diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/dl-osinfo.h')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/dl-osinfo.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/dl-osinfo.h b/REORG.TODO/sysdeps/unix/sysv/linux/dl-osinfo.h new file mode 100644 index 0000000000..823cd8224d --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/dl-osinfo.h @@ -0,0 +1,79 @@ +/* Operating system specific code for generic dynamic loader functions. Linux. + Copyright (C) 2000-2017 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 + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <dl-sysdep.h> +#include <endian.h> +#include <fcntl.h> +#include <stdint.h> +#include <not-cancel.h> + +#ifndef MIN +# define MIN(a,b) (((a)<(b))?(a):(b)) +#endif + +#define DL_SYSDEP_OSCHECK(FATAL) \ + do { \ + /* Test whether the kernel is new enough. This test is only performed \ + if the library is not compiled to run on all kernels. */ \ + \ + int version = _dl_discover_osversion (); \ + if (__glibc_likely (version >= 0)) \ + { \ + if (__builtin_expect (GLRO(dl_osversion) == 0, 1) \ + || GLRO(dl_osversion) > version) \ + GLRO(dl_osversion) = version; \ + \ + /* Now we can test with the required version. */ \ + if (__LINUX_KERNEL_VERSION > 0 && version < __LINUX_KERNEL_VERSION) \ + /* Not sufficent. */ \ + FATAL ("FATAL: kernel too old\n"); \ + } \ + else if (__LINUX_KERNEL_VERSION > 0) \ + FATAL ("FATAL: cannot determine kernel version\n"); \ + } while (0) + +static inline uintptr_t __attribute__ ((always_inline)) +_dl_setup_stack_chk_guard (void *dl_random) +{ + union + { + uintptr_t num; + unsigned char bytes[sizeof (uintptr_t)]; + } ret; + + /* We need in the moment only 8 bytes on 32-bit platforms and 16 + bytes on 64-bit platforms. Therefore we can use the data + directly and not use the kernel-provided data to seed a PRNG. */ + memcpy (ret.bytes, dl_random, sizeof (ret)); +#if BYTE_ORDER == LITTLE_ENDIAN + ret.num &= ~(uintptr_t) 0xff; +#elif BYTE_ORDER == BIG_ENDIAN + ret.num &= ~((uintptr_t) 0xff << (8 * (sizeof (ret) - 1))); +#else +# error "BYTE_ORDER unknown" +#endif + return ret.num; +} + +static inline uintptr_t __attribute__ ((always_inline)) +_dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard) +{ + uintptr_t ret; + memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret)); + return ret; +} |