#include <stdio.h>
#include <signal.h>

#include "sig.h"

void register_signal(int signal, void (*handler)(int))
{
	sigset_t block_mask;
	struct sigaction saction;

	sigfillset(&block_mask);

	saction.sa_handler = handler;
	saction.sa_mask = block_mask;
	saction.sa_flags = SA_RESTART;

	sigaction(signal, &saction, NULL);
}

void register_signal_f(int signal, void (*handler)(int), int flags)
{
	sigset_t block_mask;
	struct sigaction saction;

	sigfillset(&block_mask);

	saction.sa_handler = handler;
	saction.sa_mask = block_mask;
	saction.sa_flags = flags;

	sigaction(signal, &saction, NULL);
}
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<tr><th>author</th><td>Miklos Szeredi &lt;mszeredi@redhat.com&gt;</td><td class='right'>2016-07-01 14:56:07 +0200</td></tr>
<tr><th>committer</th><td>J. Bruce Fields &lt;bfields@redhat.com&gt;</td><td class='right'>2016-07-01 10:24:18 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=6343a2120862f7023006c8091ad95c1f16a32077'>6343a2120862f7023006c8091ad95c1f16a32077</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=6343a2120862f7023006c8091ad95c1f16a32077'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=cb7d224f82e41d82518e7f9ea271d215d4d08e6e'>cb7d224f82e41d82518e7f9ea271d215d4d08e6e</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=6343a2120862f7023006c8091ad95c1f16a32077&amp;id2=cb7d224f82e41d82518e7f9ea271d215d4d08e6e'>diff</a>)</td></tr></table>
<div class='commit-subject'>locks: use file_inode()</div><div class='commit-msg'>(Another one for the f_path debacle.)

ltp fcntl33 testcase caused an Oops in selinux_file_send_sigiotask.

The reason is that generic_add_lease() used filp-&gt;f_path.dentry-&gt;inode
while all the others use file_inode().  This makes a difference for files
opened on overlayfs since the former will point to the overlay inode the
latter to the underlying inode.

So generic_add_lease() added the lease to the overlay inode and
generic_delete_lease() removed it from the underlying inode.  When the file
was released the lease remained on the overlay inode's lock list, resulting
in use after free.

Reported-by: Eryu Guan &lt;eguan@redhat.com&gt;
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Miklos Szeredi &lt;mszeredi@redhat.com&gt;
Reviewed-by: Jeff Layton &lt;jlayton@redhat.com&gt;
Signed-off-by: J. Bruce Fields &lt;bfields@redhat.com&gt;
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