diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 2022-10-21 18:14:10 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 2022-10-21 18:14:10 +0000 |
| commit | 217bdbf58108a84f01043bc1d07ac6b6a0d37960 (patch) | |
| tree | 95e5a49e5325c35d0de1dc3dba9d02cc7f8ecbdd /lib | |
| parent | 4a8dc2aa23e061b898f8f1cf016bb0bb7b911f4f (diff) | |
static binaries self-mprotect their relro in crt0. mimmutable() also works
here.
ok kettenis
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/csu/boot.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/csu/boot.h b/lib/csu/boot.h index f9b6a641a1f..72cbfee007b 100644 --- a/lib/csu/boot.h +++ b/lib/csu/boot.h @@ -1,4 +1,4 @@ -/* $OpenBSD: boot.h,v 1.33 2022/01/12 21:41:06 guenther Exp $ */ +/* $OpenBSD: boot.h,v 1.34 2022/10/21 18:14:09 deraadt Exp $ */ /* * Copyright (c) 1998 Per Fogelstrom, Opsycon AB @@ -50,6 +50,7 @@ void _dl_exit(int); */ #define REDIRECT_SYSCALL(x) typeof(x) x asm("_libc_"#x) __dso_hidden REDIRECT_SYSCALL(mprotect); +REDIRECT_SYSCALL(mimmutable); #if RELOC_TAG == DT_RELA typedef Elf_RelA RELOC_TYPE; @@ -63,8 +64,10 @@ static void *relro_addr; static size_t relro_size; #define RCRT0_RELRO() \ do { \ - if (relro_addr != NULL && relro_size != 0) \ + if (relro_addr != NULL && relro_size != 0) { \ mprotect(relro_addr, relro_size, PROT_READ); \ + mimmutable(relro_addr, relro_size); \ + } \ } while (0) /* |