/*
* Copyright 2015, Michael Neuling, IBM Corp.
* Licensed under GPLv2.
*
* Test the kernel's signal delievery code to ensure that we don't
* trelaim twice in the kernel signal delivery code. This can happen
* if we trigger a signal when in a transaction and the stack pointer
* is bogus.
*
* This test case registers a SEGV handler, sets the stack pointer
* (r1) to NULL, starts a transaction and then generates a SEGV. The
* SEGV should be handled but we exit here as the stack pointer is
* invalid and hance we can't sigreturn. We only need to check that
* this flow doesn't crash the kernel.
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include "utils.h"
#include "tm.h"
void signal_segv(int signum)
{
/* This should never actually run since stack is foobar */
exit(1);
}
int tm_signal_stack()
{
int pid;
SKIP_IF(!have_htm());
pid = fork();
if (pid < 0)
exit(1);
if (pid) { /* Parent */
/*
* It's likely the whole machine will crash here so if
* the child ever exits, we are good.
*/
wait(NULL);
return 0;
}
/*
* The flow here is:
* 1) register a signal handler (so signal delievery occurs)
* 2) make stack pointer (r1) = NULL
* 3) start transaction
* 4) cause segv
*/
if (signal(SIGSEGV, signal_segv) == SIG_ERR)
exit(1);
asm volatile("li 1, 0 ;" /* stack ptr == NULL */
"1:"
"tbegin.;"
"beq 1b ;" /* retry forever */
"tsuspend.;"
"ld 2, 0(1) ;" /* trigger segv" */
: : : "memory");
/* This should never get here due to above segv */
return 1;
}
int main(void)
{
return test_harness(tm_signal_stack, "tm_signal_stack");
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/infiniband?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>infiniband</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/infiniband/core?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>core</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'/><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>Linus Torvalds <torvalds@linux-foundation.org></td><td class='right'>2014-01-12 17:04:18 +0700</td></tr>
<tr><th>committer</th><td>Linus Torvalds <torvalds@linux-foundation.org></td><td class='right'>2014-01-12 17:04:18 +0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/infiniband/core?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>7e22e91102c6b9df7c4ae2168910e19d2bb14cd6</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/infiniband/core?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>a0b3677d442ed08ca16943fb471a90f5fd5bc367</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/infiniband/core?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>drivers/infiniband/core</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/infiniband/core?id=3dc91d4338d698ce77832985f9cb183d8eeaf6be'>3dc91d4338d698ce77832985f9cb183d8eeaf6be</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/infiniband/core?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6&id2=3dc91d4338d698ce77832985f9cb183d8eeaf6be'>diff</a>)</td></tr></table>
<div class='commit-subject'>Linux 3.13-rc8</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=7e22e91102c6b9df7c4ae2168910e19d2bb14cd6'>Diffstat</a> (limited to 'drivers/infiniband/core')</div><table summary='diffstat' class='diffstat'>