leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mm: Allow arm64 mmap(PROT_MTE) on RAM-based files

Browse Source 
Since arm64 memory (allocation) tags can only be stored in RAM, mapping
files with PROT_MTE is not allowed by default. RAM-based files like
those in a tmpfs mount or memfd_create() can support memory tagging, so
update the vm_flags accordingly in shmem_mmap().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Catalin Marinas 2019-11-29 12:45:08 +00:00
parent 0042090548
commit 51b0bff2f7
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
mm/shmem.c
View File

@ -2267,6 +2267,9 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
vma->vm_flags &= ~(VM_MAYWRITE);
}
/* arm64 - allow memory tagging on RAM-based files */
vma->vm_flags |= VM_MTE_ALLOWED;
file_accessed(file);
vma->vm_ops = &shmem_vm_ops;
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&