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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=vjQNCPEVpfjC6StvhboA:9 cc=ntf awl=host:13600 X-Proofpoint-ORIG-GUID: 6JeQyfXQMwPsNVG7jbTqPWWuPdRJzbaA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzE3MDE1MCBTYWx0ZWRfX6fdzb8nPdoLM L/UtumJcJahBbguVsQCVahsz4AfmiKwmh73ndHYMux/9CXEMQGmkEmkVdyCPtplfoU6w+RlYRIP YhYbu+oxXdoj46dFOFXSpuHidwuhvtCW6JJH7Rx0LNW+6Ti3jlUFbhrTvYfnjjM6kFE04rTlb8P WON0Ky+0C6XyuDWiAtvUVwzujvoP0JGsZOJ5Bg1bJo+6YvRq6pbxbamG1gj03tHF0WrC0AQdg9b yLO42Q8/0faLJ2HJov3K/gaH9Z2ROxg9zKAsZhXcrb5xbqPSb4ef9RNLCJNauwzfwc1f9sADbRB FwGuOm4n7re4DlnTxba83+L7eAawoubGISbgegf+REV0uKi0isFZCi8d4MM4Owb1EnvlbAMwhaX XUOEPf+w4ve6LaLwbrpY2wb9aHRc/R8hsSM2cShNxD5mxalYq7r4EZFAElTSJceNnbJOF0kx Content-Type: text/plain; charset="utf-8" When an mlock()'d VMA is expanded, we need to populate the expanded region to maintain the contract that all mlock()'d memory is present (albeit - with some period after mmap unlock where the expanded part of the mapping remains unfaulted). The current implementation is very unclear, so make it absolutely explicit under what circumstances we do this. Signed-off-by: Lorenzo Stoakes Reviewed-by: Vlastimil Babka --- mm/mremap.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 3678f21c2c36..28e776cddc08 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -65,7 +65,7 @@ struct vma_remap_struct { =20 /* Internal state, determined in do_mremap(). */ unsigned long delta; /* Absolute delta of old_len,new_len. */ - bool mlocked; /* Was the VMA mlock()'d? */ + bool populate_expand; /* mlock()'d expanded, must populate. */ enum mremap_type remap_type; /* expand, shrink, etc. */ bool mmap_locked; /* Is mm currently write-locked? */ unsigned long charged; /* If VM_ACCOUNT, # pages to account. */ @@ -1010,10 +1010,8 @@ static void vrm_stat_account(struct vma_remap_struct= *vrm, struct vm_area_struct *vma =3D vrm->vma; =20 vm_stat_account(mm, vma->vm_flags, pages); - if (vma->vm_flags & VM_LOCKED) { + if (vma->vm_flags & VM_LOCKED) mm->locked_vm +=3D pages; - vrm->mlocked =3D true; - } } =20 /* @@ -1653,6 +1651,10 @@ static int check_prep_vma(struct vma_remap_struct *v= rm) if (new_len <=3D old_len) return 0; =20 + /* We are expanding and the VMA is mlock()'d so we need to populate. */ + if (vma->vm_flags & VM_LOCKED) + vrm->populate_expand =3D true; + /* Need to be careful about a growing mapping */ pgoff =3D (addr - vma->vm_start) >> PAGE_SHIFT; pgoff +=3D vma->vm_pgoff; @@ -1773,7 +1775,8 @@ static unsigned long do_mremap(struct vma_remap_struc= t *vrm) if (vrm->mmap_locked) mmap_write_unlock(mm); =20 - if (!failed && vrm->mlocked && vrm->new_len > vrm->old_len) + /* VMA mlock'd + was expanded, so populated expanded region. */ + if (!failed && vrm->populate_expand) mm_populate(vrm->new_addr + vrm->old_len, vrm->delta); =20 notify_uffd(vrm, failed); --=20 2.50.1