mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
parisc: disable UP-optimized flush_tlb_mm
flush_tlb_mm's "optimized" uniprocessor case of allocating a new context for userspace is exposing a race where we can suddely return to a syscall with the protection id and space id out of sync, trapping on the next userspace access. Debugged-by: James Bottomley <James.Bottomley@HansenPartnership.com> Tested-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
8960223d59
commit
5289f46b9d
1 changed files with 4 additions and 1 deletions
|
@ -44,9 +44,12 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
|
|||
{
|
||||
BUG_ON(mm == &init_mm); /* Should never happen */
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
#if 1 || defined(CONFIG_SMP)
|
||||
flush_tlb_all();
|
||||
#else
|
||||
/* FIXME: currently broken, causing space id and protection ids
|
||||
* to go out of sync, resulting in faults on userspace accesses.
|
||||
*/
|
||||
if (mm) {
|
||||
if (mm->context != 0)
|
||||
free_sid(mm->context);
|
||||
|
|
Loading…
Reference in a new issue