#!/bin/sh # # SPDX-License-Identifier: BSD-2-Clause # # Copyright (c) 2019 Dell EMC Isilon # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # SUCH DAMAGE. # # Test scenario for "D20947: Check and avoid overflow when incrementing # fp->f_count in fget_unlocked() and fhold()". # OOM killing seen. Cap files and procs for now. . ../default.cfg dir=/tmp odir=`pwd` cd $dir rm -f /tmp/dup /tmp/dup.c || exit 1 sed '1,/^EOF/d' < $odir/$0 > $dir/dup.c mycc -o dup -Wall -Wextra dup.c || exit 1 rm -f dup.c cd $odir /tmp/dup; s=$? rm -f /tmp/dup exit $s EOF #include #include #include #include #include #include #include #include #include #include static volatile u_int *share; #define N 10240 #define CAP_FILES 50000 #define CAP_PROCS 1000 #define SYNC 0 int main(void) { struct stat st; pid_t pid[N]; size_t len; int fd, fd2, i, j, last; len = PAGE_SIZE; if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) err(1, "mmap"); if ((fd = open("/dev/zero", O_RDONLY)) == -1) err(1, "open(/dev/zero)"); i = 0; for (;;) { if ((fd2 = dup(fd)) == -1) { if (errno == EMFILE) break; err(1, "dup()"); } last = fd2; if (++i == CAP_FILES) break; } #if defined(DEBUG) fprintf(stderr, "i = %d\n", i); #endif for (i = 0; i < N; i++) { if ((pid[i] = fork()) == 0) { if (fstat(last, &st) == -1) err(1, "stat(%s)", "/dev/zero"); while(share[SYNC] == 0) usleep(100000); _exit(0); } if (pid[i] == -1) { warn("fork()"); i--; break; } if (i + 1 == CAP_PROCS) break; } share[SYNC] = 1; for (j = 0; j < i; j++) { if (waitpid(pid[j], NULL, 0) != pid[j]) err(1, "waitpid(%d), index %d", pid[j], j); } return (0); }