* FAILED: patch "[PATCH] Squashfs: reject negative file sizes in squashfs_read_inode()" failed to apply to 5.15-stable tree
@ 2025-10-13 7:49 gregkh
2025-10-13 21:45 ` [PATCH 5.15.y 1/2] Squashfs: add additional inode sanity checking Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: gregkh @ 2025-10-13 7:49 UTC (permalink / raw)
To: phillip, akpm, amir73il, stable; +Cc: stable
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 9f1c14c1de1bdde395f6cc893efa4f80a2ae3b2b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025101321-update-disprove-8836@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 9f1c14c1de1bdde395f6cc893efa4f80a2ae3b2b Mon Sep 17 00:00:00 2001
From: Phillip Lougher <phillip@squashfs.org.uk>
Date: Fri, 26 Sep 2025 22:59:35 +0100
Subject: [PATCH] Squashfs: reject negative file sizes in squashfs_read_inode()
Syskaller reports a "WARNING in ovl_copy_up_file" in overlayfs.
This warning is ultimately caused because the underlying Squashfs file
system returns a file with a negative file size.
This commit checks for a negative file size and returns EINVAL.
[phillip@squashfs.org.uk: only need to check 64 bit quantity]
Link: https://lkml.kernel.org/r/20250926222305.110103-1-phillip@squashfs.org.uk
Link: https://lkml.kernel.org/r/20250926215935.107233-1-phillip@squashfs.org.uk
Fixes: 6545b246a2c8 ("Squashfs: inode operations")
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reported-by: syzbot+f754e01116421e9754b9@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/68d580e5.a00a0220.303701.0019.GAE@google.com/
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index ddc65d006063..cceae3b78698 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -197,6 +197,10 @@ int squashfs_read_inode(struct inode *inode, long long ino)
goto failed_read;
inode->i_size = le64_to_cpu(sqsh_ino->file_size);
+ if (inode->i_size < 0) {
+ err = -EINVAL;
+ goto failed_read;
+ }
frag = le32_to_cpu(sqsh_ino->fragment);
if (frag != SQUASHFS_INVALID_FRAG) {
/*
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 5.15.y 1/2] Squashfs: add additional inode sanity checking
2025-10-13 7:49 FAILED: patch "[PATCH] Squashfs: reject negative file sizes in squashfs_read_inode()" failed to apply to 5.15-stable tree gregkh
@ 2025-10-13 21:45 ` Sasha Levin
2025-10-13 21:45 ` [PATCH 5.15.y 2/2] Squashfs: reject negative file sizes in squashfs_read_inode() Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: Sasha Levin @ 2025-10-13 21:45 UTC (permalink / raw)
To: stable; +Cc: Phillip Lougher, Andrew Morton, Sasha Levin
From: Phillip Lougher <phillip@squashfs.org.uk>
[ Upstream commit 9ee94bfbe930a1b39df53fa2d7b31141b780eb5a ]
Patch series "Squashfs: performance improvement and a sanity check".
This patchset adds an additional sanity check when reading regular file
inodes, and adds support for SEEK_DATA/SEEK_HOLE lseek() whence values.
This patch (of 2):
Add an additional sanity check when reading regular file inodes.
A regular file if the file size is an exact multiple of the filesystem
block size cannot have a fragment. This is because by definition a
fragment block stores tailends which are not a whole block in size.
