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authorAmir Goldstein <amir73il@gmail.com>2019-06-05 08:04:49 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-06-09 10:06:19 -0700
commit96e6e8f4a68df2d94800311163faa67124df24e5 (patch)
tree42b63675c58ce53f9896daf674937625e71a684d /fs/read_write.c
parentvfs: remove redundant checks from generic_remap_checks() (diff)
downloadlinux-dev-96e6e8f4a68df2d94800311163faa67124df24e5.tar.xz
linux-dev-96e6e8f4a68df2d94800311163faa67124df24e5.zip
vfs: add missing checks to copy_file_range
Like the clone and dedupe interfaces we've recently fixed, the copy_file_range() implementation is missing basic sanity, limits and boundary condition tests on the parameters that are passed to it from userspace. Create a new "generic_copy_file_checks()" function modelled on the generic_remap_checks() function to provide this missing functionality. [Amir] Shorten copy length instead of checking pos_in limits because input file size already abides by the limits. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index f1900bdb3127..b0fb1176b628 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1626,7 +1626,8 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
return -EXDEV;
- ret = generic_file_rw_checks(file_in, file_out);
+ ret = generic_copy_file_checks(file_in, pos_in, file_out, pos_out, &len,
+ flags);
if (unlikely(ret))
return ret;