2003-06-26 Roland McGrath <roland@redhat.com>
* elf/elf.h (AT_SECURE): New macro. * sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): Grok it, set __libc_enable_secure. (_dl_show_auxv): Add AT_SECURE to name table. * elf/dl-support.c (_dl_aux_init): Grok AT_SECURE, set __libc_enable_secure and __libc_enable_secure_decided. * sysdeps/unix/sysv/linux/ldsodefs.h [__ASSUME_AT_SECURE] (HAVE_AUX_SECURE): Define it. * sysdeps/unix/sysv/linux/kernel-features.h [__LINUX_KERNEL_VERSION >= 132425] (__ASSUME_AT_SECURE): Define it.
This commit is contained in:
Roland McGrath
parent
95a305bec3
commit
c801e76565
|
|
@ -188,6 +188,11 @@ _dl_aux_init (ElfW(auxv_t) *av)
|
|||
gid ^= av->a_un.a_val;
|
||||
seen |= 8;
|
||||
break;
|
||||
case AT_SECURE:
|
||||
seen = -1;
|
||||
__libc_enable_secure = av->a_un.a_val;
|
||||
__libc_enable_secure_decided = 1;
|
||||
break;
|
||||
}
|
||||
if (seen == 0xf)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -945,7 +945,9 @@ typedef struct
|
|||
|
||||
/* A special ignored value for PPC, used by the kernel to control the
|
||||
interpretation of the AUXV. Must be > 16. */
|
||||
#define AT_IGNOREPPC 22 /* Entry should be ignored */
|
||||
#define AT_IGNOREPPC 22 /* Entry should be ignored. */
|
||||
|
||||
#define AT_SECURE 23 /* Boolean, was exec setuid-like? */
|
||||
|
||||
/* Pointer to the global system page used for system calls and other
|
||||
nice things. */
|
||||
|
|
|
|||
|
|
@ -79,14 +79,19 @@ _dl_sysdep_start (void **start_argptr,
|
|||
ElfW(Word) phnum = 0;
|
||||
ElfW(Addr) user_entry;
|
||||
ElfW(auxv_t) *av;
|
||||
#ifdef HAVE_AUX_SECURE
|
||||
# define set_seen_secure() ((void) 0)
|
||||
#else
|
||||
uid_t uid = 0;
|
||||
gid_t gid = 0;
|
||||
#ifdef HAVE_AUX_XID
|
||||
# define set_seen(tag) (tag) /* Evaluate for the side effects. */
|
||||
#else
|
||||
unsigned int seen = 0;
|
||||
# define M(type) (1 << (type))
|
||||
# define set_seen(tag) seen |= M ((tag)->a_type)
|
||||
# define set_seen_secure() (seen = -1)
|
||||
# ifdef HAVE_AUX_XID
|
||||
# define set_seen(tag) (tag) /* Evaluate for the side effects. */
|
||||
# else
|
||||
# define M(type) (1 << (type))
|
||||
# define set_seen(tag) seen |= M ((tag)->a_type)
|
||||
# endif
|
||||
#endif
|
||||
|
||||
DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, INTUSE(_dl_argv), _environ,
|
||||
|
|
@ -123,6 +128,10 @@ _dl_sysdep_start (void **start_argptr,
|
|||
case AT_EGID:
|
||||
gid ^= av->a_un.a_val;
|
||||
break;
|
||||
case AT_SECURE:
|
||||
seen = -1;
|
||||
INTUSE(__libc_enable_secure) = av->a_un.a_val;
|
||||
break;
|
||||
case AT_PLATFORM:
|
||||
GL(dl_platform) = av->a_un.a_ptr;
|
||||
break;
|
||||
|
|
@ -152,20 +161,25 @@ _dl_sysdep_start (void **start_argptr,
|
|||
DL_SYSDEP_OSCHECK (dl_fatal);
|
||||
#endif
|
||||
|
||||
/* Fill in the values we have not gotten from the kernel through the
|
||||
auxiliary vector. */
|
||||
#ifndef HAVE_AUX_XID
|
||||
#ifndef HAVE_AUX_SECURE
|
||||
if (seen != -1)
|
||||
{
|
||||
/* Fill in the values we have not gotten from the kernel through the
|
||||
auxiliary vector. */
|
||||
# ifndef HAVE_AUX_XID
|
||||
# define SEE(UID, var, uid) \
|
||||
if ((seen & M (AT_##UID)) == 0) var ^= __get##uid ()
|
||||
SEE (UID, uid, uid);
|
||||
SEE (EUID, uid, euid);
|
||||
SEE (GID, gid, gid);
|
||||
SEE (EGID, gid, egid);
|
||||
#endif
|
||||
SEE (UID, uid, uid);
|
||||
SEE (EUID, uid, euid);
|
||||
SEE (GID, gid, gid);
|
||||
SEE (EGID, gid, egid);
|
||||
# endif
|
||||
|
||||
/* If one of the two pairs of IDs does not match this is a setuid
|
||||
or setgid run. */
|
||||
INTUSE(__libc_enable_secure) = uid | gid;
|
||||
/* If one of the two pairs of IDs does not match this is a setuid
|
||||
or setgid run. */
|
||||
INTUSE(__libc_enable_secure) = uid | gid;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef HAVE_AUX_PAGESIZE
|
||||
if (GL(dl_pagesize) == 0)
|
||||
|
|
@ -253,8 +267,9 @@ _dl_show_auxv (void)
|
|||
[AT_UCACHEBSIZE - 2] = { "AT_UCACHEBSIZE: 0x", hex },
|
||||
#ifdef NEED_DL_SYSINFO
|
||||
[AT_SYSINFO - 2] = { "AT_SYSINFO: 0x", hex },
|
||||
[AT_SYSINFO_EHDR - 2] = { "AT_SYSINFO_EHDR: 0x", hex }
|
||||
[AT_SYSINFO_EHDR - 2] = { "AT_SYSINFO_EHDR: 0x", hex },
|
||||
#endif
|
||||
[AT_SECURE - 2] = { "AT_SECURE: ", dec },
|
||||
};
|
||||
unsigned int idx = (unsigned int) (av->a_type - 2);
|
||||
|
||||
|
|
|
|||
|
|
@ -321,3 +321,9 @@
|
|||
#if __LINUX_KERNEL_VERSION >= 132426
|
||||
# define __ASSUME_STATFS64 1
|
||||
#endif
|
||||
|
||||
/* Starting with at least 2.5.74 the kernel passes the setuid-like exec
|
||||
flag unconditionally up to the child. */
|
||||
#if __LINUX_KERNEL_VERSION >= 132426
|
||||
# define __ASSUME_AT_SECURE 1
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
/* Run-time dynamic linker data structures for loaded ELF shared objects.
|
||||
Copyright (C) 2001, 2002 Free Software Foundation, Inc.
|
||||
Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
|
|
@ -41,6 +41,12 @@ extern void _dl_non_dynamic_init (void) internal_function;
|
|||
# define HAVE_AUX_XID
|
||||
#endif
|
||||
|
||||
/* We can assume that the kernel always provides the AT_SECURE value
|
||||
in the auxiliary vector from 2.5.74 or so on. */
|
||||
#if __ASSUME_AT_SECURE
|
||||
# define HAVE_AUX_SECURE
|
||||
#endif
|
||||
|
||||
/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
|
||||
up the page size information. */
|
||||
#if __ASSUME_AT_PAGESIZE
|
||||
|
|
|
|||
Loading…
Reference in New Issue