Re: [linux-next:master] [netfs] a05b682d49: BUG:KASAN:slab-use-after-free_in_copy_from_iter

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hi, David,

On Wed, Sep 18, 2024 at 12:27:48PM +0100, David Howells wrote:
> David Howells <dhowells@xxxxxxxxxx> wrote:
> 
> > Does this:
> > 
> > https://lore.kernel.org/linux-fsdevel/2280667.1726594254@xxxxxxxxxxxxxxxxxxxxxx/T/#u
> > 
> > 	[PATCH] cifs: Fix reversion of the iter in cifs_readv_receive()
> > 
> > help?
> 
> Actually, it probably won't.  The issue seems to be one I'm already trying to
> reproduce that Steve has flagged.
> 
> Can you tell me SMB server you're using?  Samba, ksmbd, Windows, Azure?  I'm
> guessing one of the first two.

we actually use local mount to simulate smb. I attached an output for details.

2024-09-11 23:30:58 mkdir -p /cifs/sda1
2024-09-11 23:30:58 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda1 /cifs/sda1
mount cifs success
2024-09-11 23:30:58 mkdir -p /cifs/sda2
2024-09-11 23:30:58 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda2 /cifs/sda2
mount cifs success
2024-09-11 23:30:59 mkdir -p /cifs/sda3
2024-09-11 23:30:59 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda3 /cifs/sda3
mount cifs success
2024-09-11 23:30:59 mkdir -p /cifs/sda4
2024-09-11 23:30:59 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda4 /cifs/sda4
mount cifs success


2024-09-11 23:31:00 mount /dev/sda1 /fs/sda1
2024-09-11 23:31:01 mkdir -p /smbv2//cifs/sda1
2024-09-11 23:31:01 export FSTYP=cifs
2024-09-11 23:31:01 export TEST_DEV=//localhost/fs/sda1
2024-09-11 23:31:01 export TEST_DIR=/smbv2//cifs/sda1
2024-09-11 23:31:01 export CIFS_MOUNT_OPTIONS=-ousername=root,password=pass,noperm,vers=2.0,mfsymlinks,actimeo=0
2024-09-11 23:31:01 sed "s:^:generic/:" //lkp/benchmarks/xfstests/tests/generic-group-07
2024-09-11 23:31:01 ./check -E tests/cifs/exclude.incompatible-smb2.txt -E tests/cifs/exclude.very-slow.txt generic/071 generic/072 generic/074 generic/075 generic/076 generic/078 generic/079


> 
> Also, will your reproducer really clobber four arbitrary partitions on sdb?

yeah, we setup dedicated hdd for tests on each test machine, e.g. for the
lkp-skl-d05 used in the test, it has:

nr_hdd_partitions: 4
hdd_partitions: /dev/disk/by-id/wwn-0x5000c50091e544de-part*

then in this 4HDD-ext4-smbv2-generic-group-07 test, also as in attached output

2024-09-11 23:26:17 wipefs -a --force /dev/sda1
/dev/sda1: 2 bytes were erased at offset 0x00000438 (ext4): 53 ef
2024-09-11 23:26:17 wipefs -a --force /dev/sda2
2024-09-11 23:26:17 wipefs -a --force /dev/sda3
2024-09-11 23:26:17 wipefs -a --force /dev/sda4
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda1
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda3
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda2
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda4


I also attached 074.full. KASAN issue occurs while this 074 test
in generic-group-07.

