Re: [LTP] [PATCH] syscalls: fix some failure on arch X86_64

Rishikesh K Rajak
2010-02-22T14:46:28Z

On Mon, Feb 22, 2010 at 05:20:33PM +0800, liubo wrote:

Hi Liu,

> - rt_sigaction01
> On arch x86_64, if we directly get to call syscall
> rt_sigaction, there will be "segment fault".
> 1) One reason is that we must supply the flag of
> "SA_RESTORER" and the correct pointer to the fuction
> "restorer", according to the kernel code.
> 2) The other reason is that default syscall rt_sigaction
> use kernel "sigaction" structure, which is different
> with normal "sigaction" structure.
>
> So,
> 1) We manage to find the address of the function
> "restorer" by using glibc function "sigaction",
> which might be something tricky. Then we add these
> arguments to make test run correctly.
> 2) We also use kernel "sigaction" structure to fit
> realtime syscall __NR_rt_sigaction.
>
> - rt_sigprocmask01
> First, there exsits the same problem as rt_sigaction01.
> Second, this testcase uses a unchanged signal number 33,
> which may diff among different archs and lead to error
> "unknown signal".
>
> So, we use a macro TEST_SIG which refers to SIGRTMIN+1
> to replace 33.
>
> - rt_sigsuspend01
> There exists the same problem as rt_sigaction01.
>
> This patch fixed these failure.
>
> Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>

Acked/Tested-By: Rishikesh K Rajak<risrajak@linux.vnet.ibm.com>

Before patch:
rt_sigaction01 FAIL 11
rt_sigprocmask01 FAIL 11
rt_sigsuspend01 FAIL 11

After patch:

mhs21a:/opt/ltp/testcases/bin # ./rt_sigprocmask01
rt_sigprocmask01 1 TPASS : rt_sigprocmask() PASSED
mhs21a:/opt/ltp/testcases/bin # ./rt_sigsuspend01
rt_sigsuspend01 1 TPASS : rt_sigsuspend PASSED
rt_sigsuspend01 2 TPASS : rt_sigsuspend PASSED
rt_sigsuspend01 3 TPASS : rt_sigsuspend PASSED
rt_sigsuspend01 4 TPASS : rt_sigsuspend PASSED
mhs21a:/opt/ltp/testcases/bin # ./rt_sigprocmask01
rt_sigprocmask01 1 TPASS : rt_sigprocmask() PASSED
mhs21a:/opt/ltp/testcases/bin #

