diff options
| author | Dale Rahn <drahn@cvs.openbsd.org> | 2003-05-30 01:13:54 +0000 |
|---|---|---|
| committer | Dale Rahn <drahn@cvs.openbsd.org> | 2003-05-30 01:13:54 +0000 |
| commit | e0412874e2e423e326125c2e936d4d27d7f2e87b (patch) | |
| tree | a812a7dd7f9a4d94243a97d3947e66fe9d372314 /libexec/ld.so/i386 | |
| parent | 441e1efd56d21b17558bc2e2803d3409279c359b (diff) | |
When loading a shared object or libraries dependant object, load them
in random order. This will reduce the possiblity of a buffer overflow
being able to predict the addresss of useful code. Can be disabled
with the LD_NORANDOM environment variable for debugging purposes.
ok deraadt.
Diffstat (limited to 'libexec/ld.so/i386')
| -rw-r--r-- | libexec/ld.so/i386/ldasm.S | 12 | ||||
| -rw-r--r-- | libexec/ld.so/i386/syscall.h | 3 |
2 files changed, 13 insertions, 2 deletions
diff --git a/libexec/ld.so/i386/ldasm.S b/libexec/ld.so/i386/ldasm.S index cf20d25310d..230deaa30a2 100644 --- a/libexec/ld.so/i386/ldasm.S +++ b/libexec/ld.so/i386/ldasm.S @@ -1,4 +1,4 @@ -/* $OpenBSD: ldasm.S,v 1.4 2003/02/02 16:57:58 deraadt Exp $ */ +/* $OpenBSD: ldasm.S,v 1.5 2003/05/30 01:13:53 drahn Exp $ */ /* * Copyright (c) 2002 Dale Rahn @@ -210,6 +210,16 @@ _dl_fcntl: jb 1f /* error: result = -errno */ ret + .section ".text" + .align 4 + .global _dl_sysctl + .type _dl_sysctl,@function +_dl_sysctl: + mov $SYS___sysctl, %eax + int $0x80 + jb 1f /* error: result = -errno */ + ret + .section ".text" .align 4 diff --git a/libexec/ld.so/i386/syscall.h b/libexec/ld.so/i386/syscall.h index f853ad4cb6c..4a7e23c0c6f 100644 --- a/libexec/ld.so/i386/syscall.h +++ b/libexec/ld.so/i386/syscall.h @@ -1,4 +1,4 @@ -/* $OpenBSD: syscall.h,v 1.2 2002/12/18 19:20:02 drahn Exp $ */ +/* $OpenBSD: syscall.h,v 1.3 2003/05/30 01:13:53 drahn Exp $ */ /* * Copyright (c) 2001 Niklas Hallqvist @@ -59,6 +59,7 @@ int _dl_fstat(int, struct stat *); int _dl_fcntl(int, int, ...); int _dl_getdirentries(int, char*, int, long *); int _dl_sigprocmask(int, const sigset_t *, sigset_t *); +int _dl_sysctl(int *, u_int, void *, size_t *, void *, size_t); static inline off_t _dl_lseek(int fildes, off_t offset, int whence) |