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xen.b9daff9d811285f1e40669bc621c2241793f7a95.patch
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File xen.b9daff9d811285f1e40669bc621c2241793f7a95.patch of Package xen
From: Chris Patterson <pattersonc@ainfosec.com> Date: Fri, 3 Jun 2016 12:50:09 -0400 Subject: b9daff9d811285f1e40669bc621c2241793f7a95 libxl: replace deprecated readdir_r() with readdir() Replace the usage of readdir_r() with readdir() to address a compilation error under glibc due to the deprecation of readdir_r for their next release (2.24) [1, 2]. Remove code specific to usage of readdir_r which is no longer required, such as zalloc_dirent(). -- From the GNU libc manual [3]: " It is expected that future versions of POSIX will obsolete readdir_r and mandate the level of thread safety for readdir which is provided by the GNU C Library and other implementations today. " There is a filed bug in the Austin Group Defect Tracker [4] in which 'dalias' proposes (in comment 0001632) that: " I would like to propose an alternate solution. For readdir, replace the text: "The readdir() function need not be thread-safe." with: "If multiple threads call the readdir() function with the same directory stream argument and without synchronization to preclude simultaneous access, then the behavior is undefined." With this change, the clunky readdir_r function is no longer needed or useful, and should probably be deprecated. As the only reasonable way to meet the implementation requirements for readdir is to have the dirent buffer in the DIR structure, this change should not require any change to existing implementations. " [1] https://sourceware.org/ml/libc-alpha/2016-02/msg00093.html [2] https://sourceware.org/bugzilla/show_bug.cgi?id=19056 [3] https://www.gnu.org/software/libc/manual/html_node/Reading_002fClosing-Directory.html [4] http://austingroupbugs.net/view.php?id=696 Signed-off-by: Chris Patterson <pattersonc@ainfosec.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Release-acked-by: Wei Liu <wei.liu2@citrix.com> --- tools/libxl/libxl_utils.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) --- a/tools/libxl/libxl_utils.c +++ b/tools/libxl/libxl_utils.c @@ -462,32 +462,30 @@ int libxl__remove_directory(libxl__gc *gc, const char *dirpath) DIR *d = 0; d = opendir(dirpath); if (!d) { if (errno == ENOENT) goto out; LOGE(ERROR, "failed to opendir %s for removal", dirpath); rc = ERROR_FAIL; goto out; } - size_t need = offsetof(struct dirent, d_name) + - pathconf(dirpath, _PC_NAME_MAX) + 1; - struct dirent *de_buf = libxl__zalloc(gc, need); struct dirent *de; for (;;) { - int r = readdir_r(d, de_buf, &de); - if (r) { + errno = 0; + de = readdir(d); + if (!de && errno) { LOGE(ERROR, "failed to readdir %s for removal", dirpath); rc = ERROR_FAIL; break; } if (!de) break; if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) continue; const char *subpath = GCSPRINTF("%s/%s", dirpath, de->d_name);
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