Link: https://lkml.kernel.org/r/20250923220652.568416-1-phillip@squashfs.org.uk
Link: https://lkml.kernel.org/r/20250923220652.568416-2-phillip@squashfs.org.uk
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 9f1c14c1de1b ("Squashfs: reject negative file sizes in squashfs_read_inode()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/squashfs/inode.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index 95a9ff9e23997..eb6f577154d59 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -140,8 +140,17 @@ int squashfs_read_inode(struct inode *inode, long long ino)
if (err < 0)
goto failed_read;
+ inode->i_size = le32_to_cpu(sqsh_ino->file_size);
frag = le32_to_cpu(sqsh_ino->fragment);
if (frag != SQUASHFS_INVALID_FRAG) {
+ /*
+ * the file cannot have a fragment (tailend) and have a
+ * file size a multiple of the block size
+ */
+ if ((inode->i_size & (msblk->block_size - 1)) == 0) {
+ err = -EINVAL;
+ goto failed_read;
+ }
frag_offset = le32_to_cpu(sqsh_ino->offset);
frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
if (frag_size < 0) {
@@ -155,7 +164,6 @@ int squashfs_read_inode(struct inode *inode, long long ino)
}
set_nlink(inode, 1);
- inode->i_size = le32_to_cpu(sqsh_ino->file_size);
inode->i_fop = &generic_ro_fops;
inode->i_mode |= S_IFREG;
inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
@@ -183,8 +191,17 @@ int squashfs_read_inode(struct inode *inode, long long ino)
if (err < 0)
goto failed_read;
+ inode->i_size = le64_to_cpu(sqsh_ino->file_size);
frag = le32_to_cpu(sqsh_ino->fragment);
if (frag != SQUASHFS_INVALID_FRAG) {
+ /*
+ * the file cannot have a fragment (tailend) and have a
+ * file size a multiple of the block size
+ */
+ if ((inode->i_size & (msblk->block_size - 1)) == 0) {
+ err = -EINVAL;
+ goto failed_read;
+ }
frag_offset = le32_to_cpu(sqsh_ino->offset);
frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
if (frag_size < 0) {
@@ -199,7 +216,6 @@ int squashfs_read_inode(struct inode *inode, long long ino)
xattr_id = le32_to_cpu(sqsh_ino->xattr);
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
- inode->i_size = le64_to_cpu(sqsh_ino->file_size);
inode->i_op = &squashfs_inode_ops;
inode->i_fop = &generic_ro_fops;
inode->i_mode |= S_IFREG;
--
2.51.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 5.15.y 2/2] Squashfs: reject negative file sizes in squashfs_read_inode()
2025-10-13 21:45 ` [PATCH 5.15.y 1/2] Squashfs: add additional inode sanity checking Sasha Levin
@ 2025-10-13 21:45 ` Sasha Levin
0 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2025-10-13 21:45 UTC (permalink / raw)
To: stable
Cc: Phillip Lougher, syzbot+f754e01116421e9754b9, Amir Goldstein,
Andrew Morton, Sasha Levin
From: Phillip Lougher <phillip@squashfs.org.uk>
[ Upstream commit 9f1c14c1de1bdde395f6cc893efa4f80a2ae3b2b ]
Syskaller reports a "WARNING in ovl_copy_up_file" in overlayfs.
This warning is ultimately caused because the underlying Squashfs file
system returns a file with a negative file size.
This commit checks for a negative file size and returns EINVAL.
[phillip@squashfs.org.uk: only need to check 64 bit quantity]
Link: https://lkml.kernel.org/r/20250926222305.110103-1-phillip@squashfs.org.uk
Link: https://lkml.kernel.org/r/20250926215935.107233-1-phillip@squashfs.org.uk
Fixes: 6545b246a2c8 ("Squashfs: inode operations")
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reported-by: syzbot+f754e01116421e9754b9@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/68d580e5.a00a0220.303701.0019.GAE@google.com/
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/squashfs/inode.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index eb6f577154d59..f32db16dc18ba 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -192,6 +192,10 @@ int squashfs_read_inode(struct inode *inode, long long ino)
goto failed_read;
inode->i_size = le64_to_cpu(sqsh_ino->file_size);
+ if (inode->i_size < 0) {
+ err = -EINVAL;
+ goto failed_read;
+ }
frag = le32_to_cpu(sqsh_ino->fragment);
if (frag != SQUASHFS_INVALID_FRAG) {
/*
--
2.51.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2025-10-13 7:49 FAILED: patch "[PATCH] Squashfs: reject negative file sizes in squashfs_read_inode()" failed to apply to 5.15-stable tree gregkh
2025-10-13 21:45 ` [PATCH 5.15.y 1/2] Squashfs: add additional inode sanity checking Sasha Levin
2025-10-13 21:45 ` [PATCH 5.15.y 2/2] Squashfs: reject negative file sizes in squashfs_read_inode() Sasha Levin
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