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Message-ID: <CAGMVOdtX2pw9CeOEmgcqv65zX8q5bC+K5tA8XtHS2X9Zr5wkUA@mail.gmail.com>
Date: Fri, 13 May 2022 22:39:17 +0100
From: Oliver Ford <ojford@...il.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH musl v2 3/3] mntent: fix parsing lines with
optional fields
On Thu, May 12, 2022 at 10:10 PM Rich Felker <dalias@...c.org> wrote:
> This fails to check that the match is at the start of an option
> (preceded by a ',' or at the beginning of string) and fails to
> continue if the first match is a false positive (e.g. "ro" in
> "symlinkroot,ro"). It's possible to solve this still using strstr in a
> loop, but it might be easier to just iterate delimiters and strcmp.
>
> Also, I'm not sure if hasmntopt is supposed to return a match or not
> for something like "uid" in "uid=1001"; if so, being followed by '='
> also needs to be considered valid match.
>
> Rich
Comparing glibc and bionic, they both match when followed by an '='.
So the below function handles that, and replaces strstr with an
strncmp and a loop. If this version is ok I'll submit a patch?
char *hasmntopt(const struct mntent *mnt, const char *opt)
{
char *ptr = mnt->mnt_opts;
size_t len = strlen(opt);
while (ptr) {
char *end = ptr + len;
if (!strncmp(ptr, opt, len) &&
(*end == '\0' || *end == ',' || *end == '=')) return ptr;
ptr = strchr(ptr, ',');
if (ptr) ptr++;
}
return NULL;
}
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