Thanks
-Rishi
>
> ---
> include/rt_signal.h | 60 +++++++++++++++++
> .../kernel/syscalls/rt_sigaction/rt_sigaction01.c | 69 ++++++++++++--------
> .../syscalls/rt_sigprocmask/rt_sigprocmask01.c | 32 +++++++---
> .../syscalls/rt_sigsuspend/rt_sigsuspend01.c | 13 ++++-
> 4 files changed, 136 insertions(+), 38 deletions(-)
> create mode 100644 include/rt_signal.h
>
> diff --git a/include/rt_signal.h b/include/rt_signal.h
> new file mode 100644
> index 0000000..ea1e7e3
> --- /dev/null
> +++ b/include/rt_signal.h
> @@ -0,0 +1,60 @@
> +/******************************************************************************/
> +/* */
> +/* Copyright (c) 2009 FUJITSU LIMITED */
> +/* */
> +/* This program is free software; you can redistribute it and/or modify */
> +/* it under the terms of the GNU General Public License as published by */
> +/* the Free Software Foundation; either version 2 of the License, or */
> +/* (at your option) any later version. */
> +/* */
> +/* This program is distributed in the hope that it will be useful, */
> +/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
> +/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
> +/* the GNU General Public License for more details. */
> +/* */
> +/* You should have received a copy of the GNU General Public License */
> +/* along with this program; if not, write to the Free Software */
> +/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
> +/* */
> +/* Author: Liu Bo <liubo2009@cn.fujitsu.com> */
> +/* */
> +/******************************************************************************/
> +
> +#ifndef __LTP_SIGNAL_H
> +#define __LTP_SIGNAL_H
> +
> +/* We do not globally define the SA_RESTORER flag so do it here. */
> +#define HAVE_SA_RESTORER
> +#define SA_RESTORER 0x04000000
> +
> +struct kernel_sigaction {
> + __sighandler_t k_sa_handler;
> + unsigned long sa_flags;
> + void (*sa_restorer) (void);
> + sigset_t sa_mask;
> +};
> +
> +void (*restore_rt) (void);
> +
> +void
> +handler_h(void)
> +{
> + return;
> +}
> +
> +/* initial restore_rt for x86_64 */
> +void
> +sig_initial(int sig)
> +{
> + struct sigaction act, oact;
> +
> + act.sa_handler = (void *)handler_h;
> + sigemptyset(&act.sa_mask);
> + sigaddset(&act.sa_mask, sig);
> + /* copy act.sa_restorer to kernel */
> + sigaction(sig, &act, &oact);
> + /* copy oact.sa_restorer from kernel */
> + sigaction(sig, &act, &oact);
> + restore_rt = oact.sa_restorer;
> +}
> +#endif
> diff --git a/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01.c b/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01.c
> index ffc5fa2..c8f5d5f 100644
> --- a/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01.c
> +++ b/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01.c
> @@ -55,6 +55,10 @@
> #include "usctest.h"
> #include "linux_syscall_numbers.h"
>
> +#ifdef __x86_64__
> +#include "rt_signal.h"
> +#endif
> +
> /*
> * For all but __mips__:
> *
> @@ -101,13 +105,14 @@ int TST_TOTAL = 1; /* total number of tests in this file. *
> /* On success - Exits calling tst_exit(). With '0' return code. */
> /* */
> /******************************************************************************/
> -extern void cleanup() {
> - /* Remove tmp dir and all files in it */
> - TEST_CLEANUP;
> - tst_rmdir();
> +extern void cleanup()
> +{
> + /* Remove tmp dir and all files in it */
> + TEST_CLEANUP;
> + tst_rmdir();
>
> - /* Exit with appropriate return code. */
> - tst_exit();
> + /* Exit with appropriate return code. */
> + tst_exit();
> }
>
> /* Local Functions */
> @@ -128,11 +133,12 @@ extern void cleanup() {
> /* On success - returns 0. */
> /* */
> /******************************************************************************/
> -void setup() {
> - /* Capture signals if any */
> - /* Create temporary directories */
> - TEST_PAUSE;
> - tst_tmpdir();
> +void setup()
> +{
> + /* Capture signals if any */
> + /* Create temporary directories */
> + TEST_PAUSE;
> + tst_tmpdir();
> }
>
> int test_flags[] = {SA_RESETHAND|SA_SIGINFO, SA_RESETHAND, SA_RESETHAND|SA_SIGINFO, SA_RESETHAND|SA_SIGINFO, SA_NOMASK};
> @@ -144,22 +150,23 @@ handler(int sig)
> tst_resm(TINFO,"Signal Handler Called with signal number %d\n",sig);
> return;
> }
> -
> int
> -set_handler(int sig, int sig_to_mask, int mask_flags)
> +set_handler(int sig, int mask_flags)
> {
> - struct sigaction sa, oldaction;
> -
> - sa.sa_sigaction = (void *)handler;
> - sa.sa_flags = mask_flags;
> - sigemptyset(&sa.sa_mask);
> - sigaddset(&sa.sa_mask, sig_to_mask);
> - TEST(syscall(__NR_rt_sigaction,sig, &sa, &oldaction,SIGSETSIZE));
> - if (TEST_RETURN == 0) {
> - return 0;
> - } else {
> - return TEST_RETURN;
> - }
> +#ifdef __x86_64__
> + struct kernel_sigaction sa, oldaction;
> + mask_flags |= SA_RESTORER;
> + sa.sa_restorer = restore_rt;
> + sa.k_sa_handler = (void *)handler;
> +#else
> + struct sigaction sa, oldaction;
> + sa.sa_handler = (void *)handler;
> +#endif
> + sa.sa_flags = mask_flags;
> + sigemptyset(&sa.sa_mask);
> + sigaddset(&sa.sa_mask, sig);
> + TEST(syscall(__NR_rt_sigaction,sig, &sa, &oldaction,SIGSETSIZE));
> + return TEST_RETURN;
> }
>
>
> @@ -167,6 +174,7 @@ int main(int ac, char **av) {
> int signal, flag;
> int lc; /* loop counter */
> char *msg; /* message returned from parse_opts */
> + int fc; /* flag counter */
