From: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx> [ Upstream commit 4080ef1579b2413435413988d14ac8c68e4d42c8 ] Incorrect invocation of VMA callbacks when the VMA is no longer in a consistent state is bug prone and risky to perform. With regards to the important vm_ops->close() callback We have gone to great lengths to try to track whether or not we ought to close VMAs. Rather than doing so and risking making a mistake somewhere, instead unconditionally close and reset vma->vm_ops to an empty dummy operations set with a NULL .close operator. We introduce a new function to do so - vma_close() - and simplify existing vms logic which tracked whether we needed to close or not. This simplifies the logic, avoids incorrect double-calling of the .close() callback and allows us to update error paths to simply call vma_close() unconditionally - making VMA closure idempotent. Link: https://lkml.kernel.org/r/28e89dda96f68c505cb6f8e9fc9b57c3e9f74b42.1730224667.git.lorenzo.stoakes@xxxxxxxxxx Fixes: deb0f6562884 ("mm/mmap: undo ->mmap() when arch_validate_flags() fails") Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx> Reported-by: Jann Horn <jannh@xxxxxxxxxx> Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx> Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> Reviewed-by: Jann Horn <jannh@xxxxxxxxxx> Cc: Andreas Larsson <andreas@xxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Cc: Helge Deller <deller@xxxxxx> Cc: James E.J. Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Mark Brown <broonie@xxxxxxxxxx> Cc: Peter Xu <peterx@xxxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/internal.h | 18 ++++++++++++++++++ mm/mmap.c | 9 +++------ mm/nommu.c | 3 +-- 3 files changed, 22 insertions(+), 8 deletions(-) --- a/mm/internal.h +++ b/mm/internal.h @@ -110,6 +110,24 @@ static inline int mmap_file(struct file return err; } +/* + * If the VMA has a close hook then close it, and since closing it might leave + * it in an inconsistent state which makes the use of any hooks suspect, clear + * them down by installing dummy empty hooks. + */ +static inline void vma_close(struct vm_area_struct *vma) +{ + if (vma->vm_ops && vma->vm_ops->close) { + vma->vm_ops->close(vma); + + /* + * The mapping is in an inconsistent state, and no further hooks + * may be invoked upon it. + */ + vma->vm_ops = &vma_dummy_vm_ops; + } +} + void __acct_reclaim_writeback(pg_data_t *pgdat, struct folio *folio, int nr_throttled); static inline void acct_reclaim_writeback(struct folio *folio) --- a/mm/mmap.c +++ b/mm/mmap.c @@ -137,8 +137,7 @@ void unlink_file_vma(struct vm_area_stru static void remove_vma(struct vm_area_struct *vma, bool unreachable) { might_sleep(); - if (vma->vm_ops && vma->vm_ops->close) - vma->vm_ops->close(vma); + vma_close(vma); if (vma->vm_file) fput(vma->vm_file); mpol_put(vma_policy(vma)); @@ -2899,8 +2898,7 @@ expanded: return addr; close_and_free_vma: - if (file && vma->vm_ops && vma->vm_ops->close) - vma->vm_ops->close(vma); + vma_close(vma); if (file || vma->vm_file) { unmap_and_free_vma: @@ -3392,8 +3390,7 @@ struct vm_area_struct *copy_vma(struct v return new_vma; out_vma_link: - if (new_vma->vm_ops && new_vma->vm_ops->close) - new_vma->vm_ops->close(new_vma); + vma_close(new_vma); if (new_vma->vm_file) fput(new_vma->vm_file); --- a/mm/nommu.c +++ b/mm/nommu.c @@ -600,8 +600,7 @@ static int delete_vma_from_mm(struct vm_ */ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) { - if (vma->vm_ops && vma->vm_ops->close) - vma->vm_ops->close(vma); + vma_close(vma); if (vma->vm_file) fput(vma->vm_file); put_nommu_region(vma->vm_region); Patches currently in stable-queue which might be from lorenzo.stoakes@xxxxxxxxxx are queue-6.6/mm-resolve-faulty-mmap_region-error-path-behaviour.patch queue-6.6/mm-refactor-arch_calc_vm_flag_bits-and-arm64-mte-handling.patch queue-6.6/mm-unconditionally-close-vmas-on-error.patch queue-6.6/mm-avoid-unsafe-vma-hook-invocation-when-error-arises-on-mmap-hook.patch queue-6.6/mm-refactor-map_deny_write_exec.patch
