From: Linus Torvalds torvalds@linux-foundation.org
commit fe673d3f5bf1fc50cdc4b754831db91a2ec10126 upstream
Instead of using GUP, make fault_in_safe_writeable() actually force a 'handle_mm_fault()' using the same fixup_user_fault() machinery that futexes already use.
Using the GUP machinery meant that fault_in_safe_writeable() did not do everything that a real fault would do, ranging from not auto-expanding the stack segment, to not updating accessed or dirty flags in the page tables (GUP sets those flags on the pages themselves).
The latter causes problems on architectures (like s390) that do accessed bit handling in software, which meant that fault_in_safe_writeable() didn't actually do all the fault handling it needed to, and trying to access the user address afterwards would still cause faults.
Reported-and-tested-by: Andreas Gruenbacher agruenba@redhat.com Fixes: cdd591fc86e3 ("iov_iter: Introduce fault_in_iov_iter_writeable") Link: https://lore.kernel.org/all/CAHc6FU5nP+nziNGG0JAF1FUx-GV7kKFvM7aZuU_XD2_1v4v... Acked-by: David Hildenbrand david@redhat.com Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Anand Jain anand.jain@oracle.com --- mm/gup.c | 57 +++++++++++++++++++------------------------------------- 1 file changed, 19 insertions(+), 38 deletions(-)
diff --git a/mm/gup.c b/mm/gup.c index a4c6affe6df3..ba2ab7a223f8 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1723,11 +1723,11 @@ EXPORT_SYMBOL(fault_in_writeable); * @uaddr: start of address range * @size: length of address range * - * Faults in an address range using get_user_pages, i.e., without triggering - * hardware page faults. This is primarily useful when we already know that - * some or all of the pages in the address range aren't in memory. + * Faults in an address range for writing. This is primarily useful when we + * already know that some or all of the pages in the address range aren't in + * memory. * - * Other than fault_in_writeable(), this function is non-destructive. + * Unlike fault_in_writeable(), this function is non-destructive. * * Note that we don't pin or otherwise hold the pages referenced that we fault * in. There's no guarantee that they'll stay in memory for any duration of @@ -1738,46 +1738,27 @@ EXPORT_SYMBOL(fault_in_writeable); */ size_t fault_in_safe_writeable(const char __user *uaddr, size_t size) { - unsigned long start = (unsigned long)untagged_addr(uaddr); - unsigned long end, nstart, nend; + unsigned long start = (unsigned long)uaddr, end; struct mm_struct *mm = current->mm; - struct vm_area_struct *vma = NULL; - int locked = 0; + bool unlocked = false;
- nstart = start & PAGE_MASK; + if (unlikely(size == 0)) + return 0; end = PAGE_ALIGN(start + size); - if (end < nstart) + if (end < start) end = 0; - for (; nstart != end; nstart = nend) { - unsigned long nr_pages; - long ret;
- if (!locked) { - locked = 1; - mmap_read_lock(mm); - vma = find_vma(mm, nstart); - } else if (nstart >= vma->vm_end) - vma = vma->vm_next; - if (!vma || vma->vm_start >= end) - break; - nend = end ? min(end, vma->vm_end) : vma->vm_end; - if (vma->vm_flags & (VM_IO | VM_PFNMAP)) - continue; - if (nstart < vma->vm_start) - nstart = vma->vm_start; - nr_pages = (nend - nstart) / PAGE_SIZE; - ret = __get_user_pages_locked(mm, nstart, nr_pages, - NULL, NULL, &locked, - FOLL_TOUCH | FOLL_WRITE); - if (ret <= 0) + mmap_read_lock(mm); + do { + if (fixup_user_fault(mm, start, FAULT_FLAG_WRITE, &unlocked)) break; - nend = nstart + ret * PAGE_SIZE; - } - if (locked) - mmap_read_unlock(mm); - if (nstart == end) - return 0; - return size - min_t(size_t, nstart - start, size); + start = (start + PAGE_SIZE) & PAGE_MASK; + } while (start != end); + mmap_read_unlock(mm); + + if (size > (unsigned long)uaddr - start) + return size - ((unsigned long)uaddr - start); + return 0; } EXPORT_SYMBOL(fault_in_safe_writeable);