This is a note to let you know that I've just added the patch titled staging/lustre/lov: remove set_fs() call from lov_getstripe() to the 4.11-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: staging-lustre-lov-remove-set_fs-call-from-lov_getstripe.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 0a33252e060e97ed3fbdcec9517672f1e91aaef3 Mon Sep 17 00:00:00 2001 From: Oleg Drokin <green@xxxxxxxxxxxxxx> Date: Fri, 26 May 2017 23:40:33 -0400 Subject: staging/lustre/lov: remove set_fs() call from lov_getstripe() From: Oleg Drokin <green@xxxxxxxxxxxxxx> commit 0a33252e060e97ed3fbdcec9517672f1e91aaef3 upstream. lov_getstripe() calls set_fs(KERNEL_DS) so that it can handle a struct lov_user_md pointer from user- or kernel-space. This changes the behavior of copy_from_user() on SPARC and may result in a misaligned access exception which in turn oopses the kernel. In fact the relevant argument to lov_getstripe() is never called with a kernel-space pointer and so changing the address limits is unnecessary and so we remove the calls to save, set, and restore the address limits. Signed-off-by: John L. Hammond <john.hammond@xxxxxxxxx> Reviewed-on: http://review.whamcloud.com/6150 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3221 Reviewed-by: Andreas Dilger <andreas.dilger@xxxxxxxxx> Reviewed-by: Li Wei <wei.g.li@xxxxxxxxx> Signed-off-by: Oleg Drokin <green@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/lustre/lustre/lov/lov_pack.c | 9 --------- 1 file changed, 9 deletions(-) --- a/drivers/staging/lustre/lustre/lov/lov_pack.c +++ b/drivers/staging/lustre/lustre/lov/lov_pack.c @@ -293,18 +293,10 @@ int lov_getstripe(struct lov_object *obj size_t lmmk_size; size_t lum_size; int rc; - mm_segment_t seg; if (!lsm) return -ENODATA; - /* - * "Switch to kernel segment" to allow copying from kernel space by - * copy_{to,from}_user(). - */ - seg = get_fs(); - set_fs(KERNEL_DS); - if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) { CERROR("bad LSM MAGIC: 0x%08X != 0x%08X nor 0x%08X\n", lsm->lsm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3); @@ -406,6 +398,5 @@ int lov_getstripe(struct lov_object *obj out_free: kvfree(lmmk); out: - set_fs(seg); return rc; } Patches currently in stable-queue which might be from green@xxxxxxxxxxxxxx are queue-4.11/staging-lustre-lov-remove-set_fs-call-from-lov_getstripe.patch