diff options
| author | Blaisorblade <blaisorblade@yahoo.it> | 2005-07-30 21:07:02 +0200 |
|---|---|---|
| committer | Chris Wright <chrisw@osdl.org> | 2005-08-05 00:04:23 -0700 |
| commit | 685dd5ff54ea9b3333df75427bd91d9601813c23 (patch) | |
| tree | 25c4613aece4f422a707e005d0f565286d85b5c8 | |
| parent | 60372783e59079bdfd3ba0477e1907669249a489 (diff) | |
[PATCH] sys_get_thread_area does not clear the returned argument
CC: <stable@kernel.org>
sys_get_thread_area does not memset to 0 its struct user_desc info before
copying it to user space... since sizeof(struct user_desc) is 16 while the
actual datas which are filled are only 12 bytes + 9 bits (across the
bitfields), there is a (small) information leak.
This was already committed to Linus' repository.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Chris Wright <chrisw@osdl.org>
| -rw-r--r-- | arch/i386/kernel/process.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c index 96e3ea6b17c..173799685df 100644 --- a/arch/i386/kernel/process.c +++ b/arch/i386/kernel/process.c @@ -827,6 +827,8 @@ asmlinkage int sys_get_thread_area(struct user_desc __user *u_info) if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) return -EINVAL; + memset(&info, 0, sizeof(info)); + desc = current->thread.tls_array + idx - GDT_ENTRY_TLS_MIN; info.entry_number = idx; |