This is a note to let you know that I've just added the patch titled
infiniband: fix race condition between infiniband mlx4, mlx5 driver and core dumping
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
infiniband-fix-race-condition-between-infiniband-mlx4-mlx5-driver-and-core-dumping.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From akaher@xxxxxxxxxx Mon Aug 5 08:01:12 2019
From: Ajay Kaher <akaher@xxxxxxxxxx>
Date: Sun, 4 Aug 2019 09:29:26 +0530
Subject: infiniband: fix race condition between infiniband mlx4, mlx5 driver and core dumping
To: <aarcange@xxxxxxxxxx>, <jannh@xxxxxxxxxx>, <oleg@xxxxxxxxxx>, <peterx@xxxxxxxxxx>, <rppt@xxxxxxxxxxxxx>, <jgg@xxxxxxxxxxxx>, <mhocko@xxxxxxxx>
Cc: srinidhir@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, amakhalov@xxxxxxxxxx, sean.hefty@xxxxxxxxx, srivatsa@xxxxxxxxxxxxx, srivatsab@xxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, bvikas@xxxxxxxxxx, dledford@xxxxxxxxxx, akaher@xxxxxxxxxx, riandrews@xxxxxxxxxxx, hal.rosenstock@xxxxxxxxx, vsirnapalli@xxxxxxxxxx, leonro@xxxxxxxxxxxx, jglisse@xxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, yishaih@xxxxxxxxxxxx, matanb@xxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx, arve@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, mike.kravetz@xxxxxxxxxx
Message-ID: <1564891168-30016-2-git-send-email-akaher@xxxxxxxxxx>
From: Ajay Kaher <akaher@xxxxxxxxxx>
This patch is the extension of following upstream commit to fix
the race condition between get_task_mm() and core dumping
for IB->mlx4 and IB->mlx5 drivers:
commit 04f5866e41fb ("coredump: fix race condition between
mmget_not_zero()/get_task_mm() and core dumping")'
Thanks to Jason for pointing this.
Signed-off-by: Ajay Kaher <akaher@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx4/main.c | 4 +++-
drivers/infiniband/hw/mlx5/main.c | 3 +++
2 files changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -1172,6 +1172,8 @@ static void mlx4_ib_disassociate_ucontex
* mlx4_ib_vma_close().
*/
down_write(&owning_mm->mmap_sem);
+ if (!mmget_still_valid(owning_mm))
+ goto skip_mm;
for (i = 0; i < HW_BAR_COUNT; i++) {
vma = context->hw_bar_info[i].vma;
if (!vma)
@@ -1190,7 +1192,7 @@ static void mlx4_ib_disassociate_ucontex
/* context going to be destroyed, should not access ops any more */
context->hw_bar_info[i].vma->vm_ops = NULL;
}
-
+skip_mm:
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1307,6 +1307,8 @@ static void mlx5_ib_disassociate_ucontex
* mlx5_ib_vma_close.
*/
down_write(&owning_mm->mmap_sem);
+ if (!mmget_still_valid(owning_mm))
+ goto skip_mm;
list_for_each_entry_safe(vma_private, n, &context->vma_private_list,
list) {
vma = vma_private->vma;
@@ -1321,6 +1323,7 @@ static void mlx5_ib_disassociate_ucontex
list_del(&vma_private->list);
kfree(vma_private);
}
+skip_mm:
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);
Patches currently in stable-queue which might be from akaher@xxxxxxxxxx are
queue-4.9/infiniband-fix-race-condition-between-infiniband-mlx4-mlx5-driver-and-core-dumping.patch
queue-4.9/coredump-fix-race-condition-between-collapse_huge_page-and-core-dumping.patch
queue-4.9/coredump-fix-race-condition-between-mmget_not_zero-get_task_mm-and-core-dumping.patch
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