syzbot hit kernel BUG at fs/hugetlbfs/inode.c:532 as described in [1]. This BUG triggers if the HPageRestoreReserve flag is set on a page in the page cache. It should never be set, as the routine huge_add_to_page_cache explicitly clears the flag after adding a page to the cache.

The only code other than huge page allocation which sets the flag is restore_reserve_on_error. It will potentially set the flag in rare out of memory conditions. syzbot was injecting errors to cause memory allocation errors which exercised this specific path.

The code in restore_reserve_on_error is doing the right thing. However, there are instances where pages in the page cache were being passed to restore_reserve_on_error. This is incorrect, as once a page goes into the cache reservation information will not be modified for the page until it is removed from the cache. Error paths do not remove pages from the cache, so even in the case of error, the page will remain in the cache and no reservation adjustment is needed.

Modify routines that potentially call restore_reserve_on_error with a page cache page to no longer do so.

Note on fixes tag: Prior to commit 846be08578ed ("mm/hugetlb: expand restore_reserve_on_error functionality") the routine would not process page cache pages because the HPageRestoreReserve flag is not set on such pages. Therefore, this issue could not be trigggered. The code added by commit 846be08578ed ("mm/hugetlb: expand restore_reserve_on_error functionality") is needed and correct. It exposed incorrect calls to restore_reserve_on_error which is the root cause addressed by this commit.

[1] https://lore.kernel.org/linux-mm/00000000000050776d05c9b7c7f0@google.com/

Fixes: 846be08578ed ("mm/hugetlb: expand restore_reserve_on_error functionality") Reported-by: syzbot+67654e51e54455f1c585@syzkaller.appspotmail.com Signed-off-by: Mike Kravetz mike.kravetz@oracle.com Cc: stable@vger.kernel.org --- mm/hugetlb.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 6337697f7ee4..54c715e7e362 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2546,7 +2546,7 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma, if (!rc) { /* * This indicates there is an entry in the reserve map - * added by alloc_huge_page. We know it was added + * not added by alloc_huge_page. We know it was added * before the alloc_huge_page call, otherwise * HPageRestoreReserve would be set on the page. * Remove the entry so that a subsequent allocation @@ -4753,7 +4753,9 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, spin_unlock(ptl); mmu_notifier_invalidate_range_end(&range); out_release_all: - restore_reserve_on_error(h, vma, haddr, new_page); + /* No restore in case of successful pagetable update (Break COW) */ + if (new_page != old_page) + restore_reserve_on_error(h, vma, haddr, new_page); put_page(new_page); out_release_old: put_page(old_page); @@ -4869,7 +4871,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, pte_t new_pte; spinlock_t *ptl; unsigned long haddr = address & huge_page_mask(h); - bool new_page = false; + bool new_page, new_pagecache_page = false;

/* * Currently, we are forced to kill the process in the event the @@ -4892,6 +4894,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, goto out;

retry: + new_page = false; page = find_lock_page(mapping, idx); if (!page) { /* Check for page in userfault range */ @@ -4935,6 +4938,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, goto retry; goto out; } + new_pagecache_page = true; } else { lock_page(page); if (unlikely(anon_vma_prepare(vma))) { @@ -5019,7 +5023,9 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, spin_unlock(ptl); backout_unlocked: unlock_page(page); - restore_reserve_on_error(h, vma, haddr, page); + /* restore reserve for newly allocated pages not in page cache */ + if (new_page && !new_pagecache_page) + restore_reserve_on_error(h, vma, haddr, page); put_page(page); goto out; } @@ -5228,6 +5234,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, int ret = -ENOMEM; struct page *page; int writable; + bool new_pagecache_page = false;

if (is_continue) { ret = -EFAULT; @@ -5321,6 +5328,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, ret = huge_add_to_page_cache(page, mapping, idx); if (ret) goto out_release_nounlock; + new_pagecache_page = true; }

ptl = huge_pte_lockptr(h, dst_mm, dst_pte); @@ -5384,7 +5392,8 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, if (vm_shared || is_continue) unlock_page(page); out_release_nounlock: - restore_reserve_on_error(h, dst_vma, dst_addr, page); + if (!new_pagecache_page) + restore_reserve_on_error(h, dst_vma, dst_addr, page); put_page(page); goto out; }