mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
25007a69e8
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. Signed-off-by: Michael Neuling <mikey@neuling.org> Tested-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> [mpe: Skip if we don't have TM] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/*
|
|
* 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.regs->gpr[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");
|
|
}
|