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xfs: xfs_ioctl: fix information leak to userland

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al_hreq is copied from userland.  If al_hreq.buflen is not properly aligned
then xfs_attr_list will ignore the last bytes of kbuf.  These bytes are
unitialized.  It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <[email protected]>
Signed-off-by: Alex Elder <[email protected]>
This commit is contained in:
Kulikov Vasiliy 2010-10-30 14:26:17 +00:00 • committed by Alex Elder
commit 6762b938ea
1 changed files with 1 additions and 1 deletions
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fs/xfs/linux-2.6/xfs_ioctl.c
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@ -416,7 +416,7 @@ xfs_attrlist_by_handle(
if (IS_ERR(dentry))
return PTR_ERR(dentry);
kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
kbuf = kzalloc(al_hreq.buflen, GFP_KERNEL);
if (!kbuf)
goto out_dput;