> 
> David
> 
==> /tmp/stdout <==

==> /tmp/stderr <==

==> /tmp/stdout <==
RESULT_ROOT=/result/xfstests/4HDD-ext4-smbv2-generic-group-07/lkp-skl-d05/debian-12-x86_64-20240206.cgz/x86_64-rhel-8.3-func/gcc-12/a05b682d498a81ca12f1dd964f06f3aec48af595/0
job=/lkp/jobs/scheduled/lkp-skl-d05/xfstests-4HDD-ext4-smbv2-generic-group-07-debian-12-x86_64-20240206.cgz-a05b682d498a-20240912-365474-1kx9t2n-0.yaml
result_service: raw_upload, RESULT_MNT: /internal-lkp-server/result, RESULT_ROOT: /internal-lkp-server/result/xfstests/4HDD-ext4-smbv2-generic-group-07/lkp-skl-d05/debian-12-x86_64-20240206.cgz/x86_64-rhel-8.3-func/gcc-12/a05b682d498a81ca12f1dd964f06f3aec48af595/0, TMP_RESULT_ROOT: /tmp/lkp/result
run-job /lkp/jobs/scheduled/lkp-skl-d05/xfstests-4HDD-ext4-smbv2-generic-group-07-debian-12-x86_64-20240206.cgz-a05b682d498a-20240912-365474-1kx9t2n-0.yaml
/usr/bin/wget -q --timeout=3600 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/jobs/scheduled/lkp-skl-d05/xfstests-4HDD-ext4-smbv2-generic-group-07-debian-12-x86_64-20240206.cgz-a05b682d498a-20240912-365474-1kx9t2n-0.yaml&job_state=running -O /dev/null
target ucode: 0xf0
LKP: stdout: 1226: current_version: f0, target_version: f0
2024-09-11 23:26:16 dmsetup remove_all
2024-09-11 23:26:17 wipefs -a --force /dev/sda1
/dev/sda1: 2 bytes were erased at offset 0x00000438 (ext4): 53 ef
2024-09-11 23:26:17 wipefs -a --force /dev/sda2
2024-09-11 23:26:17 wipefs -a --force /dev/sda3
2024-09-11 23:26:17 wipefs -a --force /dev/sda4
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda1
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda3
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda2
2024-09-11 23:26:17 mkfs -t ext4 -q -E lazy_itable_init=0,lazy_journal_init=0 -F /dev/sda4
2024-09-11 23:30:56 mkdir -p /fs/sda1
	ext4
2024-09-11 23:30:56 mount -t ext4 /dev/sda1 /fs/sda1
2024-09-11 23:30:56 mkdir -p /fs/sda2
	ext4
2024-09-11 23:30:56 mount -t ext4 /dev/sda2 /fs/sda2
2024-09-11 23:30:57 mkdir -p /fs/sda3
	ext4
2024-09-11 23:30:57 mount -t ext4 /dev/sda3 /fs/sda3
2024-09-11 23:30:57 mkdir -p /fs/sda4
	ext4
2024-09-11 23:30:57 mount -t ext4 /dev/sda4 /fs/sda4
Added user root.
2024-09-11 23:30:58 mkdir -p /cifs/sda1
2024-09-11 23:30:58 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda1 /cifs/sda1
mount cifs success
2024-09-11 23:30:58 mkdir -p /cifs/sda2
2024-09-11 23:30:58 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda2 /cifs/sda2
mount cifs success
2024-09-11 23:30:59 mkdir -p /cifs/sda3
2024-09-11 23:30:59 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda3 /cifs/sda3
mount cifs success
2024-09-11 23:30:59 mkdir -p /cifs/sda4
2024-09-11 23:30:59 timeout 5m mount -t cifs -o vers=2.0 -o user=root,password=pass //localhost/fs/sda4 /cifs/sda4
mount cifs success
check_nr_cpu
CPU(s):                               4
On-line CPU(s) list:                  0-3
Model name:                           Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
BIOS Model name:                      Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz  CPU @ 3.2GHz
Thread(s) per core:                   1
Core(s) per socket:                   4
Socket(s):                            1
CPU(s) scaling MHz:                   94%
NUMA node(s):                         1
NUMA node0 CPU(s):                    0-3

==> /tmp/stderr <==
512+0 records in
512+0 records out
262144 bytes (262 kB, 256 KiB) copied, 0.013281 s, 19.7 MB/s
512+0 records in
512+0 records out
262144 bytes (262 kB, 256 KiB) copied, 0.090282 s, 2.9 MB/s
512+0 records in
512+0 records out
262144 bytes (262 kB, 256 KiB) copied, 0.0451926 s, 5.8 MB/s

==> /tmp/stdout <==
2024-09-11 23:31:00 mount /dev/sda1 /fs/sda1
2024-09-11 23:31:01 mkdir -p /smbv2//cifs/sda1
2024-09-11 23:31:01 export FSTYP=cifs
2024-09-11 23:31:01 export TEST_DEV=//localhost/fs/sda1
2024-09-11 23:31:01 export TEST_DIR=/smbv2//cifs/sda1
2024-09-11 23:31:01 export CIFS_MOUNT_OPTIONS=-ousername=root,password=pass,noperm,vers=2.0,mfsymlinks,actimeo=0
2024-09-11 23:31:01 sed "s:^:generic/:" //lkp/benchmarks/xfstests/tests/generic-group-07
2024-09-11 23:31:01 ./check -E tests/cifs/exclude.incompatible-smb2.txt -E tests/cifs/exclude.very-slow.txt generic/071 generic/072 generic/074 generic/075 generic/076 generic/078 generic/079
IPMI BMC is not supported on this machine, skip bmc-watchdog setup!
FSTYP         -- cifs
PLATFORM      -- Linux/x86_64 lkp-skl-d05 6.11.0-rc6-00065-ga05b682d498a #1 SMP PREEMPT_DYNAMIC Thu Sep 12 06:26:04 CST 2024

generic/071       [not run] this test requires a valid $SCRATCH_DEV
generic/072       [not run] xfs_io fcollapse  failed (old kernel/wrong fs?)
generic/074       _check_dmesg: something found in dmesg (see /lkp/benchmarks/xfstests/results//generic/074.dmesg)

generic/075        95s
generic/076       [not run] this test requires a valid $SCRATCH_DEV
generic/078       [not run] kernel doesn't support renameat2 syscall
generic/079       [not run] file system doesn't support chattr +ia
Ran: generic/071 generic/072 generic/074 generic/075 generic/076 generic/078 generic/079
Not run: generic/071 generic/072 generic/076 generic/078 generic/079
Failures: generic/074
Failed 1 of 7 tests

