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Subject[PATCH 3/3] ima: use fs method to read integrity data
Date
From: Christoph Hellwig <hch@lst.de>

Add a new ->integrity_read file operation to read data for integrity
hash collection. This is defined to be equivalent to ->read_iter,
except that it will be called with the i_rwsem held exclusively.

(Based on Christoph's original patch.)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Jan Kara <jack@suse.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Chao Yu <yuchao0@huawei.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Bob Peterson <rpeterso@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dave Kleikamp <shaggy@kernel.org>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Chris Mason <clm@fb.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
---
fs/btrfs/file.c | 1 +
fs/efivarfs/file.c | 1 +
fs/ext2/file.c | 17 +++++++++++++++++
fs/ext4/file.c | 20 ++++++++++++++++++++
fs/f2fs/file.c | 1 +
fs/jffs2/file.c | 1 +
fs/jfs/file.c | 1 +
fs/nilfs2/file.c | 1 +
fs/ramfs/file-mmu.c | 1 +
fs/ramfs/file-nommu.c | 1 +
fs/ubifs/file.c | 1 +
fs/xfs/xfs_file.c | 21 +++++++++++++++++++++
include/linux/fs.h | 1 +
mm/shmem.c | 1 +
security/integrity/iint.c | 20 ++++++++++++++------
15 files changed, 83 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 9e75d8a39aac..2542dc66c85c 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -3125,6 +3125,7 @@ const struct file_operations btrfs_file_operations = {
#endif
.clone_file_range = btrfs_clone_file_range,
.dedupe_file_range = btrfs_dedupe_file_range,
+ .integrity_read = generic_file_read_iter,
};

void btrfs_auto_defrag_exit(void)
diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c
index 863f1b100165..17955a92a5b3 100644
--- a/fs/efivarfs/file.c
+++ b/fs/efivarfs/file.c
@@ -179,4 +179,5 @@ const struct file_operations efivarfs_file_operations = {
.write = efivarfs_file_write,
.llseek = no_llseek,
.unlocked_ioctl = efivarfs_file_ioctl,
+ .integrity_read = efivarfs_file_read_iter,
};
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index d34d32bdc944..111069de1973 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -192,6 +192,22 @@ static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
return generic_file_read_iter(iocb, to);
}

+static ssize_t ext2_file_integrity_read_iter(struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+
+ lockdep_assert_held(&inode->i_rwsem);
+#ifdef CONFIG_FS_DAX
+ if (!iov_iter_count(to))
+ return 0; /* skip atime */
+
+ if (IS_DAX(iocb->ki_filp->f_mapping->host))
+ return dax_iomap_rw(iocb, to, &ext2_iomap_ops);
+#endif
+ return generic_file_read_iter(iocb, to);
+}
+
static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
#ifdef CONFIG_FS_DAX
@@ -216,6 +232,7 @@ const struct file_operations ext2_file_operations = {
.get_unmapped_area = thp_get_unmapped_area,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
+ .integrity_read = ext2_file_integrity_read_iter,
};

const struct inode_operations ext2_file_inode_operations = {
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 58294c9a7e1d..3ab4105c8578 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -74,6 +74,25 @@ static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
return generic_file_read_iter(iocb, to);
}

+static ssize_t ext4_file_integrity_read_iter(struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+
+ lockdep_assert_held(&inode->i_rwsem);
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
+ if (!iov_iter_count(to))
+ return 0; /* skip atime */
+
+#ifdef CONFIG_FS_DAX
+ if (IS_DAX(inode))
+ return dax_iomap_rw(iocb, to, &ext4_iomap_ops);
+#endif
+ return generic_file_read_iter(iocb, to);
+}
+
/*
* Called when an inode is released. Note that this is different
* from ext4_file_open: open gets called at every open, but release
@@ -747,6 +766,7 @@ const struct file_operations ext4_file_operations = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = ext4_fallocate,
+ .integrity_read = ext4_file_integrity_read_iter,
};

const struct inode_operations ext4_file_inode_operations = {
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 2706130c261b..82ea81da0b2d 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2514,4 +2514,5 @@ const struct file_operations f2fs_file_operations = {
#endif
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
+ .integrity_read = generic_file_read_iter,
};
diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index c12476e309c6..5a63034cccf5 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -57,6 +57,7 @@ const struct file_operations jffs2_file_operations =
.mmap = generic_file_readonly_mmap,
.fsync = jffs2_fsync,
.splice_read = generic_file_splice_read,
+ .integrity_read = generic_file_read_iter,
};

