X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=arch%2Fum%2Fos-Linux%2Fmem.c;h=93a11d7edfa0505a7acfd9bd99a0266aec97f933;hb=3787fa6df5bb6e80b274ff805e10b6a9bfc4588c;hp=b170b4704dc40aa25137f6ab29ece4b36eb03078;hpb=91b165c0594ab78c64f26d26e3174e6dfd60ed9d;p=safe%2Fjmp%2Flinux-2.6 diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c index b170b47..93a11d7 100644 --- a/arch/um/os-Linux/mem.c +++ b/arch/um/os-Linux/mem.c @@ -1,45 +1,50 @@ +/* + * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + * Licensed under the GPL + */ + #include -#include #include -#include +#include #include #include -#include #include -#include +#include #include -#include -#include "kern_util.h" -#include "user.h" -#include "user_util.h" -#include "mem_user.h" +#include #include "init.h" -#include "os.h" -#include "tempfile.h" #include "kern_constants.h" +#include "os.h" +#include "user.h" -#include - +/* Modified by which_tmpdir, which is called during early boot */ static char *default_tmpdir = "/tmp"; + +/* + * Modified when creating the physical memory file and when checking + * the tmp filesystem for usability, both happening during early boot. + */ static char *tempdir = NULL; static void __init find_tempdir(void) { - char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL }; + const char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL }; int i; char *dir = NULL; - if(tempdir != NULL) return; /* We've already been called */ - for(i = 0; dirs[i]; i++){ + if (tempdir != NULL) + /* We've already been called */ + return; + for (i = 0; dirs[i]; i++) { dir = getenv(dirs[i]); - if((dir != NULL) && (*dir != '\0')) + if ((dir != NULL) && (*dir != '\0')) break; } - if((dir == NULL) || (*dir == '\0')) + if ((dir == NULL) || (*dir == '\0')) dir = default_tmpdir; tempdir = malloc(strlen(dir) + 2); - if(tempdir == NULL){ + if (tempdir == NULL) { fprintf(stderr, "Failed to malloc tempdir, " "errno = %d\n", errno); return; @@ -48,21 +53,23 @@ static void __init find_tempdir(void) strcat(tempdir, "/"); } -/* This will return 1, with the first character in buf being the +/* + * This will return 1, with the first character in buf being the * character following the next instance of c in the file. This will * read the file as needed. If there's an error, -errno is returned; * if the end of the file is reached, 0 is returned. */ -static int next(int fd, char *buf, int size, char c) +static int next(int fd, char *buf, size_t size, char c) { - int n, len; + ssize_t n; + size_t len; char *ptr; - while((ptr = strchr(buf, c)) == NULL){ + while ((ptr = strchr(buf, c)) == NULL) { n = read(fd, buf, size - 1); - if(n == 0) + if (n == 0) return 0; - else if(n < 0) + else if (n < 0) return -errno; buf[n] = '\0'; @@ -72,20 +79,23 @@ static int next(int fd, char *buf, int size, char c) len = strlen(ptr); memmove(buf, ptr, len + 1); - /* Refill the buffer so that if there's a partial string that we care + /* + * Refill the buffer so that if there's a partial string that we care * about, it will be completed, and we can recognize it. */ n = read(fd, &buf[len], size - len - 1); - if(n < 0) + if (n < 0) return -errno; buf[len + n] = '\0'; return 1; } +/* which_tmpdir is called only during early boot */ static int checked_tmpdir = 0; -/* Look for a tmpfs mounted at /dev/shm. I couldn't find a cleaner +/* + * Look for a tmpfs mounted at /dev/shm. I couldn't find a cleaner * way to do this than to parse /proc/mounts. statfs will return the * same filesystem magic number and fs id for both /dev and /dev/shm * when they are both tmpfs, so you can't tell if they are different @@ -100,7 +110,7 @@ static void which_tmpdir(void) int fd, found; char buf[128] = { '\0' }; - if(checked_tmpdir) + if (checked_tmpdir) return; checked_tmpdir = 1; @@ -108,81 +118,85 @@ static void which_tmpdir(void) printf("Checking for tmpfs mount on /dev/shm..."); fd = open("/proc/mounts", O_RDONLY); - if(fd < 0){ + if (fd < 0) { printf("failed to open /proc/mounts, errno = %d\n", errno); return; } - while(1){ + while (1) { found = next(fd, buf, ARRAY_SIZE(buf), ' '); - if(found != 1) + if (found != 1) break; - if(!strncmp(buf, "/dev/shm", strlen("/dev/shm"))) + if (!strncmp(buf, "/dev/shm", strlen("/dev/shm"))) goto found; found = next(fd, buf, ARRAY_SIZE(buf), '\n'); - if(found != 1) + if (found != 1) break; } err: - if(found == 0) + if (found == 0) printf("nothing mounted on /dev/shm\n"); - else if(found < 0) + else if (found < 0) printf("read returned errno %d\n", -found); +out: + close(fd); + return; found: found = next(fd, buf, ARRAY_SIZE(buf), ' '); - if(found != 1) + if (found != 1) goto err; - if(strncmp(buf, "tmpfs", strlen("tmpfs"))){ + if (strncmp(buf, "tmpfs", strlen("tmpfs"))) { printf("not tmpfs\n"); - return; + goto out; } printf("OK\n"); default_tmpdir = "/dev/shm"; + goto out; } -/* - * This proc still used in tt-mode - * (file: kernel/tt/ptproxy/proxy.c, proc: start_debugger). - * So it isn't 'static' yet. - */ -int make_tempfile(const char *template, char **out_tempname, int do_unlink) +static int __init make_tempfile(const char *template, char **out_tempname, + int do_unlink) { char *tempname; int fd; which_tmpdir(); tempname = malloc(MAXPATHLEN); + if (tempname == NULL) + return -1; find_tempdir(); + if ((tempdir == NULL) || (strlen(tempdir) >= MAXPATHLEN)) + return -1; + if (template[0] != '/') strcpy(tempname, tempdir); else tempname[0] = '\0'; - strcat(tempname, template); + strncat(tempname, template, MAXPATHLEN-1-strlen(tempname)); fd = mkstemp(tempname); - if(fd < 0){ + if (fd < 0) { fprintf(stderr, "open - cannot create %s: %s\n", tempname, strerror(errno)); goto out; } - if(do_unlink && (unlink(tempname) < 0)){ + if (do_unlink && (unlink(tempname) < 0)) { perror("unlink"); goto out; } - if(out_tempname){ + if (out_tempname) { *out_tempname = tempname; - } else { + } else free(tempname); - } - return(fd); + return fd; out: free(tempname); return -1; @@ -190,62 +204,57 @@ out: #define TEMPNAME_TEMPLATE "vm_file-XXXXXX" -/* - * This proc is used in start_up.c - * So it isn't 'static'. - */ -int create_tmp_file(unsigned long long len) +static int __init create_tmp_file(unsigned long long len) { int fd, err; char zero; fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1); - if(fd < 0) { + if (fd < 0) exit(1); - } err = fchmod(fd, 0777); - if(err < 0){ - perror("os_mode_fd"); + if (err < 0) { + perror("fchmod"); exit(1); } - /* Seek to len - 1 because writing a character there will + /* + * Seek to len - 1 because writing a character there will * increase the file size by one byte, to the desired length. */ if (lseek64(fd, len - 1, SEEK_SET) < 0) { - perror("os_seek_file"); + perror("lseek64"); exit(1); } zero = 0; - err = os_write_file(fd, &zero, 1); - if(err != 1){ - errno = -err; - perror("os_write_file"); + err = write(fd, &zero, 1); + if (err != 1) { + perror("write"); exit(1); } - return(fd); + return fd; } -int create_mem_file(unsigned long long len) +int __init create_mem_file(unsigned long long len) { int err, fd; fd = create_tmp_file(len); - err = os_set_exec_close(fd, 1); - if(err < 0){ + err = os_set_exec_close(fd); + if (err < 0) { errno = -err; perror("exec_close"); } - return(fd); + return fd; } -void check_tmpexec(void) +void __init check_tmpexec(void) { void *addr; int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE); @@ -254,10 +263,11 @@ void check_tmpexec(void) PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0); printf("Checking PROT_EXEC mmap in %s...",tempdir); fflush(stdout); - if(addr == MAP_FAILED){ + if (addr == MAP_FAILED) { err = errno; perror("failed"); - if(err == EPERM) + close(fd); + if (err == EPERM) printf("%s must be not mounted noexec\n",tempdir); exit(1); }