+ mm-respect-arch_dup_mmap-return-value.patch added to -mm tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The patch titled
     Subject: mm: respect arch_dup_mmap() return value
has been added to the -mm tree.  Its filename is
     mm-respect-arch_dup_mmap-return-value.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-respect-arch_dup_mmap-return-value.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-respect-arch_dup_mmap-return-value.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Nadav Amit <namit@xxxxxxxxxx>
Subject: mm: respect arch_dup_mmap() return value

d70f2a14b72a4 ("include/linux/sched/mm.h: uninline mmdrop_async(), etc")
ignored the return value of arch_dup_mmap().  As a result, on x86, a
failure to duplicate the LDT (e.g., due to memory allocation error), would
leave the duplicated memory mapping in an inconsistent state.

Fix by regarding the return value, as it was before the change.

Link: http://lkml.kernel.org/r/20180823051229.211856-1-namit@xxxxxxxxxx
Fixes: d70f2a14b72a4 ("include/linux/sched/mm.h: uninline mmdrop_async(), etc")
Signed-off-by: Nadav Amit <namit@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>

Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 kernel/fork.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/fork.c~mm-respect-arch_dup_mmap-return-value
+++ a/kernel/fork.c
@@ -550,8 +550,7 @@ static __latent_entropy int dup_mmap(str
 			goto out;
 	}
 	/* a new mm has just been created */
-	arch_dup_mmap(oldmm, mm);
-	retval = 0;
+	retval = arch_dup_mmap(oldmm, mm);
 out:
 	up_write(&mm->mmap_sem);
 	flush_tlb_mm(oldmm);
_

Patches currently in -mm which might be from namit@xxxxxxxxxx are

mm-respect-arch_dup_mmap-return-value.patch




[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux