From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Sent: 24 February 2022 09:17
On Thu, Feb 24, 2022 at 10:12 AM David Laight <David.Laight@xxxxxxxxxx> wrote:
From: Geert Uytterhoeven
Sent: 24 February 2022 08:59
...
+register unsigned long current_stack_pointer __asm__("sp");
I don't know what HARDENED_USERCOPY does, so I don't know if you need
"usp" (see rdusp()) or "sp"?
HARDENED_USERCOPY significantly slows down some systems calls
(especially things like sendmsg()) by trying to run-time verify
that the kernel buffer doesn't overrun a stack frame or kmalloc()ed
Kernel stack frame of user stack frame?
Kernel, the kernel doesn't care if the user stack gets trashed.
David
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