| 1 | #!/bin/bash |
| 2 | # |
| 3 | # Copyright (C) - 2016 Julien Desfossez <jdesfossez@efficios.com> |
| 4 | # |
| 5 | # This program is free software; you can redistribute it and/or modify it |
| 6 | # under the terms of the GNU General Public License, version 2 only, as |
| 7 | # published by the Free Software Foundation. |
| 8 | # |
| 9 | # This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | # more details. |
| 13 | # |
| 14 | # You should have received a copy of the GNU General Public License along with |
| 15 | # this program; if not, write to the Free Software Foundation, Inc., 51 |
| 16 | # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | |
| 18 | TEST_DESC="Kernel tracer - select, poll and epoll payload extraction" |
| 19 | |
| 20 | CURDIR=$(dirname $0)/ |
| 21 | TESTDIR=$CURDIR/../.. |
| 22 | VALIDATE_SCRIPT="$CURDIR/validate_select_poll_epoll.py" |
| 23 | NUM_TESTS=102 |
| 24 | |
| 25 | # Only run this test on x86 and arm |
| 26 | uname -m | grep -E "x86|i686|arm|aarch64" >/dev/null 2>&1 |
| 27 | if test $? != 0; then |
| 28 | exit 0 |
| 29 | fi |
| 30 | |
| 31 | DISABLE_VALIDATE=0 |
| 32 | # Babeltrace python bindings are required for the validation, but |
| 33 | # it is not a mandatory dependancy of the project, so fail run the |
| 34 | # without the content validation, at least we test that we are not |
| 35 | # crashing the kernel. |
| 36 | $VALIDATE_SCRIPT --help >/dev/null 2>&1 |
| 37 | if test $? != 0; then |
| 38 | echo "# Failed to run the validation script, Babeltrace Python bindings might be missing" |
| 39 | DISABLE_VALIDATE=1 |
| 40 | fi |
| 41 | |
| 42 | LAST_WARNING=$(dmesg | grep " WARNING:" | cut -d' ' -f1 | tail -1) |
| 43 | LAST_OOPS=$(dmesg | grep " OOPS:" | cut -d' ' -f1 | tail -1) |
| 44 | LAST_BUG=$(dmesg | grep " BUG:" | cut -d' ' -f1 | tail -1) |
| 45 | |
| 46 | source $TESTDIR/utils/utils.sh |
| 47 | |
| 48 | function check_trace_content() |
| 49 | { |
| 50 | if test $DISABLE_VALIDATE == 1; then |
| 51 | ok 0 "Validation skipped" |
| 52 | return |
| 53 | fi |
| 54 | |
| 55 | $VALIDATE_SCRIPT $@ |
| 56 | if test $? = 0; then |
| 57 | ok 0 "Validation success" |
| 58 | else |
| 59 | fail "Validation" |
| 60 | fi |
| 61 | } |
| 62 | |
| 63 | function test_working_cases() |
| 64 | { |
| 65 | TRACE_PATH=$(mktemp -d) |
| 66 | SESSION_NAME="syscall_payload" |
| 67 | |
| 68 | # arm64 does not have epoll_wait |
| 69 | uname -m | grep -E "aarch64" >/dev/null 2>&1 |
| 70 | if test $? = 0; then |
| 71 | SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_pwait" |
| 72 | else |
| 73 | SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_wait,epoll_pwait" |
| 74 | fi |
| 75 | |
| 76 | diag "Working cases for select, pselect6, poll, ppoll and epoll, waiting for input" |
| 77 | |
| 78 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 79 | |
| 80 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 81 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 82 | |
| 83 | start_lttng_tracing_ok |
| 84 | { out=$(yes | $CURDIR/select_poll_epoll -t 1); } 2>/dev/null |
| 85 | stop_lttng_tracing_ok |
| 86 | pid=$(echo $out | cut -d' ' -f1) |
| 87 | |
| 88 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 89 | check_trace_content -t 1 -p $pid $TRACE_PATH |
| 90 | |
| 91 | destroy_lttng_session_ok $SESSION_NAME |
| 92 | |
| 93 | rm -rf $TRACE_PATH |
| 94 | } |
| 95 | |
| 96 | function test_timeout_cases() |
| 97 | { |
| 98 | TRACE_PATH=$(mktemp -d) |
| 99 | SESSION_NAME="syscall_payload" |
| 100 | |
| 101 | # arm64 does not have epoll_wait |
