Johannes Berg 833f5208b1 um: defer killing userspace on page table update failures ... commit a7d48886cacf8b426e0079bca9639d2657cf2d38 upstream. In some cases we can get to fix_range_common() with mmap_sem held, and in others we get there without it being held. For example, we get there with it held from sys_mprotect(), and without it held from fork_handler(). Avoid any issues in this and simply defer killing the task until it runs the next time. Do it on the mm so that another task that shares the same mm can't continue running afterwards. Cc: stable@vger.kernel.org Fixes: 468f65976a ("um: Fix hung task in fix_range_common()") Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-03-04 11:38:42 +01:00
..
asm	um: Call pgtable_pmd_page_dtor() in __pmd_free_tlb()	2020-11-10 21:49:32 +01:00
linux	um: Implement ndelay/udelay in time-travel mode	2020-03-29 23:29:52 +02:00
shared	um: defer killing userspace on page table update failures	2021-03-04 11:38:42 +01:00