/*
 * Copyright 2015, Michael Neuling, IBM Corp.
 * Licensed under GPLv2.
 *
 * Test the kernel's signal return code to ensure that it doesn't
 * crash when both the transactional and suspend MSR bits are set in
 * the signal context.
 *
 * For this test, we send ourselves a SIGUSR1.  In the SIGUSR1 handler
 * we modify the signal context to set both MSR TM S and T bits (which
 * is "reserved" by the PowerISA). When we return from the signal
 * handler (implicit sigreturn), the kernel should detect reserved MSR
 * value and send us with a SIGSEGV.
 */

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

#include "utils.h"
#include "tm.h"

int segv_expected = 0;

void signal_segv(int signum)
{
	if (segv_expected && (signum == SIGSEGV))
		_exit(0);
	_exit(1);
}

void signal_usr1(int signum, siginfo_t *info, void *uc)
{
	ucontext_t *ucp = uc;

	/* Link tm checkpointed context to normal context */
	ucp->uc_link = ucp;
	/* Set all TM bits so that the context is now invalid */
#ifdef __powerpc64__
	ucp->uc_mcontext.gp_regs[PT_MSR] |= (7ULL << 32);
#else
	ucp->uc_mcontext.uc_regs->gregs[PT_MSR] |= (7ULL);
#endif
	/* Should segv on return becuase of invalid context */
	segv_expected = 1;
}

int tm_signal_msr_resv()
{
	struct sigaction act;

	SKIP_IF(!have_htm());

	act.sa_sigaction = signal_usr1;
	sigemptyset(&act.sa_mask);
	act.sa_flags = SA_SIGINFO;
	if (sigaction(SIGUSR1, &act, NULL) < 0) {
		perror("sigaction sigusr1");
		exit(1);
	}
	if (signal(SIGSEGV, signal_segv) == SIG_ERR)
		exit(1);

	raise(SIGUSR1);

	/* We shouldn't get here as we exit in the segv handler */
	return 1;
}

int main(void)
{
	return test_harness(tm_signal_msr_resv, "tm_signal_msr_resv");
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=54791b276b4000b307339f269d3bf7db877d536f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=54791b276b4000b307339f269d3bf7db877d536f'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?id=54791b276b4000b307339f269d3bf7db877d536f'>mac80211</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/rc80211_minstrel.c?id=54791b276b4000b307339f269d3bf7db877d536f'>rc80211_minstrel.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='54791b276b4000b307339f269d3bf7db877d536f'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 14:28:22 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 14:28:22 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/rc80211_minstrel.c?id=54791b276b4000b307339f269d3bf7db877d536f'>54791b276b4000b307339f269d3bf7db877d536f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/mac80211/rc80211_minstrel.c?id=54791b276b4000b307339f269d3bf7db877d536f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=54791b276b4000b307339f269d3bf7db877d536f'>1c2616bd373ce5ea28aac2a53e32f5b5834901ce</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/mac80211/rc80211_minstrel.c?id=54791b276b4000b307339f269d3bf7db877d536f'>net/mac80211/rc80211_minstrel.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/rc80211_minstrel.c?id=5d0e7705774dd412a465896d08d59a81a345c1e4'>5d0e7705774dd412a465896d08d59a81a345c1e4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/mac80211/rc80211_minstrel.c?id=54791b276b4000b307339f269d3bf7db877d536f&amp;id2=5d0e7705774dd412a465896d08d59a81a345c1e4'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/rc80211_minstrel.c?id=047487241ff59374fded8c477f21453681f5995c'>047487241ff59374fded8c477f21453681f5995c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/mac80211/rc80211_minstrel.c?id=54791b276b4000b307339f269d3bf7db877d536f&amp;id2=047487241ff59374fded8c477f21453681f5995c'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'sparc64-non-resumable-user-error-recovery'</div><div class='commit-msg'>Liam R. Howlett says:

====================
sparc64: Recover from userspace non-resumable PIO &amp; MEM errors

A non-resumable error from userspace is able to cause a kernel panic or trap
loop due to the setup and handling of the queued traps once in the kernel.
This patch series addresses both of these issues.

The queues are fixed by simply zeroing the memory before use.

PIO errors from userspace will result in a SIGBUS being sent to the user
process.

The MEM errors form userspace will result in a SIGKILL and also cause the
offending pages to be claimed so they are no longer used in future tasks.
SIGKILL is used to ensure that the process does not try to coredump and result
in an attempt to read the memory again from within kernel space.  Although
there is a HV call to scrub the memory (mem_scrub), there is no easy way to
guarantee that the real memory address(es) are not used by other tasks.
Clearing the error with mem_scrub would zero the memory and cause the other
processes to proceed with bad data.

The handling of other non-resumable errors remain unchanged and will cause a
panic.
====================

Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=54791b276b4000b307339f269d3bf7db877d536f'>Diffstat</a> (limited to 'net/mac80211/rc80211_minstrel.c')</div><table summary='diffstat' class='diffstat'>