From: Jann Horn <jannh@xxxxxxxxxx>
commit 4f5a100f87f32cb65d4bb1ad282a08c92f6f591e upstream.
The F2FS ioctls for starting and committing atomic writes check for
inode_owner_or_capable(), but this does not give LSMs like SELinux or
Landlock an opportunity to deny the write access - if the caller's FSUID
matches the inode's UID, inode_owner_or_capable() immediately returns true.
There are scenarios where LSMs want to deny a process the ability to write
particular files, even files that the FSUID of the process owns; but this
can currently partially be bypassed using atomic write ioctls in two ways:
- F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can
truncate an inode to size 0
- F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert
changes another process concurrently made to a file
Fix it by requiring FMODE_WRITE for these operations, just like for
F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these
ioctls when intending to write into the file, that seems unlikely to break
anything.
Fixes: 88b88a667971 ("f2fs: support atomic writes")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/f2fs/file.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index be9536815e50d..fd369db1e47b5 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2005,10 +2005,13 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
struct inode *inode = file_inode(filp);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
int ret;
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
return -EINVAL;
@@ -2075,10 +2078,13 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
static int f2fs_ioc_commit_atomic_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
int ret;
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
if (ret)
@@ -2117,10 +2123,13 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
static int f2fs_ioc_start_volatile_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
int ret;
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
return -EINVAL;
@@ -2152,10 +2161,13 @@ static int f2fs_ioc_start_volatile_write(struct file *filp)
static int f2fs_ioc_release_volatile_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
int ret;
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
if (ret)
@@ -2181,10 +2193,13 @@ static int f2fs_ioc_release_volatile_write(struct file *filp)
static int f2fs_ioc_abort_volatile_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
int ret;
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
if (ret)
base-commit: 3a5928702e7120f83f703fd566082bfb59f1a57e
--
2.47.0.rc0.187.ge670bccf7e-goog
