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502 lines
16 KiB
502 lines
16 KiB
/* |
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* This application is Copyright 2012 Red Hat, Inc. |
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* Doug Ledford <[email protected]> |
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* |
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* mq_open_tests is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3. |
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* |
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* mq_open_tests is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* For the full text of the license, see <http://www.gnu.org/licenses/>. |
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* |
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* mq_open_tests.c |
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* Tests the various situations that should either succeed or fail to |
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* open a posix message queue and then reports whether or not they |
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* did as they were supposed to. |
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* |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <string.h> |
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#include <limits.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/stat.h> |
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#include <mqueue.h> |
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#include <error.h> |
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#include "../kselftest.h" |
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static char *usage = |
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"Usage:\n" |
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" %s path\n" |
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"\n" |
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" path Path name of the message queue to create\n" |
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"\n" |
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" Note: this program must be run as root in order to enable all tests\n" |
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"\n"; |
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char *DEF_MSGS = "/proc/sys/fs/mqueue/msg_default"; |
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char *DEF_MSGSIZE = "/proc/sys/fs/mqueue/msgsize_default"; |
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char *MAX_MSGS = "/proc/sys/fs/mqueue/msg_max"; |
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char *MAX_MSGSIZE = "/proc/sys/fs/mqueue/msgsize_max"; |
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int default_settings; |
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struct rlimit saved_limits, cur_limits; |
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int saved_def_msgs, saved_def_msgsize, saved_max_msgs, saved_max_msgsize; |
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int cur_def_msgs, cur_def_msgsize, cur_max_msgs, cur_max_msgsize; |
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FILE *def_msgs, *def_msgsize, *max_msgs, *max_msgsize; |
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char *queue_path; |
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char *default_queue_path = "/test1"; |
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mqd_t queue = -1; |
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static inline void __set(FILE *stream, int value, char *err_msg); |
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void shutdown(int exit_val, char *err_cause, int line_no); |
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static inline int get(FILE *stream); |
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static inline void set(FILE *stream, int value); |
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static inline void getr(int type, struct rlimit *rlim); |
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static inline void setr(int type, struct rlimit *rlim); |
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void validate_current_settings(); |
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static inline void test_queue(struct mq_attr *attr, struct mq_attr *result); |
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static inline int test_queue_fail(struct mq_attr *attr, struct mq_attr *result); |
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static inline void __set(FILE *stream, int value, char *err_msg) |
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{ |
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rewind(stream); |
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if (fprintf(stream, "%d", value) < 0) |
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perror(err_msg); |
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} |
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void shutdown(int exit_val, char *err_cause, int line_no) |
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{ |
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static int in_shutdown = 0; |
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/* In case we get called recursively by a set() call below */ |
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if (in_shutdown++) |
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return; |
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if (seteuid(0) == -1) |
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perror("seteuid() failed"); |
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if (queue != -1) |
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if (mq_close(queue)) |
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perror("mq_close() during shutdown"); |
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if (queue_path) |
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/* |
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* Be silent if this fails, if we cleaned up already it's |
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* expected to fail |
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*/ |
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mq_unlink(queue_path); |
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if (default_settings) { |
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if (saved_def_msgs) |
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__set(def_msgs, saved_def_msgs, |
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"failed to restore saved_def_msgs"); |
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if (saved_def_msgsize) |
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__set(def_msgsize, saved_def_msgsize, |
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"failed to restore saved_def_msgsize"); |
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} |
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if (saved_max_msgs) |
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__set(max_msgs, saved_max_msgs, |
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"failed to restore saved_max_msgs"); |
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if (saved_max_msgsize) |
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__set(max_msgsize, saved_max_msgsize, |
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"failed to restore saved_max_msgsize"); |
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if (exit_val) |
