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[PATCH] sys_get_thread_area does not clear the returned argument 

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.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Blaisorblade 2005-07-27 11:45:18 -07:00 committed by Linus Torvalds
parent 44456d37b5
commit 71ae18ec69
1 changed files with 2 additions and 0 deletions
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2
arch/i386/kernel/process.c
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@ -917,6 +917,8 @@ 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;