Params are for Linux SMP
Params: n = 3 l = 10 f = 5
num_children=1 file_size=1048576 num_files=1 loop_count=10 block_size=1024
mmap=0 sync=0 prealloc=0
Total data size 1.0 Mbyte
Child 0 loop 0
Child 0 loop 1
Child 0 loop 2
Child 0 loop 3
Child 0 loop 4
Child 0 loop 5
Child 0 loop 6
Child 0 loop 7
Child 0 loop 8
Child 0 loop 9
Child 0 cleaning up /smbv2/cifs/sda1/fstest.0/child0
num_children=1 file_size=1048576 num_files=1 loop_count=10 block_size=1024
mmap=0 sync=0 prealloc=0
Total data size 1.0 Mbyte
num_children=1 file_size=10485760 num_files=1 loop_count=10 block_size=8192
mmap=1 sync=0 prealloc=0
Total data size 10.5 Mbyte
Child 0 loop 0
Child 0 loop 1
Child 0 loop 2
Child 0 loop 3
Child 0 loop 4
Child 0 loop 5
Child 0 loop 6
Child 0 loop 7
Child 0 loop 8
Child 0 loop 9
Child 0 cleaning up /smbv2/cifs/sda1/fstest.1/child0
num_children=1 file_size=10485760 num_files=1 loop_count=10 block_size=8192
mmap=1 sync=0 prealloc=0
Total data size 10.5 Mbyte
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=0 sync=0 prealloc=0
Total data size 471.9 Mbyte
Child 0 loop 0
Child 0 loop 1
Child 0 loop 2
Child 0 loop 3
Child 0 loop 4
Child 0 loop 5
Child 0 loop 6
Child 0 loop 7
Child 0 loop 8
Child 0 loop 9
Child 0 cleaning up /smbv2/cifs/sda1/fstest.2/child0
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=0 sync=0 prealloc=0
Total data size 471.9 Mbyte
Child 1 loop 0
Child 1 loop 1
Child 1 loop 2
Child 1 loop 3
Child 1 loop 4
Child 1 loop 5
Child 1 loop 6
Child 1 loop 7
Child 1 loop 8
Child 1 loop 9
Child 1 cleaning up /smbv2/cifs/sda1/fstest.2/child1
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=0 sync=0 prealloc=0
Total data size 471.9 Mbyte
Child 2 loop 0
Child 2 loop 1
Child 2 loop 2
Child 2 loop 3
Child 2 loop 4
Child 2 loop 5
Child 2 loop 6
Child 2 loop 7
Child 2 loop 8
Child 2 loop 9
Child 2 cleaning up /smbv2/cifs/sda1/fstest.2/child2
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=0 sync=0 prealloc=0
Total data size 471.9 Mbyte
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=1 sync=0 prealloc=0
Total data size 471.9 Mbyte
Child 0 loop 0
Child 0 loop 1
Child 0 loop 2
Child 0 loop 3
Child 0 loop 4
Child 0 loop 5
Child 0 loop 6
Child 0 loop 7
Child 0 loop 8
Child 0 loop 9
Child 0 cleaning up /smbv2/cifs/sda1/fstest.3/child0
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=1 sync=0 prealloc=0
Total data size 471.9 Mbyte
Child 2 loop 0
Child 2 loop 1
Child 2 loop 2
Child 2 loop 3
Child 2 loop 4
Child 2 loop 5
Child 2 loop 6
Child 2 loop 7
Child 2 loop 8
Child 2 loop 9
Child 2 cleaning up /smbv2/cifs/sda1/fstest.3/child2
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=1 sync=0 prealloc=0
Total data size 471.9 Mbyte
Child 1 loop 0
Child 1 loop 1
Child 1 loop 2
Child 1 loop 3
Child 1 loop 4
Child 1 loop 5
Child 1 loop 6
Child 1 loop 7
Child 1 loop 8
Child 1 loop 9
Child 1 cleaning up /smbv2/cifs/sda1/fstest.3/child1
num_children=3 file_size=31457280 num_files=5 loop_count=10 block_size=512
mmap=1 sync=0 prealloc=0
Total data size 471.9 Mbyte
num_children=3 file_size=10485760 num_files=5 loop_count=10 block_size=512
mmap=1 sync=1 prealloc=0
Total data size 157.3 Mbyte
Child 2 loop 0
Child 2 loop 1
Child 2 loop 2
Child 2 loop 3
Child 2 loop 4
Child 2 loop 5
Child 2 loop 6
Child 2 loop 7
Child 2 loop 8
Child 2 loop 9
Child 2 cleaning up /smbv2/cifs/sda1/fstest.4/child2
num_children=3 file_size=10485760 num_files=5 loop_count=10 block_size=512
mmap=1 sync=1 prealloc=0
Total data size 157.3 Mbyte
Child 0 loop 0
Child 0 loop 1
Child 0 loop 2
Child 0 loop 3
Child 0 loop 4
Child 0 loop 5
Child 0 loop 6
Child 0 loop 7
Child 0 loop 8
Child 0 loop 9
Child 0 cleaning up /smbv2/cifs/sda1/fstest.4/child0
num_children=3 file_size=10485760 num_files=5 loop_count=10 block_size=512
mmap=1 sync=1 prealloc=0
Total data size 157.3 Mbyte
Child 1 loop 0
Child 1 loop 1
Child 1 loop 2
Child 1 loop 3
Child 1 loop 4
Child 1 loop 5
Child 1 loop 6
Child 1 loop 7
Child 1 loop 8
Child 1 loop 9
Child 1 cleaning up /smbv2/cifs/sda1/fstest.4/child1
num_children=3 file_size=10485760 num_files=5 loop_count=10 block_size=512
mmap=1 sync=1 prealloc=0
Total data size 157.3 Mbyte

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