| 102 | uname -m | grep -E "aarch64" >/dev/null 2>&1 |
| 103 | if test $? = 0; then |
| 104 | SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_pwait" |
| 105 | else |
| 106 | SYSCALL_LIST="select,pselect6,poll,ppoll,epoll_ctl,epoll_wait,epoll_pwait" |
| 107 | fi |
| 108 | |
| 109 | diag "Timeout cases (1ms) for select, pselect6, poll, ppoll and epoll" |
| 110 | |
| 111 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 112 | |
| 113 | lttng_enable_kernel_syscall_ok $SESSION_NAME "$SYSCALL_LIST" |
| 114 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 115 | |
| 116 | start_lttng_tracing_ok |
| 117 | { out=$($CURDIR/select_poll_epoll -t 2); } 2>/dev/null |
| 118 | stop_lttng_tracing_ok |
| 119 | pid=$(echo $out | cut -d' ' -f1) |
| 120 | |
| 121 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 122 | check_trace_content -t 2 -p $pid $TRACE_PATH 2>/dev/null |
| 123 | |
| 124 | destroy_lttng_session_ok $SESSION_NAME |
| 125 | |
| 126 | rm -rf $TRACE_PATH |
| 127 | } |
| 128 | |
| 129 | function test_big_pselect() |
| 130 | { |
| 131 | TRACE_PATH=$(mktemp -d) |
| 132 | SESSION_NAME="syscall_payload" |
| 133 | SYSCALL_LIST="pselect6" |
| 134 | |
| 135 | diag "pselect with a FD > 1023" |
| 136 | |
| 137 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 138 | |
| 139 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 140 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 141 | |
| 142 | start_lttng_tracing_ok |
| 143 | { out=$($CURDIR/select_poll_epoll -t 3); } 2>/dev/null |
| 144 | stop_lttng_tracing_ok |
| 145 | pid=$(echo $out | cut -d' ' -f1) |
| 146 | |
| 147 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 148 | check_trace_content -t 3 -p $pid $TRACE_PATH 2>/dev/null |
| 149 | |
| 150 | destroy_lttng_session_ok $SESSION_NAME |
| 151 | |
| 152 | rm -rf $TRACE_PATH |
| 153 | } |
| 154 | |
| 155 | function test_big_ppoll() |
| 156 | { |
| 157 | TRACE_PATH=$(mktemp -d) |
| 158 | SESSION_NAME="syscall_payload" |
| 159 | SYSCALL_LIST="ppoll" |
| 160 | |
| 161 | diag "ppoll with 2047 FDs" |
| 162 | |
| 163 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 164 | |
| 165 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 166 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 167 | |
| 168 | start_lttng_tracing_ok |
| 169 | { out=$(yes | $CURDIR/select_poll_epoll -t 4); } 2>/dev/null |
| 170 | stop_lttng_tracing_ok |
| 171 | pid=$(echo $out | cut -d' ' -f1) |
| 172 | |
| 173 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 174 | check_trace_content -t 4 -p $pid $TRACE_PATH 2>/dev/null |
| 175 | |
| 176 | destroy_lttng_session_ok $SESSION_NAME |
| 177 | |
| 178 | rm -rf $TRACE_PATH |
| 179 | } |
| 180 | |
| 181 | function test_ppoll_overflow() |
| 182 | { |
| 183 | TRACE_PATH=$(mktemp -d) |
| 184 | SESSION_NAME="syscall_payload" |
| 185 | SYSCALL_LIST="ppoll" |
| 186 | |
| 187 | diag "ppoll buffer overflow, should segfault, waits for input" |
| 188 | |
| 189 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 190 | |
| 191 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 192 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 193 | |
| 194 | start_lttng_tracing_ok |
| 195 | diag "Expect segfaults" |
| 196 | { out=$(yes | $CURDIR/select_poll_epoll -t 5); } 2>/dev/null |
| 197 | stop_lttng_tracing_ok |
| 198 | echo $out |
| 199 | pid=$(echo $out | cut -d' ' -f1) |
| 200 | |
| 201 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 202 | |
| 203 | check_trace_content -t 5 -p $pid $TRACE_PATH 2>/dev/null |
| 204 | |
