Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack
From: Borislav Petkov <bp@alien8.de>
Date: 2021-08-26 16:50:04
Also in:
linux-api, linux-arch, linux-mm, lkml
On Fri, Aug 20, 2021 at 11:11:54AM -0700, Yu-cheng Yu wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c index 5993aa8db338..7c1ca2476a5e 100644 --- a/arch/x86/kernel/shstk.c +++ b/arch/x86/kernel/shstk.c@@ -75,6 +75,61 @@ int shstk_setup(void) return err; } +int shstk_alloc_thread_stack(struct task_struct *tsk, unsigned long clone_flags, + unsigned long stack_size) +{ + struct thread_shstk *shstk = &tsk->thread.shstk; + struct cet_user_state *state; + unsigned long addr; + + if (!shstk->size) + return 0; + + /* + * Earlier clone() does not pass stack_size. Use RLIMIT_STACK and
What is "earlier clone()"?
+ * cap to 4 GB. + */
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette