diff options
| author | Dale Rahn <drahn@cvs.openbsd.org> | 2003-02-15 22:43:07 +0000 |
|---|---|---|
| committer | Dale Rahn <drahn@cvs.openbsd.org> | 2003-02-15 22:43:07 +0000 |
| commit | 4a0dddfd01348e3c2a7f9b347673233797e055d7 (patch) | |
| tree | 048606d86c48e9f44cc3f7e00a71e609ae221b49 /libexec/ld.so/loader.c | |
| parent | 6c34c2c4c127669edb0ec50693e3493ce3c5f154 (diff) | |
After relocation is completed, remove write protection from GOT/PLT in ld.so.
Diffstat (limited to 'libexec/ld.so/loader.c')
| -rw-r--r-- | libexec/ld.so/loader.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/libexec/ld.so/loader.c b/libexec/ld.so/loader.c index 7be6c73e70d..04587cb007f 100644 --- a/libexec/ld.so/loader.c +++ b/libexec/ld.so/loader.c @@ -1,4 +1,4 @@ -/* $OpenBSD: loader.c,v 1.54 2003/02/02 16:57:58 deraadt Exp $ */ +/* $OpenBSD: loader.c,v 1.55 2003/02/15 22:43:06 drahn Exp $ */ /* * Copyright (c) 1998 Per Fogelstrom, Opsycon AB @@ -173,6 +173,33 @@ _dl_boot(const char **argv, char **envp, const long loff, long *dl_data) else _dl_pagesz = 4096; + /* + * now that GOT and PLT has been relocated, and we know page size + * protect it from modification + */ + { + extern char *__got_start; + extern char *__got_end; +#ifndef __i386__ + extern char *__plt_start; + extern char *__plt_end; +#endif + + _dl_mprotect((void *)ELF_TRUNC((long)&__got_start, _dl_pagesz), + ELF_ROUND((long)&__got_end,_dl_pagesz) - + ELF_TRUNC((long)&__got_start, _dl_pagesz), + GOT_PERMS); + +#ifndef __i386__ + /* only for DATA_PLT or BSS_PLT */ + _dl_mprotect((void *)ELF_TRUNC((long)&__plt_start, _dl_pagesz), + ELF_ROUND((long)&__plt_end,_dl_pagesz) - + ELF_TRUNC((long)&__plt_start, _dl_pagesz), + PROT_READ|PROT_EXEC); +#endif + } + + DL_DEB(("rtld loading: '%s'\n", _dl_progname)); exe_obj = NULL; |