* elf/elf.h: Define AT_EXECFN.
* elf/rtld.c [!__ASSUME_AT_EXECFN] (process_envvars): Don't handle LD_ORIGIN_PATH. * elf/dl-sysdep.c (_dl_sysdep_start): Handle AT_EXECFN. * elf/dl-support.c: Define _dl_execfn. Don't define _dl_origin_path if __ASSUME_AT_EXECFN is defined. (_dl_aux_init): Handle AT_EXECFN. * sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_AT_EXECFN for 2.6.27 and up. * sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_execfn. Don't define _dl_origin_path if __ASSUME_AT_EXECFN is defined. * sysdeps/unix/sysv/linux/dl-origin.c (_dl_get_origin): Use _dl_execfn if available and avoid compatibility code if __ASSUME_AT_EXECFN is defined.
This commit is contained in:
Ulrich Drepper
parent
579cdf5a47
commit
0e077a7eea
15
ChangeLog
15
ChangeLog
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@ -1,5 +1,20 @@
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2008-07-24 Ulrich Drepper <drepper@redhat.com>
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* elf/elf.h: Define AT_EXECFN.
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* elf/rtld.c [!__ASSUME_AT_EXECFN] (process_envvars): Don't handle
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LD_ORIGIN_PATH.
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* elf/dl-sysdep.c (_dl_sysdep_start): Handle AT_EXECFN.
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* elf/dl-support.c: Define _dl_execfn. Don't define _dl_origin_path
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if __ASSUME_AT_EXECFN is defined.
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(_dl_aux_init): Handle AT_EXECFN.
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* sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_AT_EXECFN
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for 2.6.27 and up.
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* sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_execfn.
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Don't define _dl_origin_path if __ASSUME_AT_EXECFN is defined.
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* sysdeps/unix/sysv/linux/dl-origin.c (_dl_get_origin): Use
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_dl_execfn if available and avoid compatibility code if
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__ASSUME_AT_EXECFN is defined.
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* sysdeps/unix/sysv/linux/dl-sysdep.h: Don't declare
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_dl_discover_osversion only for older kernels.
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@ -1,5 +1,5 @@
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/* Support for dynamic linking code in static libc.
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Copyright (C) 1996-2005, 2006, 2007 Free Software Foundation, Inc.
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Copyright (C) 1996-2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -62,8 +62,12 @@ struct link_map *_dl_profile_map;
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/* This is the address of the last stack address ever used. */
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void *__libc_stack_end;
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#ifndef __ASSUME_AT_EXECFN
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/* Path where the binary is found. */
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const char *_dl_origin_path;
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#endif
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/* File Name of the executable. */
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const char *_dl_execfn;
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/* Nonzero if runtime lookup should not update the .got/.plt. */
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int _dl_bind_not;
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@ -216,6 +220,9 @@ _dl_aux_init (ElfW(auxv_t) *av)
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__libc_enable_secure = av->a_un.a_val;
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__libc_enable_secure_decided = 1;
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break;
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case AT_EXECFN:
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GLRO(dl_execfn) = (void *) av->a_un.a_val;
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break;
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# ifdef DL_PLATFORM_AUXV
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DL_PLATFORM_AUXV
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# endif
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@ -173,6 +173,9 @@ _dl_sysdep_start (void **start_argptr,
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GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
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break;
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#endif
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case AT_EXECFN:
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GLRO(dl_execfn) = (void *) av->a_un.a_val;
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break;
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#ifdef DL_PLATFORM_AUXV
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DL_PLATFORM_AUXV
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#endif
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@ -970,6 +970,8 @@ typedef struct
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#define AT_SECURE 23 /* Boolean, was exec setuid-like? */
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#define AT_EXECFN 31 /* Filename of executable. */
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/* Pointer to the global system page used for system calls and other
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nice things. */
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#define AT_SYSINFO 32
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@ -2579,10 +2579,12 @@ process_envvars (enum mode *modep)
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break;
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case 11:
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#ifndef __ASSUME_AT_EXECFN
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/* Path where the binary is found. */
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if (!INTUSE(__libc_enable_secure)
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&& memcmp (envline, "ORIGIN_PATH", 11) == 0)
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GLRO(dl_origin_path) = &envline[12];
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#endif
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break;
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case 12:
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@ -38,6 +38,7 @@
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#include <bits/libc-lock.h>
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#include <hp-timing.h>
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#include <tls.h>
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#include <kernel-features.h>
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__BEGIN_DECLS
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@ -592,8 +593,13 @@ struct rtld_global_ro
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/* Names of shared object for which the RPATH should be ignored. */
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EXTERN const char *_dl_inhibit_rpath;
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#ifndef __ASSUME_AT_EXECFN
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/* Location of the binary. */
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EXTERN const char *_dl_origin_path;
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#endif
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/* If set, points to the file name of the executable. */
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EXTERN const char *_dl_execfn;
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/* -1 if the dynamic linker should honor library load bias,
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0 if not, -2 use the default (honor biases for normal
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@ -1,5 +1,5 @@
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/* Find path of executable.
