Usermode exec-stack fix

When loading a shared library that requires an executable stack,
glibc uses the mprotext PROT_GROWSDOWN flag to achieve this.
We don't support PROT_GROWSDOWN.
Add a special case to handle changing the stack permissions in this way.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 2d920f2017..accb44d9de 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1018,6 +1018,7 @@ static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
     /* we reserve one extra page at the top of the stack as guard */
     target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
 
+    info->stack_limit = error;
     stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
     p += stack_base;