From: Doug Berger <open...@gmail.com>
[ Upstream commit c51bc12d06b3a5494fbfcbd788a8e307932a06e9 ]
A timing hazard exists when an early fork/exec thread begins
exiting and sets its mm pointer to NULL while a separate core
tries to update the section information.
This commit ensures that the mm pointer is not NULL before
setting its section parameters. The arguments provided by
commit 11ce4b33aedc ("ARM: 8672/1: mm: remove tasklist locking
from update_sections_early()") are equally valid for not
requiring grabbing the task_lock around this check.
Fixes: 08925c2f124f ("ARM: 8464/1: Update all mm structures with section
adjustments")
Signed-off-by: Doug Berger <open...@gmail.com>
Acked-by: Laura Abbott <labb...@redhat.com>
Cc: Mike Rapoport <r...@linux.ibm.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Florian Fainelli <f.faine...@gmail.com>
Cc: Rob Herring <r...@kernel.org>
Cc: "Steven Rostedt (VMware)" <rost...@goodmis.org>
Cc: Peng Fan <peng....@nxp.com>
Cc: Geert Uytterhoeven <ge...@linux-m68k.org>
Signed-off-by: Russell King <rmk+ker...@armlinux.org.uk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
arch/arm/mm/init.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 749a5a6f61433..8e793cddac661 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -613,7 +613,8 @@ static void update_sections_early(struct section_perm
perms[], int n)
if (t->flags & PF_KTHREAD)
continue;
for_each_thread(t, s)
- set_section_perms(perms, n, true, s->mm);
+ if (s->mm)
+ set_section_perms(perms, n, true, s->mm);
}
set_section_perms(perms, n, true, current->active_mm);
set_section_perms(perms, n, true, &init_mm);
--
2.20.1
