source: tests/meta/dumpable.cfa @ fa5e1aa5

//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// dumpable.cfa -- Check if everything looks correctly set to dump core
//
// Author           : Thierry Delisle
// Created On       : Wed Jan 05 13:53:22 2022
// Last Modified By :
// Last Modified On :
// Update Count     :
//

#include <errno.h>
#include <limits.h>
#include <string.h>

#include <fstream.hfa>

extern "C" {
        #include <fcntl.h>
        #include <unistd.h>
        #include <sys/prctl.h>
        #include <sys/resource.h>
        #include <sys/statvfs.h>
        #include <sys/stat.h>
        #include <sys/types.h>
}

void check_ulimit() {
        struct rlimit rlp;
        getrlimit(RLIMIT_CORE, &rlp);
        if(rlp.rlim_cur < 536870912) {
                serr | "Soft core limit is less than ~500Mb: " | rlp.rlim_cur;
        }

        if(rlp.rlim_max < 536870912) {
                serr | "Hard core limit is less than ~500Mb: " | rlp.rlim_max;
        }
}

void check_permission() {
        {
                char myExe[PATH_MAX];
                ssize_t n = readlink("/proc/self/exe", myExe, sizeof(myExe));
                if (n < 0) {
                        perror("readlink(/proc/self/exe) error");
                        return 1;
                }
                myExe[n] = '\0';

                if(int r = access(myExe, F_OK); r != 0) serr | "Expected current executable does not exist!" | r | errno;
                if(int r = access(myExe, R_OK); r != 0) serr | "No read access for current executable" | r | errno;
        }

        {
                char myCwd[PATH_MAX];
                if (getcwd(myCwd, sizeof(myCwd)) == 0p) {
                        perror("getcwd() error");
                        return;
                }

                if(access(myCwd, F_OK) != 0) serr | "Expected current working directory does not exist!";
                if(access(myCwd, R_OK) != 0) serr | "No read access for current working directory";
                if(access(myCwd, W_OK) != 0) serr | "No write access for current working directory";
        }
}

void check_free_space() {
        struct statvfs buf;
        if(statvfs(".", &buf) != 0) {
                perror("statvfs() error");
                return;
        }

        uint64_t avail = buf.f_bavail;
        avail *= buf.f_bsize;
        if(avail < 536870912_l64u) {
                serr | "Available diskspace is less than ~500Mb: " | avail;
        }

        if(buf.f_favail < 10) {
                serr | "Available inodes is less than 10: " | buf.f_favail;
        }

        if(buf.f_flag & ST_RDONLY) {
                serr | "Filesystem is read only";
        }
}

void check_noconflict() {
        char * name = "./core";
        if(access("./core", F_OK) == 0) serr | "A file of the core name ('" | name | "') already exists";
}

void check_dumpflag() {
        int r = prctl(PR_GET_DUMPABLE, 0, 0, 0, 0);
        if(r < 0) {
                perror("prctl(PR_GET_DUMPABLE) error");
                return;
        }

        if(r != 1) serr | "dumpable attribute not set to 1 \"(SUID_DUMP_USER, process is dumpable)\", was" | r;
}

void check_core_pattern() {
        int ret;
        int cp = open("/proc/sys/kernel/core_pattern", 0, O_RDONLY);
        if(cp < 0) {
                perror("open(/proc/sys/kernel/core_pattern, O_RDONLY) error");
                return;
        }

        try {
                const char * expected = "core\n";
                const int sz = sizeof("core\n");
                char buf[512];
                ret = read(cp, buf, 512);
                if(ret < 0) {
                        perror("first core pattern read error");
                        return;
                }
                ret = strncmp(expected, buf, sz - 1);
                if(ret != 0) {
                        serr | "/proc/sys/kernel/core_pattern does not contain 'core', was:" | nl | nl | buf | nl
                             | "Test script expect cores files to be dumped with name 'core' in current working directory." | nl
                             | "Apport is not supported, it should be deactivated in /etc/default/apport for the test suite to work with core dumps.";

                        return;
                }
        }
        finally {
                ret = close(cp);
                if(ret < 0) perror("close(/proc/sys/kernel/core_pattern) error");
        }

}

int main() {
        check_ulimit();

        check_permission();

        check_free_space();

        check_noconflict();

        check_dumpflag();

        check_core_pattern();

        sout | "Done";
}