--- /dev/null
+#!/bin/bash
+#
+# Copyright (C) - 2016 Julien Desfossez <jdesfossez@efficios.com>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License, version 2 only, as
+# published by the Free Software Foundation.
+#
+# 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., 51
+# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+TEST_DESC="Kernel tracer - select, poll and epoll payload extraction"
+
+CURDIR=$(dirname $0)/
+TESTDIR=$CURDIR/../..
+VALIDATE_SCRIPT="$CURDIR/validate_select_poll_epoll.py"
+NUM_TESTS=102
+
+# Only run this test on x86 and arm
+uname -m | grep -E "x86|i686|arm|aarch64" >/dev/null 2>&1
+if test $? != 0; then
+ exit 0
+fi
+
+DISABLE_VALIDATE=0
+# Babeltrace python bindings are required for the validation, but
+# it is not a mandatory dependancy of the project, so fail run the
+# without the content validation, at least we test that we are not
+# crashing the kernel.
+$VALIDATE_SCRIPT --help >/dev/null 2>&1
+if test $? != 0; then
+ echo "# Failed to run the validation script, Babeltrace Python bindings might be missing"
+ DISABLE_VALIDATE=1
+fi
+
+LAST_WARNING=$(dmesg | grep " WARNING:" | cut -d' ' -f1 | tail -1)
+LAST_OOPS=$(dmesg | grep " OOPS:" | cut -d' ' -f1 | tail -1)
+LAST_BUG=$(dmesg | grep " BUG:" | cut -d' ' -f1 | tail -1)
+
+source $TESTDIR/utils/utils.sh
+
+function check_trace_content()
+{
+ if test $DISABLE_VALIDATE == 1; then
+ ok 0 "Validation skipped"
+ return
+ fi
+
+ $VALIDATE_SCRIPT $@
+ if test $? = 0; then
+ ok 0 "Validation success"
+ else
+ fail "Validation"
+ fi
+}
+
+function test_working_cases()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+
+ # arm64 does not have epoll_wait
+ uname -m | grep -E "aarch64" >/dev/null 2>&1
+ if test $? = 0; then
+ SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_pwait"
+ else
+ SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_wait,epoll_pwait"
+ fi
+
+ diag "Working cases for select, pselect6, poll, ppoll and epoll, waiting for input"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 1); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 1 -p $pid $TRACE_PATH
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_timeout_cases()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+
+ # arm64 does not have epoll_wait
+ uname -m | grep -E "aarch64" >/dev/null 2>&1
+ if test $? = 0; then
+ SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_pwait"
+ else
+ SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_wait,epoll_pwait"
+ fi
+
+ diag "Timeout cases (1ms) for select, pselect6, poll, ppoll and epoll"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME "$SYSCALL_LIST"
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$($CURDIR/select_poll_epoll -t 2); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 2 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_big_pselect()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="pselect6"
+
+ diag "pselect with a FD > 1023"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$($CURDIR/select_poll_epoll -t 3); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 3 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_big_ppoll()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="ppoll"
+
+ diag "ppoll with 2047 FDs"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 4); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 4 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_ppoll_overflow()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="ppoll"
+
+ diag "ppoll buffer overflow, should segfault, waits for input"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ diag "Expect segfaults"
+ { out=$(yes | $CURDIR/select_poll_epoll -t 5); } 2>/dev/null
+ stop_lttng_tracing_ok
+ echo $out
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+
+ check_trace_content -t 5 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_pselect_invalid_ptr()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="pselect6"
+
+ diag "pselect with invalid pointer, waits for input"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 6); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 6 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_ppoll_ulong_max()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="ppoll"
+
+ diag "ppoll with ulong_max fds, waits for input"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 7); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 7 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_epoll_pwait_invalid_ptr()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="epoll_pwait"
+
+ diag "epoll_pwait with invalid pointer, waits for input"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 8); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 8 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_epoll_pwait_int_max()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="epoll_pwait"
+
+ diag "epoll_pwait with maxevents set to INT_MAX, waits for input"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 9); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 9 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_ppoll_concurrent()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="ppoll"
+
+ diag "ppoll with concurrent updates of the structure from user-space, stress test (3000 iterations), waits for input + timeout 1ms"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ { out=$(yes | $CURDIR/select_poll_epoll -t 10); } 2>/dev/null
+ stop_lttng_tracing_ok
+ pid=$(echo $out | cut -d' ' -f1)
+
+ validate_trace "$SYSCALL_LIST" $TRACE_PATH
+ check_trace_content -t 10 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+function test_epoll_pwait_concurrent()
+{
+ TRACE_PATH=$(mktemp -d)
+ SESSION_NAME="syscall_payload"
+ SYSCALL_LIST="epoll_ctl,epoll_pwait"
+
+ diag "epoll_pwait with concurrent munmap of the buffer from user-space, should randomly segfault, run multiple times, waits for input + timeout 1ms"
+
+ create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+ lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST
+ add_context_kernel_ok $SESSION_NAME channel0 pid
+
+ start_lttng_tracing_ok
+ diag "Expect segfaults"
+ for i in $(seq 1 100); do
+ { out=$($CURDIR/select_poll_epoll -t 11); } 2>/dev/null
+ done
+ pid=$(echo $out | cut -d' ' -f1)
+ stop_lttng_tracing_ok
+
+ # epoll_wait is not always generated in the trace (stress test)
+ validate_trace "epoll_ctl" $TRACE_PATH
+ check_trace_content -t 11 -p $pid $TRACE_PATH 2>/dev/null
+
+ destroy_lttng_session_ok $SESSION_NAME
+
+ rm -rf $TRACE_PATH
+}
+
+# MUST set TESTDIR before calling those functions
+plan_tests $NUM_TESTS
+
+print_test_banner "$TEST_DESC"
+
+if [ "$(id -u)" == "0" ]; then
+ isroot=1
+else
+ isroot=0
+fi
+
+skip $isroot "Root access is needed. Skipping all tests." $NUM_TESTS ||
+{
+ start_lttng_sessiond
+
+ test_working_cases
+ test_timeout_cases
+ test_big_pselect
+ test_big_ppoll
+ test_ppoll_overflow
+ test_pselect_invalid_ptr
+ test_ppoll_ulong_max
+ test_epoll_pwait_invalid_ptr
+ test_epoll_pwait_int_max
+ test_ppoll_concurrent
+ test_epoll_pwait_concurrent
+
+ stop_lttng_sessiond
+
+ NEW_WARNING=$(dmesg | grep " WARNING:" | cut -d' ' -f1 | tail -1)
+ NEW_OOPS=$(dmesg | grep " OOPS:" | cut -d' ' -f1 | tail -1)
+ NEW_BUG=$(dmesg | grep " BUG:" | cut -d' ' -f1 | tail -1)
+
+ if test "$LAST_WARNING" != "$NEW_WARNING"; then
+ fail "New WARNING generated"
+ fi
+ if test "$LAST_OOPS" != "$NEW_OOPS"; then
+ fail "New OOPS generated"
+ fi
+ if test "$LAST_BUG" != "$NEW_BUG"; then
+ fail "New BUG generated"
+ fi
+}
projects / lttng-tools.git / blobdiff