mesg: use only stat() to get the current terminal status
open()+stat() does not work for example after su(1) (from root to non-root). It seems better to use only stat() to get the current terminal status. Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1906157 Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -139,13 +139,9 @@ int main(int argc, char *argv[])
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warnx(_("ttyname() failed, attempting to go around using: %s"), tty);
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}
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if ((fd = open(tty, O_RDONLY)) < 0)
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err(MESG_EXIT_FAILURE, _("cannot open %s"), tty);
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if (fstat(fd, &sb))
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err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty);
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if (!*argv) {
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close(fd);
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if (stat(tty, &sb))
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err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty);
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if (sb.st_mode & (S_IWGRP | S_IWOTH)) {
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puts(_("is y"));
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return IS_ALLOWED;
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@ -154,6 +150,11 @@ int main(int argc, char *argv[])
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return IS_NOT_ALLOWED;
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}
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if ((fd = open(tty, O_RDONLY)) < 0)
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err(MESG_EXIT_FAILURE, _("cannot open %s"), tty);
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if (fstat(fd, &sb))
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err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty);
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switch (rpmatch(argv[0])) {
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case RPMATCH_YES:
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#ifdef USE_TTY_GROUP
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