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xfs: xfs_ioctl: fix information leak to userland
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 <segooon@gmail.com> Signed-off-by: Alex Elder <aelder@sgi.com>
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@ -416,7 +416,7 @@ xfs_attrlist_by_handle(
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
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kbuf = kzalloc(al_hreq.buflen, GFP_KERNEL);
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if (!kbuf)
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goto out_dput;
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