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error(exit_val, errno, "%s at %d", err_cause, line_no); |
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exit(0); |
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} |
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static inline int get(FILE *stream) |
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{ |
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int value; |
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rewind(stream); |
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if (fscanf(stream, "%d", &value) != 1) |
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shutdown(4, "Error reading /proc entry", __LINE__ - 1); |
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return value; |
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} |
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static inline void set(FILE *stream, int value) |
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{ |
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int new_value; |
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rewind(stream); |
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if (fprintf(stream, "%d", value) < 0) |
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return shutdown(5, "Failed writing to /proc file", |
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__LINE__ - 1); |
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new_value = get(stream); |
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if (new_value != value) |
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return shutdown(5, "We didn't get what we wrote to /proc back", |
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__LINE__ - 1); |
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} |
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static inline void getr(int type, struct rlimit *rlim) |
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{ |
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if (getrlimit(type, rlim)) |
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shutdown(6, "getrlimit()", __LINE__ - 1); |
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} |
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static inline void setr(int type, struct rlimit *rlim) |
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{ |
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if (setrlimit(type, rlim)) |
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shutdown(7, "setrlimit()", __LINE__ - 1); |
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} |
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void validate_current_settings() |
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{ |
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int rlim_needed; |
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if (cur_limits.rlim_cur < 4096) { |
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printf("Current rlimit value for POSIX message queue bytes is " |
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"unreasonably low,\nincreasing.\n\n"); |
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cur_limits.rlim_cur = 8192; |
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cur_limits.rlim_max = 16384; |
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setr(RLIMIT_MSGQUEUE, &cur_limits); |
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} |
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if (default_settings) { |
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rlim_needed = (cur_def_msgs + 1) * (cur_def_msgsize + 1 + |
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2 * sizeof(void *)); |
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if (rlim_needed > cur_limits.rlim_cur) { |
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printf("Temporarily lowering default queue parameters " |
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"to something that will work\n" |
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"with the current rlimit values.\n\n"); |
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set(def_msgs, 10); |
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cur_def_msgs = 10; |
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set(def_msgsize, 128); |
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cur_def_msgsize = 128; |
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} |
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} else { |
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rlim_needed = (cur_max_msgs + 1) * (cur_max_msgsize + 1 + |
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2 * sizeof(void *)); |
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if (rlim_needed > cur_limits.rlim_cur) { |
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printf("Temporarily lowering maximum queue parameters " |
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"to something that will work\n" |
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"with the current rlimit values in case this is " |
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"a kernel that ties the default\n" |
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"queue parameters to the maximum queue " |
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"parameters.\n\n"); |
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set(max_msgs, 10); |
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cur_max_msgs = 10; |
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set(max_msgsize, 128); |
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cur_max_msgsize = 128; |
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} |
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} |
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} |
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/* |
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* test_queue - Test opening a queue, shutdown if we fail. This should |
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* only be called in situations that should never fail. We clean up |
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* after ourselves and return the queue attributes in *result. |
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*/ |
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static inline void test_queue(struct mq_attr *attr, struct mq_attr *result) |
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{ |
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int flags = O_RDWR | O_EXCL | O_CREAT; |
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int perms = DEFFILEMODE; |
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if ((queue = mq_open(queue_path, flags, perms, attr)) == -1) |
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shutdown(1, "mq_open()", __LINE__); |
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if (mq_getattr(queue, result)) |
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shutdown(1, "mq_getattr()", __LINE__); |
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if (mq_close(queue)) |
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shutdown(1, "mq_close()", __LINE__); |
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queue = -1; |
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if (mq_unlink(queue_path)) |
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shutdown(1, "mq_unlink()", __LINE__); |
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} |
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/* |
