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authorTheodore Ts'o <tytso@mit.edu>2018-12-19 20:29:13 +0300
committerTheodore Ts'o <tytso@mit.edu>2018-12-19 20:29:13 +0300
commit8a363970d1dc38c4ec4ad575c862f776f468d057 (patch)
tree4c2f7788f568c974552b1b1a158a0423dbe84f04 /fs/ext4/ioctl.c
parenta805622a757b6d7f65def4141d29317d8e37b8a1 (diff)
downloadlinux-8a363970d1dc38c4ec4ad575c862f776f468d057.tar.xz
ext4: avoid declaring fs inconsistent due to invalid file handles
If we receive a file handle, either from NFS or open_by_handle_at(2), and it points at an inode which has not been initialized, and the file system has metadata checksums enabled, we shouldn't try to get the inode, discover the checksum is invalid, and then declare the file system as being inconsistent. This can be reproduced by creating a test file system via "mke2fs -t ext4 -O metadata_csum /tmp/foo.img 8M", mounting it, cd'ing into that directory, and then running the following program. #define _GNU_SOURCE #include <fcntl.h> struct handle { struct file_handle fh; unsigned char fid[MAX_HANDLE_SZ]; }; int main(int argc, char **argv) { struct handle h = {{8, 1 }, { 12, }}; open_by_handle_at(AT_FDCWD, &h.fh, O_RDONLY); return 0; } Google-Bug-Id: 120690101 Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/ioctl.c')
-rw-r--r--fs/ext4/ioctl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 0edee31913d1..d37dafa1d133 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -125,7 +125,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
return -EPERM;
- inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
+ inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
if (IS_ERR(inode_bl))
return PTR_ERR(inode_bl);
ei_bl = EXT4_I(inode_bl);