fork: Add task stack refcounting sanity check and prevent premature task stack freeing
authorAndy Lutomirski <luto@kernel.org>
Mon, 31 Oct 2016 15:11:43 +0000 (08:11 -0700)
committerIngo Molnar <mingo@kernel.org>
Tue, 1 Nov 2016 06:39:17 +0000 (07:39 +0100)
commit405c0759712f57b680f66aee9c55cd06ad1cbdef
tree3a93cb428043131fd231b348dbe469be9dfadc30
parent0c183d92b20b5c84ca655b45ef57b3318b83eb9e
fork: Add task stack refcounting sanity check and prevent premature task stack freeing

If something goes wrong with task stack refcounting and a stack
refcount hits zero too early, warn and leak it rather than
potentially freeing it early (and silently).

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/f29119c783a9680a4b4656e751b6123917ace94b.1477926663.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/fork.c