From 638a23483b40c5b606ee323e6612e7e454e5154b Mon Sep 17 00:00:00 2001 From: "Anthony G. Basile" Date: Mon, 27 Oct 2014 16:13:34 -0400 Subject: mkostemp: fix implementation mkostemp(char *template, int flags) generates a unique temporary filename from a template. The flags parameter accepts three of the same flags as open(2): O_APPEND, O_CLOEXEC, and O_SYNC. The current implementation of mkostemp(3) does not respect the flags and in fact confuses the flags with the file mode which should always be S_IRUSR | S_IWUSR. This patch corrects this issue. Signed-off-by: Anthony G. Basile Signed-off-by: Bernhard Reutner-Fischer index b61d69c..168adb1 100644 --- libc/inet/getaddrinfo.c +++ libc/inet/getaddrinfo.c @@ -310,7 +310,7 @@ char *buf = ((struct sockaddr_un *)ai->ai_addr)->sun_path; if (__path_search(buf, L_tmpnam, NULL, NULL, 0) != 0 - || __gen_tempname(buf, __GT_NOCREATE, 0) != 0 + || __gen_tempname(buf, __GT_NOCREATE, 0, 0) != 0 ) { return -EAI_SYSTEM; } index 18fd823..edcc31c 100644 --- libc/misc/internals/tempname.c +++ libc/misc/internals/tempname.c @@ -178,7 +178,7 @@ __GT_DIR: create a directory with given mode. */ -int attribute_hidden __gen_tempname (char *tmpl, int kind, mode_t mode) +int attribute_hidden __gen_tempname (char *tmpl, int kind, int flags, mode_t mode) { char *XXXXXX; unsigned int i; @@ -220,11 +220,11 @@ fd = 0; } case __GT_FILE: - fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, mode); + fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL | flags, mode); break; #if defined __UCLIBC_HAS_LFS__ case __GT_BIGFILE: - fd = open64 (tmpl, O_RDWR | O_CREAT | O_EXCL, mode); + fd = open64 (tmpl, O_RDWR | O_CREAT | O_EXCL | flags, mode); break; #endif case __GT_DIR: index e75b632..edfe26d 100644 --- libc/misc/internals/tempname.h +++ libc/misc/internals/tempname.h @@ -10,7 +10,7 @@ const char *pfx /*, int try_tmpdir */) attribute_hidden; #define __path_search(tmpl, tmpl_len, dir, pfx, try_tmpdir) ___path_search(tmpl, tmpl_len, dir, pfx) -extern int __gen_tempname (char *__tmpl, int __kind, mode_t mode) attribute_hidden; +extern int __gen_tempname (char *__tmpl, int __kind, int flags, mode_t mode) attribute_hidden; /* The __kind argument to __gen_tempname may be one of: */ #define __GT_FILE 0 /* create a file */ index 232ed02..74bb26e 100644 --- libc/stdio/tempnam.c +++ libc/stdio/tempnam.c @@ -36,7 +36,7 @@ if (__path_search (buf, FILENAME_MAX, dir, pfx, 1)) return NULL; - if (__gen_tempname (buf, __GT_NOCREATE, 0)) + if (__gen_tempname (buf, __GT_NOCREATE, 0, 0)) return NULL; return strdup (buf); index a9bf474..83c85b5 100644 --- libc/stdio/tmpfile.c +++ libc/stdio/tmpfile.c @@ -36,7 +36,7 @@ if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0)) return NULL; - fd = __gen_tempname (buf, __GT_FILE, S_IRUSR | S_IWUSR); + fd = __gen_tempname (buf, __GT_FILE, 0, S_IRUSR | S_IWUSR); if (fd < 0) return NULL; index 88b9bff..ffed862 100644 --- libc/stdio/tmpnam.c +++ libc/stdio/tmpnam.c @@ -41,7 +41,7 @@ 0)) return NULL; - if (__builtin_expect (__gen_tempname (tmpbuf, __GT_NOCREATE, 0), 0)) + if (__builtin_expect (__gen_tempname (tmpbuf, __GT_NOCREATE, 0, 0), 0)) return NULL; if (s == NULL) index 8cde84d..bfd60a4 100644 --- libc/stdio/tmpnam_r.c +++ libc/stdio/tmpnam_r.c @@ -28,7 +28,7 @@ if (__path_search (s, L_tmpnam, NULL, NULL, 0)) return NULL; - if (__gen_tempname (s, __GT_NOCREATE, 0)) + if (__gen_tempname (s, __GT_NOCREATE, 0, 0)) return NULL; return s; index da7598a..e6d4a36 100644 --- libc/stdlib/mkdtemp.c +++ libc/stdlib/mkdtemp.c @@ -30,7 +30,7 @@ (This function comes from OpenBSD.) */ char * mkdtemp (char *template) { - if (__gen_tempname (template, __GT_DIR, S_IRUSR | S_IWUSR | S_IXUSR)) + if (__gen_tempname (template, __GT_DIR, 0, S_IRUSR | S_IWUSR | S_IXUSR)) return NULL; else return template; index 