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authorRoland McGrath <roland@gnu.org>2004-03-20 20:19:09 +0000
committerRoland McGrath <roland@gnu.org>2004-03-20 20:19:09 +0000
commit316febbc9fdf7f8c654bb6bb68c5506fce517cd7 (patch)
tree89e0db881df42f1c3161ff006a7cb37bb4d47e0a /sysdeps/mach/hurd
parent2fe30ae5daa70cdc6cc49f637efa31b0c379c2e7 (diff)
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2004-03-20 Roland McGrath <roland@frob.com>
* sysdeps/mach/hurd/dl-execstack.c: New file.
Diffstat (limited to 'sysdeps/mach/hurd')
-rw-r--r--sysdeps/mach/hurd/dl-execstack.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/dl-execstack.c b/sysdeps/mach/hurd/dl-execstack.c
new file mode 100644
index 0000000000..d5c07369cf
--- /dev/null
+++ b/sysdeps/mach/hurd/dl-execstack.c
@@ -0,0 +1,47 @@
+/* Stack executability handling for GNU dynamic linker. Hurd version.
+ Copyright (C) 2004 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <ldsodefs.h>
+#include <hurdstartup.h>
+#include <errno.h>
+
+extern struct hurd_startup_data *_dl_hurd_data attribute_hidden;
+
+/* There is no portable way to know the bounds of the initial thread's stack
+ so as to mprotect it. */
+
+int
+internal_function
+_dl_make_stack_executable (void **stack_endp)
+{
+ /* Challenge the caller. */
+ if (__builtin_expect (*stack_endp != __libc_stack_end, 0))
+ return EPERM;
+ *stack_endp = NULL;
+
+ if (__mprotect ((void *)_dl_hurd_data->stack_base, _dl_hurd_data->stack_size,
+ PROT_READ|PROT_WRITE|PROT_EXEC) != 0)
+ return errno;
+
+ /* Remember that we changed the permission. */
+ GL(dl_stack_flags) |= PF_X;
+
+ return 0;
+}
+rtld_hidden_def (_dl_make_stack_executable)