This off-by-one bug causes sendfile() to not work properly. When a task
calls sendfile() on a file on a CIFS filesystem, the syscall returns -1
and sets errno to EOVERFLOW.
do_sendfile uses s_maxbytes to verify the returned offset of the file.
The problem there is that this value is cast to a signed value (loff_t).
When this is done on the s_maxbytes value that cifs uses, it becomes
negative and the comparisons against it fail.
Even though s_maxbytes is an unsigned value, it seems that it's not OK
to set it in such a way that it'll end up negative when it's cast to a
signed value. These casts happen in other codepaths besides sendfile
too, but the VFS is a little hard to follow in this area and I can't
be sure if there are other bugs that this will fix.
It's not clear to me why s_maxbytes isn't just declared as loff_t in the
first place, but either way we still need to fix these values to make
sendfile work properly. This is also an opportunity to replace the magic
bit-shift values here with the standard #defines for this.
This fixes the reproducer program I have that does a sendfile and
will probably also fix the situation where apache is serving from a
CIFS share.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/cifs/connect.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 3e9936d..82ad2a8 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2446,10 +2446,10 @@ try_mount_again:
tcon->local_lease = volume_info->local_lease;
}
if (pSesInfo) {
- if (pSesInfo->capabilities & CAP_LARGE_FILES) {
- sb->s_maxbytes = (u64) 1 << 63;
- } else
- sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
+ if (pSesInfo->capabilities & CAP_LARGE_FILES)
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ else
+ sb->s_maxbytes = MAX_NON_LFS;
}
/* BB FIXME fix time_gran to be larger for LANMAN sessions */
--
1.6.0.6
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