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* Same as test_queue above, but failure is not fatal. |
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* Returns: |
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* 0 - Failed to create a queue |
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* 1 - Created a queue, attributes in *result |
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*/ |
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static inline int test_queue_fail(struct mq_attr *attr, struct mq_attr *result) |
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{ |
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int flags = O_RDWR | O_EXCL | O_CREAT; |
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int perms = DEFFILEMODE; |
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if ((queue = mq_open(queue_path, flags, perms, attr)) == -1) |
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return 0; |
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if (mq_getattr(queue, result)) |
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shutdown(1, "mq_getattr()", __LINE__); |
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if (mq_close(queue)) |
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shutdown(1, "mq_close()", __LINE__); |
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queue = -1; |
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if (mq_unlink(queue_path)) |
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shutdown(1, "mq_unlink()", __LINE__); |
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return 1; |
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} |
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int main(int argc, char *argv[]) |
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{ |
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struct mq_attr attr, result; |
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if (argc != 2) { |
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printf("Using Default queue path - %s\n", default_queue_path); |
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queue_path = default_queue_path; |
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} else { |
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/* |
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* Although we can create a msg queue with a non-absolute path name, |
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* unlink will fail. So, if the name doesn't start with a /, add one |
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* when we save it. |
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*/ |
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if (*argv[1] == '/') |
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queue_path = strdup(argv[1]); |
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else { |
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queue_path = malloc(strlen(argv[1]) + 2); |
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if (!queue_path) { |
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perror("malloc()"); |
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exit(1); |
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} |
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queue_path[0] = '/'; |
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queue_path[1] = 0; |
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strcat(queue_path, argv[1]); |
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} |
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} |
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if (getuid() != 0) |
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ksft_exit_skip("Not running as root, but almost all tests " |
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"require root in order to modify\nsystem settings. " |
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"Exiting.\n"); |
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/* Find out what files there are for us to make tweaks in */ |
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def_msgs = fopen(DEF_MSGS, "r+"); |
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def_msgsize = fopen(DEF_MSGSIZE, "r+"); |
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max_msgs = fopen(MAX_MSGS, "r+"); |
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max_msgsize = fopen(MAX_MSGSIZE, "r+"); |
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if (!max_msgs) |
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shutdown(2, "Failed to open msg_max", __LINE__); |
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if (!max_msgsize) |
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shutdown(2, "Failed to open msgsize_max", __LINE__); |
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if (def_msgs || def_msgsize) |
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default_settings = 1; |
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/* Load up the current system values for everything we can */ |
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getr(RLIMIT_MSGQUEUE, &saved_limits); |
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cur_limits = saved_limits; |
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if (default_settings) { |
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saved_def_msgs = cur_def_msgs = get(def_msgs); |
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saved_def_msgsize = cur_def_msgsize = get(def_msgsize); |
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} |
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saved_max_msgs = cur_max_msgs = get(max_msgs); |
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saved_max_msgsize = cur_max_msgsize = get(max_msgsize); |
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/* Tell the user our initial state */ |
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printf("\nInitial system state:\n"); |
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printf("\tUsing queue path:\t\t%s\n", queue_path); |
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printf("\tRLIMIT_MSGQUEUE(soft):\t\t%ld\n", |
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(long) saved_limits.rlim_cur); |
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printf("\tRLIMIT_MSGQUEUE(hard):\t\t%ld\n", |
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(long) saved_limits.rlim_max); |
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printf("\tMaximum Message Size:\t\t%d\n", saved_max_msgsize); |
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printf("\tMaximum Queue Size:\t\t%d\n", saved_max_msgs); |
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if (default_settings) { |
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printf("\tDefault Message Size:\t\t%d\n", saved_def_msgsize); |
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printf("\tDefault Queue Size:\t\t%d\n", saved_def_msgs); |
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} else { |
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printf("\tDefault Message Size:\t\tNot Supported\n"); |
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printf("\tDefault Queue Size:\t\tNot Supported\n"); |
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} |
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printf("\n"); |
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validate_current_settings(); |
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printf("Adjusted system state for testing:\n"); |