| 205 | destroy_lttng_session_ok $SESSION_NAME |
| 206 | |
| 207 | rm -rf $TRACE_PATH |
| 208 | } |
| 209 | |
| 210 | function test_pselect_invalid_ptr() |
| 211 | { |
| 212 | TRACE_PATH=$(mktemp -d) |
| 213 | SESSION_NAME="syscall_payload" |
| 214 | SYSCALL_LIST="pselect6" |
| 215 | |
| 216 | diag "pselect with invalid pointer, waits for input" |
| 217 | |
| 218 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 219 | |
| 220 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 221 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 222 | |
| 223 | start_lttng_tracing_ok |
| 224 | { out=$(yes | $CURDIR/select_poll_epoll -t 6); } 2>/dev/null |
| 225 | stop_lttng_tracing_ok |
| 226 | pid=$(echo $out | cut -d' ' -f1) |
| 227 | |
| 228 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 229 | check_trace_content -t 6 -p $pid $TRACE_PATH 2>/dev/null |
| 230 | |
| 231 | destroy_lttng_session_ok $SESSION_NAME |
| 232 | |
| 233 | rm -rf $TRACE_PATH |
| 234 | } |
| 235 | |
| 236 | function test_ppoll_ulong_max() |
| 237 | { |
| 238 | TRACE_PATH=$(mktemp -d) |
| 239 | SESSION_NAME="syscall_payload" |
| 240 | SYSCALL_LIST="ppoll" |
| 241 | |
| 242 | diag "ppoll with ulong_max fds, waits for input" |
| 243 | |
| 244 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 245 | |
| 246 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 247 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 248 | |
| 249 | start_lttng_tracing_ok |
| 250 | { out=$(yes | $CURDIR/select_poll_epoll -t 7); } 2>/dev/null |
| 251 | stop_lttng_tracing_ok |
| 252 | pid=$(echo $out | cut -d' ' -f1) |
| 253 | |
| 254 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 255 | check_trace_content -t 7 -p $pid $TRACE_PATH 2>/dev/null |
| 256 | |
| 257 | destroy_lttng_session_ok $SESSION_NAME |
| 258 | |
| 259 | rm -rf $TRACE_PATH |
| 260 | } |
| 261 | |
| 262 | function test_epoll_pwait_invalid_ptr() |
| 263 | { |
| 264 | TRACE_PATH=$(mktemp -d) |
| 265 | SESSION_NAME="syscall_payload" |
| 266 | SYSCALL_LIST="epoll_pwait" |
| 267 | |
| 268 | diag "epoll_pwait with invalid pointer, waits for input" |
| 269 | |
| 270 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 271 | |
| 272 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 273 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 274 | |
| 275 | start_lttng_tracing_ok |
| 276 | { out=$(yes | $CURDIR/select_poll_epoll -t 8); } 2>/dev/null |
| 277 | stop_lttng_tracing_ok |
| 278 | pid=$(echo $out | cut -d' ' -f1) |
| 279 | |
| 280 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 281 | check_trace_content -t 8 -p $pid $TRACE_PATH 2>/dev/null |
| 282 | |
| 283 | destroy_lttng_session_ok $SESSION_NAME |
| 284 | |
| 285 | rm -rf $TRACE_PATH |
| 286 | } |
| 287 | |
| 288 | function test_epoll_pwait_int_max() |
| 289 | { |
| 290 | TRACE_PATH=$(mktemp -d) |
| 291 | SESSION_NAME="syscall_payload" |
| 292 | SYSCALL_LIST="epoll_pwait" |
| 293 | |
| 294 | diag "epoll_pwait with maxevents set to INT_MAX, waits for input" |
| 295 | |
| 296 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 297 | |
| 298 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 299 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 300 | |
| 301 | start_lttng_tracing_ok |
| 302 | { out=$(yes | $CURDIR/select_poll_epoll -t 9); } 2>/dev/null |
| 303 | stop_lttng_tracing_ok |
| 304 | pid=$(echo $out | cut -d' ' -f1) |
| 305 | |
| 306 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 307 | check_trace_content -t 9 -p $pid $TRACE_PATH 2>/dev/null |
| 308 | |
