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authorRoland McGrath <roland@gnu.org>1996-04-21 00:27:19 +0000
committerRoland McGrath <roland@gnu.org>1996-04-21 00:27:19 +0000
commitb0d20a87b5f0ba27496abcb6a4f9ad99fd412303 (patch)
tree9a6f89f0486f5cc4d4d8b4d25b1d9c9a745a2dc9 /sysdeps/generic/dl-sysdep.c
parenta641835acd28fabf507c5a99d7805c694c2ec7e3 (diff)
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Sat Apr 20 18:13:00 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>cvs/libc-960423cvs/libc-960422cvs/libc-960421
* Makerules (no-whole-archive): Test $(have-no-whole-archive), not $(libc_cv_ld_no_whole_archive). Sat Apr 20 17:07:17 1996 Ulrich Drepper <drepper@cygnus.com> * assert/assert.h, ctype/ctype.h, dirent/dirent.h, errno.h, grp/grp.h, io/fcntl.h, io/sys/stat.h, io/utime.h, locale/locale.h, math/math.h, misc/nlist.h, misc/sgtty.h, misc/sys/file.h, misc/sys/ioctl.h, misc/sys/uio.h, posix/sys/times.h, posix/sys/types.h, posix/sys/utsname.h, posix/sys/wait.h, posix/tar.h, posix/wordexp.h, pwd/pwd.h, resource/sys/vlimit.h, resource/sys/vtimes.h, setjmp/setjmp.h, signal/signal.h, stdio-common/printf.h, stdlib/alloca.h, stdlib/stdlib.h, string/string.h, sysdeps/generic/sigaction.h, sysdeps/generic/sigset.h, sysdeps/generic/sys/ptrace.h, sysdeps/generic/sys/ptrace.h, sysdeps/unix/bsd/osf/sigaction.h, sysdeps/unix/sysv/linux/sys/ptrace.h, sysdeps/unix/sysv/minix/sigaction.h, sysdeps/unix/sysv/sco3.2.4/sigaction.h, sysdeps/unix/sysv/sysv4/sigaction.h, sysdeps/unix/sysv/sysv4/sigset.h, termios/termios.h, time/sys/time.h, time/time.h: Fix copyright comment. * sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): If uids and gids are not given in stack aux vector, fetch them with syscalls.
Diffstat (limited to 'sysdeps/generic/dl-sysdep.c')
-rw-r--r--sysdeps/generic/dl-sysdep.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c
index 546993dbd1..4d5faad69f 100644
--- a/sysdeps/generic/dl-sysdep.c
+++ b/sysdeps/generic/dl-sysdep.c
@@ -40,6 +40,7 @@ _dl_sysdep_start (void **start_argptr,
Elf32_auxv_t *av;
uid_t uid, euid;
gid_t gid, egid;
+ unsigned int seen;
user_entry = (Elf32_Addr) &_start;
_dl_argc = *(int *) start_argptr;
@@ -49,7 +50,12 @@ _dl_sysdep_start (void **start_argptr,
while (*start_argptr)
++start_argptr;
- for (av = (void *) ++start_argptr; av->a_type != AT_NULL; ++av)
+ seen = 0;
+#define M(type) (1 << (type))
+
+ for (av = (void *) ++start_argptr;
+ av->a_type != AT_NULL;
+ seen |= M ((++av)->a_type))
switch (av->a_type)
{
case AT_PHDR:
@@ -75,6 +81,16 @@ _dl_sysdep_start (void **start_argptr,
break;
}
+ /* Linux doesn't provide us with any of these values on the stack
+ when the dynamic linker is run directly as a program. */
+
+#define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid ()
+ SEE (UID, uid);
+ SEE (GID, gid);
+ SEE (EUID, euid);
+ SEE (EGID, egid);
+
+
_dl_secure = uid != euid || gid != egid;
#ifdef DL_SYSDEP_INIT