linux-kernel - Re: [PATCH 6.6.y 0/5] fix error handling in mmap

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Message-ID: <cee4e74b-3d27-4c78-acea-788fff2bc3c2@suse.cz>
Date: Fri, 15 Nov 2024 18:17:18 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, stable@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jann Horn <jannh@...gle.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 Linus Torvalds <torvalds@...ux-foundation.org>, Peter Xu
 <peterx@...hat.com>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Mark Brown <broonie@...nel.org>,
 "David S . Miller" <davem@...emloft.net>,
 Andreas Larsson <andreas@...sler.com>,
 "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
 Helge Deller <deller@....de>
Subject: Re: [PATCH 6.6.y 0/5] fix error handling in mmap_region() and
 refactor (hotfixes)

On 11/15/24 13:41, Lorenzo Stoakes wrote:
> Critical fixes for mmap_region(), backported to 6.6.y.
> 
> Some notes on differences from upstream:
> 
> * In this kernel is_shared_maywrite() does not exist and the code uses
>   VM_SHARED to determine whether mapping_map_writable() /
>   mapping_unmap_writable() should be invoked. This backport therefore
>   follows suit.
> 
> * Each version of these series is confronted by a slightly different
>   mmap_region(), so we must adapt the change for each stable version. The
>   approach remains the same throughout, however, and we correctly avoid
>   closing the VMA part way through any __mmap_region() operation.
> 
> Lorenzo Stoakes (5):
>   mm: avoid unsafe VMA hook invocation when error arises on mmap hook
>   mm: unconditionally close VMAs on error
>   mm: refactor map_deny_write_exec()
>   mm: refactor arch_calc_vm_flag_bits() and arm64 MTE handling
>   mm: resolve faulty mmap_region() error path behaviour

I don't know if review tags are actually applied to stable backports on top
of the original reviews, but I've checked so FTR:

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

>  arch/arm64/include/asm/mman.h  |  10 ++-
>  arch/parisc/include/asm/mman.h |   5 +-
>  include/linux/mman.h           |  28 ++++++--
>  mm/internal.h                  |  45 ++++++++++++
>  mm/mmap.c                      | 128 ++++++++++++++++++---------------
>  mm/mprotect.c                  |   2 +-
>  mm/nommu.c                     |   9 ++-
>  mm/shmem.c                     |   3 -
>  8 files changed, 153 insertions(+), 77 deletions(-)
> 
> --
> 2.47.0