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Copyright (C) 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
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Copyright (C) 1998-2000, 2002, 2004, 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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@ -35,30 +35,32 @@
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const char *
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_dl_get_origin (void)
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{
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#ifndef __ASSUME_AT_EXECFN
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char linkval[PATH_MAX];
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char *result;
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#endif
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char *str;
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char *result = (char *) -1l;
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int len;
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INTERNAL_SYSCALL_DECL (err);
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len = INTERNAL_SYSCALL (readlink, err, 3, "/proc/self/exe", linkval,
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sizeof (linkval));
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if (! INTERNAL_SYSCALL_ERROR_P (len, err) && len > 0 && linkval[0] != '[')
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str = GLRO(dl_execfn);
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#ifndef __ASSUME_AT_EXECFN
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if (str == NULL)
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{
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/* We can use this value. */
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assert (linkval[0] == '/');
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while (len > 1 && linkval[len - 1] != '/')
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--len;
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result = (char *) malloc (len + 1);
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if (result == NULL)
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result = (char *) -1;
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else if (len == 1)
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memcpy (result, "/", 2);
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else
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*((char *) __mempcpy (result, linkval, len - 1)) = '\0';
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INTERNAL_SYSCALL_DECL (err);
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len = INTERNAL_SYSCALL (readlink, err, 3, "/proc/self/exe", linkval,
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sizeof (linkval));
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if (! INTERNAL_SYSCALL_ERROR_P (len, err)
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&& len > 0 && linkval[0] != '[')
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str = linkval;
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}
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else
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#endif
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len = strlen (str);
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#ifndef __ASSUME_AT_EXECFN
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if (str == NULL)
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{
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result = (char *) -1;
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/* We use the environment variable LD_ORIGIN_PATH. If it is set make
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a copy and strip out trailing slashes. */
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if (GLRO(dl_origin_path) != NULL)
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@ -76,6 +78,21 @@ _dl_get_origin (void)
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}
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}
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}
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else
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#endif
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{
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/* We can use this value. */
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assert (str[0] == '/');
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while (len > 1 && str[len - 1] != '/')
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--len;
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result = (char *) malloc (len + 1);
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if (result == NULL)
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result = (char *) -1;
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else if (len == 1)
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memcpy (result, "/", 2);
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else
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*((char *) __mempcpy (result, str, len - 1)) = '\0';
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}
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return result;
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}
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@ -1,6 +1,6 @@
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/* Set flags signalling availability of kernel features based on given
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kernel version number.
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Copyright (C) 1999-2006, 2007 Free Software Foundation, Inc.
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Copyright (C) 1999-2006, 2007, 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -492,3 +492,8 @@
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#if __LINUX_KERNEL_VERSION >= 0x020618
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# define __ASSUME_ADJ_OFFSET_SS_READ 1
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#endif
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/* Support for AT_EXECFN was added in 2.6.27. */
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#if __LINUX_KERNEL_VERSION >= 0x02061b
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# define __ASSUME_AT_EXECFN 1
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#endif
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