/* jffs2_file_inode_operations */
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index 739492c7a3fd..423512a810e4 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -162,4 +162,5 @@ const struct file_operations jfs_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = jfs_compat_ioctl,
#endif
+ .integrity_read = generic_file_read_iter,
};
diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index c5fa3dee72fc..55e058ac487f 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -150,6 +150,7 @@ const struct file_operations nilfs_file_operations = {
/* .release = nilfs_release_file, */
.fsync = nilfs_sync_file,
.splice_read = generic_file_splice_read,
+ .integrity_read = generic_file_read_iter,
};

const struct inode_operations nilfs_file_inode_operations = {
diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 12af0490322f..4f24d1b589b1 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -47,6 +47,7 @@ const struct file_operations ramfs_file_operations = {
.splice_write = iter_file_splice_write,
.llseek = generic_file_llseek,
.get_unmapped_area = ramfs_mmu_get_unmapped_area,
+ .integrity_read = generic_file_read_iter,
};

const struct inode_operations ramfs_file_inode_operations = {
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 2ef7ce75c062..5ee704fa84e0 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -50,6 +50,7 @@ const struct file_operations ramfs_file_operations = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.llseek = generic_file_llseek,
+ .integrity_read = generic_file_read_iter,
};

const struct inode_operations ramfs_file_inode_operations = {
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 8cad0b19b404..5e52a315e18b 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1747,4 +1747,5 @@ const struct file_operations ubifs_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ubifs_compat_ioctl,
#endif
+ .integrity_read = generic_file_read_iter,
};
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index c4893e226fd8..0a6704b563d6 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -292,6 +292,26 @@ xfs_file_read_iter(
return ret;
}

+static ssize_t
+xfs_integrity_read(
+ struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct xfs_mount *mp = XFS_I(inode)->i_mount;
+
+ lockdep_assert_held(&inode->i_rwsem);
+
+ XFS_STATS_INC(mp, xs_read_calls);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ if (IS_DAX(inode))
+ return dax_iomap_rw(iocb, to, &xfs_iomap_ops);
+ return generic_file_read_iter(iocb, to);
+}
+
/*
* Zero any on disk space between the current EOF and the new, larger EOF.
*
@@ -1175,6 +1195,7 @@ const struct file_operations xfs_file_operations = {
.fallocate = xfs_file_fallocate,
.clone_file_range = xfs_file_clone_range,
.dedupe_file_range = xfs_file_dedupe_range,
+ .integrity_read = xfs_integrity_read,
};

const struct file_operations xfs_dir_file_operations = {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e522d25d0836..f6a01d3efce5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1699,6 +1699,7 @@ struct file_operations {
u64);
ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *,
u64);
+ ssize_t (*integrity_read)(struct kiocb *, struct iov_iter *);
} __randomize_layout;

struct inode_operations {
diff --git a/mm/shmem.c b/mm/shmem.c
index b0aa6075d164..805d99011ca4 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3849,6 +3849,7 @@ static const struct file_operations shmem_file_operations = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = shmem_fallocate,
+ .integrity_read = shmem_file_read_iter,
#endif
};

diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index c84e05866052..c3a07276f745 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -21,6 +21,7 @@
#include <linux/rbtree.h>
#include <linux/file.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include "integrity.h"

static struct rb_root integrity_iint_tree = RB_ROOT;
@@ -184,18 +185,25 @@ security_initcall(integrity_iintcache_init);
int integrity_kernel_read(struct file *file, loff_t offset,
void *addr, unsigned long count)
{
- mm_segment_t old_fs;
- char __user *buf = (char __user *)addr;
+ struct inode *inode = file_inode(file);
+ struct kvec iov = { .iov_base = addr, .iov_len = count };
+ struct kiocb kiocb;
+ struct iov_iter iter;
ssize_t ret;

+ lockdep_assert_held(&inode->i_rwsem);
+
if (!(file->f_mode & FMODE_READ))
return -EBADF;
+ if (!file->f_op->integrity_read)
+ return -EBADF;

- old_fs = get_fs();
- set_fs(get_ds());
- ret = __vfs_read(file, buf, count, &offset);
- set_fs(old_fs);
+ init_sync_kiocb(&kiocb, file);
+ kiocb.ki_pos = offset;
+ iov_iter_kvec(&iter, READ | ITER_KVEC, &iov, 1, count);

+ ret = file->f_op->integrity_read(&kiocb, &iter);
+ BUG_ON(ret == -EIOCBQUEUED);
return ret;
}

--
2.7.4
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