devel October 2020

devel@uclibc-ng.org

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3 discussions

[PATCH] misc: add test for hasmntopt() option matching
by yann＠sionneau.net 19 Oct '20

19 Oct '20

From: Yann Sionneau <yann(a)sionneau.net> Signed-off-by: Yann Sionneau <yann(a)sionneau.net> --- test/misc/tst-hasmntopt.c | 47 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 test/misc/tst-hasmntopt.c diff --git a/test/misc/tst-hasmntopt.c b/test/misc/tst-hasmntopt.c new file mode 100644 index 0000000..17655bd --- /dev/null +++ b/test/misc/tst-hasmntopt.c @@ -0,0 +1,47 @@ +/* Copyright (C) 2020 by Yann Sionneau <yann(a)sionneau.net> */ + +#include <stdio.h> +#include <mntent.h> +#include <stdlib.h> +#include <string.h> + +static int +do_test (void) +{ + char *res; + struct mntent m; + + /* check that "ro" does not match "erROr" */ + m.mnt_opts = "error"; + res = hasmntopt (&m, MNTOPT_RO); + if (res != NULL) { + puts ("error: hasmntopt() picked up non existing option"); + exit (1); + } + + /* check that "ro" does not match "remount-ro" */ + m.mnt_opts = "rw,relatime,errors=remount-ro"; + res = hasmntopt (&m, MNTOPT_RO); + if (res != NULL) { + puts ("error: hasmntopt() picked up non existing option"); + exit (1); + } + + /* check that "ro" does match "ro" */ + m.mnt_opts = "noatime,ro"; + res = hasmntopt (&m, MNTOPT_RO); + if (res == NULL) { + puts ("error: hasmntopt() did not pick up an existing option"); + exit (1); + } + + if (strncmp(res, "ro", 2) != 0) { + puts ("error: hasmntopt() did not return a pointer to corresponding option"); + exit (1); + } + + return 0; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" -- 2.25.1

2 1

[PATCH] hasmntopt: better option matching
by yann＠sionneau.net 19 Oct '20

19 Oct '20

From: Yann Sionneau <yann(a)sionneau.net> Previous implementation was respecting the man page description of what the function should do. Also the function does not seem to be defined by POSIX. But... to be really useful the function needs to handle option matching and not just substring matching. This is copy pasted from glibc. This fixes issue reported by https://github.com/wbx-github/uclibc-ng/issues/8 that can happen for instance there: https://github.com/frida/glib/blob/master/gio/gunixmounts.c#L622 Signed-off-by: Yann Sionneau <yann(a)sionneau.net> --- libc/misc/mntent/mntent.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/libc/misc/mntent/mntent.c b/libc/misc/mntent/mntent.c index 608f84c1a..610e35af6 100644 --- a/libc/misc/mntent/mntent.c +++ b/libc/misc/mntent/mntent.c @@ -1,5 +1,6 @@ /* * Copyright (C) 2000-2006 Erik Andersen <andersen(a)uclibc.org> + * Copyright (C) 1995-2020 Free Software Foundation, Inc. * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ @@ -92,9 +93,25 @@ int addmntent(FILE * filep, const struct mntent *mnt) mnt->mnt_type, mnt->mnt_opts, mnt->mnt_freq, mnt->mnt_passno) < 0 ? 1 : 0); } -char *hasmntopt(const struct mntent *mnt, const char *opt) +/* Search MNT->mnt_opts for an option matching OPT. + Returns the address of the substring, or null if none found. */ +char *hasmntopt (const struct mntent *mnt, const char *opt) { - return strstr(mnt->mnt_opts, opt); + const size_t optlen = strlen(opt); + char *rest = mnt->mnt_opts, *p; + + while ((p = strstr(rest, opt)) != NULL) { + if ((p == rest || p[-1] == ',') + && (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ',')) + return p; + + rest = strchr(p, ','); + if (rest == NULL) + break; + ++rest; + } + + return NULL; } FILE *setmntent(const char *name, const char *mode) -- 2.25.1

2 1

New release
by Petr Vorel 02 Oct '20

02 Oct '20

Hi Waldemar, sorry to be impatient, but would you mind to create release to help distros not backporting all the fixes? Kind regards, Petr

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devel October 2020