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boundary="aZfYHwo7F5DMetLyBrY01O8raAzjm5hgO" --aZfYHwo7F5DMetLyBrY01O8raAzjm5hgO Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020/7/31 =E4=B8=8B=E5=8D=886:20, Qu Wenruo wrote: >=20 >=20 > On 2020/7/31 =E4=B8=8B=E5=8D=886:05, Filipe Manana wrote: >> On Fri, Jul 31, 2020 at 10:49 AM Qu Wenruo wrote: >>> >>> [BUG] >>> The following script can lead to tons of beyond device boundary acces= s: >>> >>> mkfs.btrfs -f $dev -b 10G >>> mount $dev $mnt >>> trimfs $mnt >>> btrfs filesystem resize 1:-1G $mnt >>> trimfs $mnt >>> >>> [CAUSE] >>> Since commit 929be17a9b49 ("btrfs: Switch btrfs_trim_free_extents to >>> find_first_clear_extent_bit"), we try to avoid trimming ranges that's= >>> already trimmed. >>> >>> So we check device->alloc_state by finding the first range which does= n't >>> have CHUNK_TRIMMED and CHUNK_ALLOCATED not set. >>> >>> But if we shrunk the device, that bits are not cleared, thus we could= >>> easily got a range starts beyond the shrunk device size. >>> >>> This results the returned @start and @end are all beyond device size,= >>> then we call "end =3D min(end, device->total_bytes -1);" making @end >>> smaller than device size. >>> >>> Then finally we goes "len =3D end - start + 1", totally underflow the= >>> result, and lead to the beyond-device-boundary access. >>> >>> [FIX] >>> This patch will fix the problem in two ways: >>> - Clear CHUNK_TRIMMED | CHUNK_ALLOCATED bits when shrinking device >>> This is the root fix >>> >>> - Add extra safe net when trimming free device extents >>> We check and warn if the returned range is already beyond current >>> device. >>> >>> Link: https://github.com/kdave/btrfs-progs/issues/282 >>> Fixes: 929be17a9b49 ("btrfs: Switch btrfs_trim_free_extents to find_f= irst_clear_extent_bit") >>> Signed-off-by: Qu Wenruo >>> Reviewed-by: Filipe Manana >>> --- >>> Changelog: >>> v2: >>> - Add proper fixes tag >>> - Add extra warning for beyond device end case >>> - Add graceful exit for already trimmed case >>> v3: >>> - Don't return EUCLEAN for beyond boundary access >>> - Rephrase the warning message for beyond boundary access >>> --- >>> fs/btrfs/extent-tree.c | 21 +++++++++++++++++++++ >>> fs/btrfs/volumes.c | 12 ++++++++++++ >>> 2 files changed, 33 insertions(+) >>> >>> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c >>> index fa7d83051587..7c5e0961c93b 100644 >>> --- a/fs/btrfs/extent-tree.c >>> +++ b/fs/btrfs/extent-tree.c >>> @@ -33,6 +33,7 @@ >>> #include "delalloc-space.h" >>> #include "block-group.h" >>> #include "discard.h" >>> +#include "rcu-string.h" >>> >>> #undef SCRAMBLE_DELAYED_REFS >>> >>> @@ -5669,6 +5670,26 @@ static int btrfs_trim_free_extents(struct btrf= s_device *device, u64 *trimmed) >>> &start, &end, >>> CHUNK_TRIMMED | CHUNK_ALL= OCATED); >>> >>> + /* CHUNK_* bits not cleared properly */ >>> + if (start > device->total_bytes) { >>> + WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG)); >>> + btrfs_warn_in_rcu(fs_info, >>> +"ignoring attempt to trim beyond device size: offset %llu length %ll= u device %s device size %llu", >>> + start, end - start + 1, >>> + rcu_str_deref(device->name)= , >>> + device->total_bytes); >>> + mutex_unlock(&fs_info->chunk_mutex); >>> + ret =3D 0; >>> + break; >>> + } >>> + >>> + /* The remaining part has already been trimmed */ >>> + if (start =3D=3D device->total_bytes) { >>> + mutex_unlock(&fs_info->chunk_mutex); >>> + ret =3D 0; >>> + break; >>> + } >> >> Sorry I missed this earlier, but why is this a special case? Couldn't >> this be merged into the previous check? >> Why is an offset matching the ending of the device not considered unex= pected? >=20 > For such example: > 0 1g 2g > device 1: |///////////////| | > |//| =3D Allocated space > | | =3D Free space. >=20 > After one fstrim, [1G, 2G) get trimmed. > So in the alloc_state we have > 0 1G 2G > device 1: | |***************| > |**| =3D CHUNK_TRIMMED bits set >=20 > Here we just focus on the unallocated space, ignoring the block group p= arts. >=20 > Then we run fstrim again. > We call find_first_clear_extent_bit(start =3D=3D 1G), then we got the r= esult > start =3D=3D 2G, end =3D U64_MAX. >=20 > In that case, we got start =3D=3D device->total_bytes, and it's complet= ely > valid. Sorry, although this is correct, it's duplicated with the later checks: end =3D min(end, device->total_bytes - 1); len =3D end - start + 1; /* We didn't find any extents */ if (!len) { mutex_unlock(&fs_info->chunk_mutex); ret =3D 0; break; } If we got a returned start =3D=3D device->total_bytes, then here we would= hit len =3D=3D 0, and exit. So my (start =3D=3D device->total_bytes) is duplicated. I guess the existing one is easier to understand, thus my extra check should be removed. Thanks, Qu >=20 >> >> I also don't understand the comment, what is the remaining part? >=20 > The remaining means the unallocated space from the @start of > find_first_clear_extent_bit(). >=20 > Any better suggestion? >=20 > Thanks, > Qu >=20 >> >> Thanks. >> >>> + >>> /* Ensure we skip the reserved area in the first 1M *= / >>> start =3D max_t(u64, start, SZ_1M); >>> >>> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c >>> index d7670e2a9f39..4e51ef68ea72 100644 >>> --- a/fs/btrfs/volumes.c >>> +++ b/fs/btrfs/volumes.c >>> @@ -4720,6 +4720,18 @@ int btrfs_shrink_device(struct btrfs_device *d= evice, u64 new_size) >>> } >>> >>> mutex_lock(&fs_info->chunk_mutex); >>> + /* >>> + * Also clear any CHUNK_TRIMMED and CHUNK_ALLOCATED bits beyo= nd the >>> + * current device boundary. >>> + * This shouldn't fail, as alloc_state should only utilize th= ose two >>> + * bits, thus we shouldn't alloc new memory for clearing the = status. >>> + * >>> + * So here we just do an ASSERT() to catch future behavior ch= ange. >>> + */ >>> + ret =3D clear_extent_bits(&device->alloc_state, new_size, (u6= 4)-1, >>> + CHUNK_TRIMMED | CHUNK_ALLOCATED); >>> + ASSERT(!ret); >>> + >>> btrfs_device_set_disk_total_bytes(device, new_size); >>> if (list_empty(&device->post_commit_list)) >>> list_add_tail(&device->post_commit_list, >>> -- >>> 2.28.0 >>> >> >> >=20 --aZfYHwo7F5DMetLyBrY01O8raAzjm5hgO-- --NWSlOCKu9XnPPa14Bfs6tySFlv6tuJeO5 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAl8j9I0ACgkQwj2R86El /qj7XAgArT+fKqZClX+e/+3KEnbLvPCLnfPEtBUWi0SsmzSk3x+j32phpdERLNV3 TebADsxN6kq9lX6lYxVsxLaGQ16f5U4y9SBnZzhPJalCchKRYXz6sZdvth4nvSs0 aELdflVVsoPyIyTuE9rdPMCQvklnC7mALQbIo5sieWUTAadX0FO+konifAAm17F1 hzFNc4aU4Isyei6LJVKDg2kKUQLlkf0GkYg2uxSF7V2LhwR1efMPFVQpovS79YXo 4dqfvl5/LXDcduPNUdz1ZrUS4RDPofn3d/Uo8Qj8DMmBfpDvKb85I7Nq+UAN0jVB AERVBFRnWiYhxl/Oudh1XD/Pf3bCmA== =9Sms -----END PGP SIGNATURE----- --NWSlOCKu9XnPPa14Bfs6tySFlv6tuJeO5--