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printf("\tRLIMIT_MSGQUEUE(soft):\t\t%ld\n", (long) cur_limits.rlim_cur); |
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printf("\tRLIMIT_MSGQUEUE(hard):\t\t%ld\n", (long) cur_limits.rlim_max); |
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printf("\tMaximum Message Size:\t\t%d\n", cur_max_msgsize); |
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printf("\tMaximum Queue Size:\t\t%d\n", cur_max_msgs); |
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if (default_settings) { |
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printf("\tDefault Message Size:\t\t%d\n", cur_def_msgsize); |
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printf("\tDefault Queue Size:\t\t%d\n", cur_def_msgs); |
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} |
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printf("\n\nTest series 1, behavior when no attr struct " |
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"passed to mq_open:\n"); |
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if (!default_settings) { |
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test_queue(NULL, &result); |
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printf("Given sane system settings, mq_open without an attr " |
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"struct succeeds:\tPASS\n"); |
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if (result.mq_maxmsg != cur_max_msgs || |
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result.mq_msgsize != cur_max_msgsize) { |
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printf("Kernel does not support setting the default " |
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"mq attributes,\nbut also doesn't tie the " |
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"defaults to the maximums:\t\t\tPASS\n"); |
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} else { |
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set(max_msgs, ++cur_max_msgs); |
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set(max_msgsize, ++cur_max_msgsize); |
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test_queue(NULL, &result); |
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if (result.mq_maxmsg == cur_max_msgs && |
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result.mq_msgsize == cur_max_msgsize) |
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printf("Kernel does not support setting the " |
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"default mq attributes and\n" |
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"also ties system wide defaults to " |
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"the system wide maximums:\t\t" |
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"FAIL\n"); |
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else |
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printf("Kernel does not support setting the " |
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"default mq attributes,\n" |
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"but also doesn't tie the defaults to " |
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"the maximums:\t\t\tPASS\n"); |
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} |
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} else { |
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printf("Kernel supports setting defaults separately from " |
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"maximums:\t\tPASS\n"); |
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/* |
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* While we are here, go ahead and test that the kernel |
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* properly follows the default settings |
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*/ |
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test_queue(NULL, &result); |
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printf("Given sane values, mq_open without an attr struct " |
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"succeeds:\t\tPASS\n"); |
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if (result.mq_maxmsg != cur_def_msgs || |
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result.mq_msgsize != cur_def_msgsize) |
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printf("Kernel supports setting defaults, but does " |
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"not actually honor them:\tFAIL\n\n"); |
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else { |
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set(def_msgs, ++cur_def_msgs); |
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set(def_msgsize, ++cur_def_msgsize); |
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/* In case max was the same as the default */ |
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set(max_msgs, ++cur_max_msgs); |
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set(max_msgsize, ++cur_max_msgsize); |
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test_queue(NULL, &result); |
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if (result.mq_maxmsg != cur_def_msgs || |
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result.mq_msgsize != cur_def_msgsize) |
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printf("Kernel supports setting defaults, but " |
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"does not actually honor them:\t" |
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"FAIL\n"); |
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else |
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printf("Kernel properly honors default setting " |
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"knobs:\t\t\t\tPASS\n"); |
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} |
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set(def_msgs, cur_max_msgs + 1); |
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cur_def_msgs = cur_max_msgs + 1; |
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set(def_msgsize, cur_max_msgsize + 1); |
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cur_def_msgsize = cur_max_msgsize + 1; |
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if (cur_def_msgs * (cur_def_msgsize + 2 * sizeof(void *)) >= |
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cur_limits.rlim_cur) { |
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cur_limits.rlim_cur = (cur_def_msgs + 2) * |
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(cur_def_msgsize + 2 * sizeof(void *)); |
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cur_limits.rlim_max = 2 * cur_limits.rlim_cur; |
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setr(RLIMIT_MSGQUEUE, &cur_limits); |
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} |
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if (test_queue_fail(NULL, &result)) { |
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if (result.mq_maxmsg == cur_max_msgs && |
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result.mq_msgsize == cur_max_msgsize) |
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printf("Kernel properly limits default values " |
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"to lesser of default/max:\t\tPASS\n"); |
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else |
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printf("Kernel does not properly set default " |
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"queue parameters when\ndefaults > " |