0369235..912be30 100644 --- libc/stdlib/mkostemp.c +++ libc/stdlib/mkostemp.c @@ -17,6 +17,7 @@ #include #include +#include #include "../misc/internals/tempname.h" /* Generate a unique temporary file name from TEMPLATE. @@ -26,5 +27,6 @@ int mkostemp (char *template, int flags) { - return __gen_tempname (template, __GT_FILE, flags); + flags -= flags & O_ACCMODE; /* Remove O_RDONLY, O_WRONLY, and O_RDWR. */ + return __gen_tempname (template, __GT_FILE, flags, S_IRUSR | S_IWUSR); } index d21def5..c6d6d84 100644 --- libc/stdlib/mkostemp64.c +++ libc/stdlib/mkostemp64.c @@ -27,5 +27,5 @@ int mkostemp64 (char *template, int flags) { - return __gen_tempname (template, __GT_BIGFILE, flags | O_LARGEFILE); + return __gen_tempname (template, __GT_BIGFILE, flags | O_LARGEFILE, S_IRUSR | S_IWUSR | S_IXUSR); } index 61c7175..a3a1595 100644 --- libc/stdlib/mkstemp.c +++ libc/stdlib/mkstemp.c @@ -27,5 +27,5 @@ Then open the file and return a fd. */ int mkstemp (char *template) { - return __gen_tempname (template, __GT_FILE, S_IRUSR | S_IWUSR); + return __gen_tempname (template, __GT_FILE, 0, S_IRUSR | S_IWUSR); } index e29be2d..6f2ee3e 100644 --- libc/stdlib/mkstemp64.c +++ libc/stdlib/mkstemp64.c @@ -27,5 +27,5 @@ Then open the file and return a fd. */ int mkstemp64 (char *template) { - return __gen_tempname (template, __GT_BIGFILE, S_IRUSR | S_IWUSR); + return __gen_tempname (template, __GT_BIGFILE, 0, S_IRUSR | S_IWUSR); } index edd001d..1ff93da 100644 --- libc/stdlib/mktemp.c +++ libc/stdlib/mktemp.c @@ -25,7 +25,7 @@ * they are replaced with a string that makes the filename unique. */ char *mktemp(char *template) { - if (__gen_tempname (template, __GT_NOCREATE, 0) < 0) + if (__gen_tempname (template, __GT_NOCREATE, 0, 0) < 0) /* We return the null string if we can't find a unique file name. */ template[0] = '\0'; index 1b36164..3a72079 100644 --- libpthread/nptl/sem_open.c +++ libpthread/nptl/sem_open.c @@ -337,7 +337,7 @@ mempcpy (mempcpy (tmpfname, mountpoint.dir, mountpoint.dirlen), "XXXXXX", 7); - fd = __gen_tempname (tmpfname, __GT_FILE, mode); + fd = __gen_tempname (tmpfname, __GT_FILE, 0, mode); if (fd == -1) return SEM_FAILED; index 8f32031..5944f0a 100644 --- test/.gitignore +++ test/.gitignore @@ -257,6 +257,8 @@ stdlib/testatexit stdlib/test-canon stdlib/test-canon2 +stdlib/test-mkostemp-O_CLOEXEC +stdlib/test-mkostemp-child stdlib/teston_exit stdlib/teststrtol stdlib/teststrtoq new file mode 100644 index 0000000..9ff229a --- /dev/null +++ test/stdlib/test-mkostemp-O_CLOEXEC.c @@ -0,0 +1,45 @@ +#define _XOPEN_SOURCE_EXTENDED +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if !defined __ARCH_USE_MMU__ +# define fork vfork +#endif + +int main(int argc, char *argv[]) { + int fd, status; + char buff[5]; + char template[] = "/tmp/test-mkostemp.XXXXXX"; + + fd = mkostemp(template, O_CLOEXEC); + unlink(template); + + snprintf(buff, 5, "%d", fd); + + if(!fork()) + if(execl("./test-mkostemp-child", "test-mkostemp-child", buff, NULL) == -1) + exit(EXIT_FAILURE); + + wait(&status); + + memset(buff, 0, 5); + lseek(fd, 0, SEEK_SET); + errno = 0; + if(read(fd, buff, 5) == -1) + exit(EXIT_FAILURE); + + if(!strncmp(buff, "test", 5)) + exit(EXIT_FAILURE); + else + exit(EXIT_SUCCESS); + + close(fd); + exit(EXIT_SUCCESS); +} new file mode 100644 index 0000000..708bd80 --- /dev/null +++ test/stdlib/test-mkostemp-child.c @@ -0,0 +1,22 @@ +#include +#include +#include + +int main(int argc, char *argv[]) { + int fd; + + /* This file gets built and run as a test, but its + * really just a helper for test-mkostemp-O_CLOEXEC.c. + * So, we'll always return succcess. + */ + if(argc != 2) + exit(EXIT_SUCCESS); + + sscanf(argv[1], "%d", &fd); + + if(write(fd, "test\0", 5) == -1) + ; /* Don't Panic! Failure is okay here. */ + + close(fd); + exit(EXIT_SUCCESS); +}