Messages in this thread |  | | Date | Wed, 10 Jan 2001 19:02:08 +0300 | From | "Vladimir V. Saveliev" <> | Subject | Re: [reiserfs-list] major security bug in reiserfs (may affect SuSE Linux) |
| |
Hi
Chris Mason wrote:
> On Wednesday, January 10, 2001 02:32:09 AM +0100 Marc Lehmann <pcg@goof.com> wrote: > > >>> EIP; c013f911 <filldir+20b/221> <===== > > Trace; c013f706 <filldir+0/221> > > Trace; c0136e01 <reiserfs_getblk+2a/16d> > > The buffer reiserfs is sending to filldir is big enough for > the huge file name, so I think the real fix should be done in VFSland. > > But, in the interest of providing a quick, obviously correct fix, this > reiserfs only patch will refuse to create file names larger > than 255 chars, and skip over any directory entries larger than > 255 chars. >
Hmm, wouldn't it make existing long named files unreachable?
Thanks, vs
> > --- linux/include/linux/reiserfs_fs.h.1 Tue Jan 9 21:56:18 2001 > +++ linux/include/linux/reiserfs_fs.h Tue Jan 9 21:56:33 2001 > @@ -467,7 +467,7 @@ > /* name by bh, ih and entry_num */ > #define B_I_E_NAME(entry_num,bh,ih) ((char *)(bh->b_data + ih->ih_item_location + (B_I_DEH(bh,ih)+(entry_num))->deh_location)) > > -#define REISERFS_MAX_NAME_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE - DEH_SIZE) /* -SD_SIZE when entry will contain stat data */ > +#define REISERFS_MAX_NAME_LEN(block_size) 255 > > /* this structure is used for operations on directory entries. It is not a disk structure. */ > /* When reiserfs_find_entry or search_by_entry_key find directory entry, they return filled reiserfs_dir_entry structure */ > --- linux/fs/reiserfs/dir.c.1 Tue Jan 9 22:06:06 2001 > +++ linux/fs/reiserfs/dir.c Tue Jan 9 22:15:17 2001 > @@ -159,6 +159,10 @@ > d_name = B_I_DEH_ENTRY_FILE_NAME (bh, ih, deh); > d_off = deh->deh_offset; > d_ino = deh->deh_objectid; > + if (d_reclen > REISERFS_MAX_NAME_LEN(inode->i_sb->s_blocksize)){ > + /* it is too big to send back to VFS */ > + continue ; > + } > if (d_reclen <= 32) { > local_buf = small_buf ; > } else {
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