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authorAmir Goldstein <amir73il@gmail.com>2023-07-16 14:47:14 +0300
committerChristian Brauner <brauner@kernel.org>2023-11-24 12:37:44 +0300
commitb8e1425bae856b189e2365ff795e30fdd9e77049 (patch)
tree3f055c84560b8c44d460595993bd5b875c88d92b /fs/read_write.c
parent1c8aa833034a00617866ea4738a40491e3e23902 (diff)
downloadlinux-b8e1425bae856b189e2365ff795e30fdd9e77049.tar.xz
fs: move permission hook out of do_iter_read()
We recently moved fsnotify hook, rw_verify_area() and other checks from do_iter_write() out to its two callers. for consistency, do the same thing for do_iter_read() - move the rw_verify_area() checks and fsnotify hook to the callers vfs_iter_read() and vfs_readv(). This aligns those vfs helpers with the pattern used in vfs_read() and vfs_iocb_iter_read() and the vfs write helpers, where all the checks are in the vfs helpers and the do_* or call_* helpers do the work. This is needed for fanotify "pre content" events. Suggested-by: Jan Kara <jack@suse.cz> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Link: https://lore.kernel.org/r/20231122122715.2561213-13-amir73il@gmail.com Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c66
1 files changed, 39 insertions, 27 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index d08d0a3ff7de..9fce8d6968df 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -773,12 +773,14 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
return ret;
}
-static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
- loff_t *pos, rwf_t flags)
+ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb,
+ struct iov_iter *iter)
{
size_t tot_len;
ssize_t ret = 0;
+ if (!file->f_op->read_iter)
+ return -EINVAL;
if (!(file->f_mode & FMODE_READ))
return -EBADF;
if (!(file->f_mode & FMODE_CAN_READ))
@@ -787,22 +789,20 @@ static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
tot_len = iov_iter_count(iter);
if (!tot_len)
goto out;
- ret = rw_verify_area(READ, file, pos, tot_len);
+ ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len);
if (ret < 0)
return ret;
- if (file->f_op->read_iter)
- ret = do_iter_readv_writev(file, iter, pos, READ, flags);
- else
- ret = do_loop_readv_writev(file, iter, pos, READ, flags);
+ ret = call_read_iter(file, iocb, iter);
out:
if (ret >= 0)
fsnotify_access(file);
return ret;
}
+EXPORT_SYMBOL(vfs_iocb_iter_read);
-ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb,
- struct iov_iter *iter)
+ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
+ rwf_t flags)
{
size_t tot_len;
ssize_t ret = 0;
@@ -817,25 +817,16 @@ ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb,
tot_len = iov_iter_count(iter);
if (!tot_len)
goto out;
- ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len);
+ ret = rw_verify_area(READ, file, ppos, tot_len);
if (ret < 0)
return ret;
- ret = call_read_iter(file, iocb, iter);
+ ret = do_iter_readv_writev(file, iter, ppos, READ, flags);
out:
if (ret >= 0)
fsnotify_access(file);
return ret;
}
-EXPORT_SYMBOL(vfs_iocb_iter_read);
-
-ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
- rwf_t flags)
-{
- if (!file->f_op->read_iter)
- return -EINVAL;
- return do_iter_read(file, iter, ppos, flags);
-}
EXPORT_SYMBOL(vfs_iter_read);
ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb,
@@ -898,19 +889,40 @@ ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
EXPORT_SYMBOL(vfs_iter_write);
static ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
- unsigned long vlen, loff_t *pos, rwf_t flags)
+ unsigned long vlen, loff_t *pos, rwf_t flags)
{
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
struct iov_iter iter;
- ssize_t ret;
+ size_t tot_len;
+ ssize_t ret = 0;
- ret = import_iovec(ITER_DEST, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
- if (ret >= 0) {
- ret = do_iter_read(file, &iter, pos, flags);
- kfree(iov);
- }
+ if (!(file->f_mode & FMODE_READ))
+ return -EBADF;
+ if (!(file->f_mode & FMODE_CAN_READ))
+ return -EINVAL;
+
+ ret = import_iovec(ITER_DEST, vec, vlen, ARRAY_SIZE(iovstack), &iov,
+ &iter);
+ if (ret < 0)
+ return ret;
+
+ tot_len = iov_iter_count(&iter);
+ if (!tot_len)
+ goto out;
+
+ ret = rw_verify_area(READ, file, pos, tot_len);
+ if (ret < 0)
+ goto out;
+ if (file->f_op->read_iter)
+ ret = do_iter_readv_writev(file, &iter, pos, READ, flags);
+ else
+ ret = do_loop_readv_writev(file, &iter, pos, READ, flags);
+out:
+ if (ret >= 0)
+ fsnotify_access(file);
+ kfree(iov);
return ret;
}