>
> /* parse standard options */
> if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
> @@ -179,11 +187,16 @@ int main(int ac, char **av) {
> /* Check looping state if -i option given */
> for (lc = 0; TEST_LOOPING(lc); ++lc) {
> Tst_count = 0;
> - for (testno = 0; testno < TST_TOTAL; ++testno) {
> + fc = sizeof (test_flags) / sizeof (test_flags[0]);
> +
> + for (testno = 0; testno < TST_TOTAL; ++testno) {
>
> for (signal = SIGRTMIN; signal <= (SIGRTMAX ); signal++){//signal for 34 to 65
> - for(flag=0; flag<5;flag++) {
> - TEST(set_handler(signal, 0, test_flags[flag]));
> +#ifdef __x86_64__
> + sig_initial(signal);
> +#endif
> + for(flag=0; flag<fc;flag++) {
> + TEST(set_handler(signal, test_flags[flag]));
> if (TEST_RETURN == 0) {
> tst_resm(TINFO,"signal: %d ", signal);
> tst_resm(TPASS, "rt_sigaction call succeeded: result = %ld ",TEST_RETURN );
> diff --git a/testcases/kernel/syscalls/rt_sigprocmask/rt_sigprocmask01.c b/testcases/kernel/syscalls/rt_sigprocmask/rt_sigprocmask01.c
> index 6398a28..5b292b2 100644
> --- a/testcases/kernel/syscalls/rt_sigprocmask/rt_sigprocmask01.c
> +++ b/testcases/kernel/syscalls/rt_sigprocmask/rt_sigprocmask01.c
> @@ -62,6 +62,12 @@
> #include "usctest.h"
> #include "linux_syscall_numbers.h"
>
> +#ifdef __x86_64__
> +#include "rt_signal.h"
> +#endif
> +
> +#define TEST_SIG SIGRTMIN+1
> +
> /* Extern Global Variables */
> extern int Tst_count; /* counter for tst_xxx routines. */
> extern char *TESTDIR; /* temporary dir created by tst_tmpdir() */
> @@ -131,7 +137,16 @@ void sig_handler(int sig)
> }
>
> int main(int ac, char **av) {
> - struct sigaction act, oact;
> +#ifdef __x86_64__
> + struct kernel_sigaction act, oact;
> + sig_initial(TEST_SIG);
> + act.sa_flags |= SA_RESTORER;
> + act.sa_restorer = restore_rt;
> + act.k_sa_handler = sig_handler;
> +#else
> + struct sigaction act, oact;
> + act.sa_handler = sig_handler;
> +#endif
> sigset_t set, oset;
> int lc; /* loop counter */
> char *msg; /* message returned from parse_opts */
> @@ -154,22 +169,21 @@ int main(int ac, char **av) {
> cleanup();
> tst_exit();
> }
> - TEST(sigaddset(&set, 33));
> + TEST(sigaddset(&set, TEST_SIG));
> if(TEST_RETURN == -1){
> tst_resm(TFAIL,"Call to sigaddset() Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> cleanup();
> tst_exit();
> }
> -
> +
> /* call rt_sigaction() */
> - act.sa_handler = sig_handler;
> - TEST(syscall(__NR_rt_sigaction, 33, &act, &oact, 8));
> + TEST(syscall(__NR_rt_sigaction, TEST_SIG, &act, &oact, 8));
> if(TEST_RETURN != 0){
> tst_resm(TFAIL,"Call to rt_sigaction() Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> cleanup();
> tst_exit();
> }
> - /* call rt_sigprocmask() to block signal#33 */
> + /* call rt_sigprocmask() to block signal#SIGRTMIN */
> TEST(syscall(__NR_rt_sigprocmask, SIG_BLOCK, &set, &oset, 8));
> if(TEST_RETURN == -1){
> tst_resm(TFAIL,"Call to rt_sigprocmask()**** Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> @@ -178,7 +192,7 @@ int main(int ac, char **av) {
> }
>
> else {
> - TEST(kill(getpid(), 33));
> + TEST(kill(getpid(), TEST_SIG));
> if(TEST_RETURN != 0){
> tst_resm(TFAIL,"Call to kill() Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> cleanup();
> @@ -198,13 +212,13 @@ int main(int ac, char **av) {
> cleanup();
> tst_exit();
> }
> - TEST(sigismember(&oset, 33));
> + TEST(sigismember(&oset, TEST_SIG));
> if(TEST_RETURN == 0 ){
> tst_resm(TFAIL,"call sigismember() Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> cleanup();
> tst_exit();
> }
> - /* call rt_sigprocmask() to unblock signal#33 */
> + /* call rt_sigprocmask() to unblock signal#SIGRTMIN */
> TEST(syscall(__NR_rt_sigprocmask, SIG_UNBLOCK, &set, &oset, 8));
> if(TEST_RETURN == -1){
> tst_resm(TFAIL,"Call to rt_sigprocmask() Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> diff --git a/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c b/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c
> index 416a7c9..84f2967 100644
> --- a/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c
> +++ b/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c
> @@ -47,6 +47,10 @@
> #include "usctest.h"
> #include "linux_syscall_numbers.h"
>
> +#ifdef __x86_64__
> +#include "rt_signal.h"
> +#endif
> +
> /* Extern Global Variables */
> extern int Tst_count; /* counter for tst_xxx routines. */
> extern char *TESTDIR; /* temporary dir created by tst_tmpdir() */
> @@ -139,9 +143,16 @@ int main(int ac, char **av) {
> cleanup();
> tst_exit();
> }
> +#ifdef __x86_64__
> + struct kernel_sigaction act, oact;
> + sig_initial(SIGALRM);
> + act.sa_flags |= SA_RESTORER;
> + act.sa_restorer = restore_rt;
> + act.k_sa_handler = sig_handler;
> +#else
> struct sigaction act, oact;
> act.sa_handler = sig_handler;
> -
> +#endif
> TEST(syscall(__NR_rt_sigaction, SIGALRM, &act, &oact, 8));
> if(TEST_RETURN == -1){
> tst_resm(TFAIL,"rt_sigaction() Failed, errno=%d : %s",TEST_ERRNO, strerror(TEST_ERRNO));
> --
> 1.6.2.2
>
>
>
>
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--
Thanks & Regards
Rishi
LTP Maintainer
IBM, LTC, Bangalore
Please join IRC #ltp @ irc.freenode.net

------------------------------------------------------------------------------
Download Intel&#174; Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.