Thanks Eric. I had just started to do this based on Andrew's request.
-Janak
Eric W. Biederman wrote:
This patch does a bare bones trivial patch to ensure we always
get -EINVAL on the unsupported cases for sys_unshare. If this
goes in before 2.6.16 it allows us to forward compatible with
future applications using sys_unshare.
Signed-off-by: Eric W. Biederman <[email protected]>
---
kernel/fork.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
46868b4b6ebeb9042dded68a6f6301ffe06820c9
diff --git a/kernel/fork.c b/kernel/fork.c
index 46060cb..411b10d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1535,6 +1535,12 @@ asmlinkage long sys_unshare(unsigned lon
struct sem_undo_list *new_ulist = NULL;
check_unshare_flags(&unshare_flags);
+
+ /* Return -EINVAL for all unsupported flags */
+ err = -EINVAL;
+ if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
+ CLONE_VM|CLONE_FILES|CLONE_SYSVSEM))
+ goto bad_unshare_out;
if ((err = unshare_thread(unshare_flags)))
goto bad_unshare_out;
-
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