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"max:\t\t\t\t\t\t\t\tFAIL\n"); |
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} else |
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printf("Kernel fails to open mq because defaults are " |
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"greater than maximums:\tFAIL\n"); |
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set(def_msgs, --cur_def_msgs); |
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set(def_msgsize, --cur_def_msgsize); |
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cur_limits.rlim_cur = cur_limits.rlim_max = cur_def_msgs * |
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cur_def_msgsize; |
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setr(RLIMIT_MSGQUEUE, &cur_limits); |
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if (test_queue_fail(NULL, &result)) |
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printf("Kernel creates queue even though defaults " |
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"would exceed\nrlimit setting:" |
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"\t\t\t\t\t\t\t\tFAIL\n"); |
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else |
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printf("Kernel properly fails to create queue when " |
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"defaults would\nexceed rlimit:" |
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"\t\t\t\t\t\t\t\tPASS\n"); |
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} |
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/* |
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* Test #2 - open with an attr struct that exceeds rlimit |
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*/ |
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printf("\n\nTest series 2, behavior when attr struct is " |
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"passed to mq_open:\n"); |
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cur_max_msgs = 32; |
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cur_max_msgsize = cur_limits.rlim_max >> 4; |
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set(max_msgs, cur_max_msgs); |
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set(max_msgsize, cur_max_msgsize); |
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attr.mq_maxmsg = cur_max_msgs; |
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attr.mq_msgsize = cur_max_msgsize; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open in excess of rlimit max when euid = 0 " |
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"succeeded:\t\tFAIL\n"); |
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else |
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printf("Queue open in excess of rlimit max when euid = 0 " |
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"failed:\t\tPASS\n"); |
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attr.mq_maxmsg = cur_max_msgs + 1; |
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attr.mq_msgsize = 10; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open with mq_maxmsg > limit when euid = 0 " |
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"succeeded:\t\tPASS\n"); |
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else |
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printf("Queue open with mq_maxmsg > limit when euid = 0 " |
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"failed:\t\tFAIL\n"); |
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attr.mq_maxmsg = 1; |
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attr.mq_msgsize = cur_max_msgsize + 1; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open with mq_msgsize > limit when euid = 0 " |
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"succeeded:\t\tPASS\n"); |
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else |
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printf("Queue open with mq_msgsize > limit when euid = 0 " |
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"failed:\t\tFAIL\n"); |
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attr.mq_maxmsg = 65536; |
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attr.mq_msgsize = 65536; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open with total size > 2GB when euid = 0 " |
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"succeeded:\t\tFAIL\n"); |
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else |
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printf("Queue open with total size > 2GB when euid = 0 " |
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"failed:\t\t\tPASS\n"); |
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if (seteuid(99) == -1) { |
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perror("seteuid() failed"); |
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exit(1); |
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} |
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attr.mq_maxmsg = cur_max_msgs; |
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attr.mq_msgsize = cur_max_msgsize; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open in excess of rlimit max when euid = 99 " |
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"succeeded:\t\tFAIL\n"); |
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else |
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printf("Queue open in excess of rlimit max when euid = 99 " |
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"failed:\t\tPASS\n"); |
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attr.mq_maxmsg = cur_max_msgs + 1; |
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attr.mq_msgsize = 10; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open with mq_maxmsg > limit when euid = 99 " |
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"succeeded:\t\tFAIL\n"); |
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else |
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printf("Queue open with mq_maxmsg > limit when euid = 99 " |
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"failed:\t\tPASS\n"); |
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attr.mq_maxmsg = 1; |
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attr.mq_msgsize = cur_max_msgsize + 1; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open with mq_msgsize > limit when euid = 99 " |
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"succeeded:\t\tFAIL\n"); |
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else |
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printf("Queue open with mq_msgsize > limit when euid = 99 " |
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"failed:\t\tPASS\n"); |
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attr.mq_maxmsg = 65536; |
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attr.mq_msgsize = 65536; |
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if (test_queue_fail(&attr, &result)) |
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printf("Queue open with total size > 2GB when euid = 99 " |
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"succeeded:\t\tFAIL\n"); |
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else |
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printf("Queue open with total size > 2GB when euid = 99 " |
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"failed:\t\t\tPASS\n"); |
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shutdown(0,"",0); |
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}
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