On 7/2/23 16:30, Linus Torvalds wrote:
On Sun, 2 Jul 2023 at 15:45, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
Would you mind just verifying that yes, that commit on mainline is
broken for you, and the previous one works?
Also, while I looked at it again, and still didn't understand why
parisc would be different here, I *did* realize that because parisc
has a stack that grows up, the debug warning I added for GUP won't
trigger.
So if I got that execve() logic wrong for STACK_GROWSUP (which I
clearly must have), then exactly because it's grows-up, a GUP failure
wouldn't warn about not expanding the stack.
IOW, would you mind applying something like this on top of the current
kernel, and let me know if it warns?
I can reproduce the problem in qemu. However, I do not see a warning
after applying your patch.
Guenter