| 309 | destroy_lttng_session_ok $SESSION_NAME |
| 310 | |
| 311 | rm -rf $TRACE_PATH |
| 312 | } |
| 313 | |
| 314 | function test_ppoll_concurrent() |
| 315 | { |
| 316 | TRACE_PATH=$(mktemp -d) |
| 317 | SESSION_NAME="syscall_payload" |
| 318 | SYSCALL_LIST="ppoll" |
| 319 | |
| 320 | diag "ppoll with concurrent updates of the structure from user-space, stress test (3000 iterations), waits for input + timeout 1ms" |
| 321 | |
| 322 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 323 | |
| 324 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 325 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 326 | |
| 327 | start_lttng_tracing_ok |
| 328 | { out=$(yes | $CURDIR/select_poll_epoll -t 10); } 2>/dev/null |
| 329 | stop_lttng_tracing_ok |
| 330 | pid=$(echo $out | cut -d' ' -f1) |
| 331 | |
| 332 | validate_trace "$SYSCALL_LIST" $TRACE_PATH |
| 333 | check_trace_content -t 10 -p $pid $TRACE_PATH 2>/dev/null |
| 334 | |
| 335 | destroy_lttng_session_ok $SESSION_NAME |
| 336 | |
| 337 | rm -rf $TRACE_PATH |
| 338 | } |
| 339 | |
| 340 | function test_epoll_pwait_concurrent() |
| 341 | { |
| 342 | TRACE_PATH=$(mktemp -d) |
| 343 | SESSION_NAME="syscall_payload" |
| 344 | SYSCALL_LIST="epoll_ctl,epoll_pwait" |
| 345 | |
| 346 | diag "epoll_pwait with concurrent munmap of the buffer from user-space, should randomly segfault, run multiple times, waits for input + timeout 1ms" |
| 347 | |
| 348 | create_lttng_session_ok $SESSION_NAME $TRACE_PATH |
| 349 | |
| 350 | lttng_enable_kernel_syscall_ok $SESSION_NAME $SYSCALL_LIST |
| 351 | add_context_kernel_ok $SESSION_NAME channel0 pid |
| 352 | |
| 353 | start_lttng_tracing_ok |
| 354 | diag "Expect segfaults" |
| 355 | for i in $(seq 1 100); do |
| 356 | { out=$($CURDIR/select_poll_epoll -t 11); } 2>/dev/null |
| 357 | done |
| 358 | pid=$(echo $out | cut -d' ' -f1) |
| 359 | stop_lttng_tracing_ok |
| 360 | |
| 361 | # epoll_wait is not always generated in the trace (stress test) |
| 362 | validate_trace "epoll_ctl" $TRACE_PATH |
| 363 | check_trace_content -t 11 -p $pid $TRACE_PATH 2>/dev/null |
| 364 | |
| 365 | destroy_lttng_session_ok $SESSION_NAME |
| 366 | |
| 367 | rm -rf $TRACE_PATH |
| 368 | } |
| 369 | |
| 370 | # MUST set TESTDIR before calling those functions |
| 371 | plan_tests $NUM_TESTS |
| 372 | |
| 373 | print_test_banner "$TEST_DESC" |
| 374 | |
| 375 | if [ "$(id -u)" == "0" ]; then |
| 376 | isroot=1 |
| 377 | else |
| 378 | isroot=0 |
| 379 | fi |
| 380 | |
| 381 | skip $isroot "Root access is needed. Skipping all tests." $NUM_TESTS || |
| 382 | { |
| 383 | start_lttng_sessiond |
| 384 | |
| 385 | test_working_cases |
| 386 | test_timeout_cases |
| 387 | test_big_pselect |
| 388 | test_big_ppoll |
| 389 | test_ppoll_overflow |
| 390 | test_pselect_invalid_ptr |
| 391 | test_ppoll_ulong_max |
| 392 | test_epoll_pwait_invalid_ptr |
| 393 | test_epoll_pwait_int_max |
| 394 | test_ppoll_concurrent |
| 395 | test_epoll_pwait_concurrent |
| 396 | |
| 397 | stop_lttng_sessiond |
| 398 | |
| 399 | NEW_WARNING=$(dmesg | grep " WARNING:" | cut -d' ' -f1 | tail -1) |
| 400 | NEW_OOPS=$(dmesg | grep " OOPS:" | cut -d' ' -f1 | tail -1) |
| 401 | NEW_BUG=$(dmesg | grep " BUG:" | cut -d' ' -f1 | tail -1) |
| 402 | |
| 403 | if test "$LAST_WARNING" != "$NEW_WARNING"; then |
| 404 | fail "New WARNING generated" |
| 405 | fi |
| 406 | if test "$LAST_OOPS" != "$NEW_OOPS"; then |
| 407 | fail "New OOPS generated" |
| 408 | fi |
| 409 | if test "$LAST_BUG" != "$NEW_BUG"; then |
| 410 | fail "New BUG generated" |
| 411 | fi |
| 412 | } |