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Import mntent bug fixes from Musl Libc

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f314e133929b6379eccc632bef32eaebb66a7335
Author: Rich Felker <dalias@aerifal.cx>
Date:   Thu Nov 16 12:55:21 2023 -0500

    mntent: fields are delimited only by tabs or spaces, not general whitespace

    this matters because the kernel-provided mtab only escapes tabs,
    spaces, newlines, and backslashes. it leaves carriage returns, form
    feeds, and vertical tabs literal.

commit ee1d39bc1573c1ae49ee6b658938b56bbef95a6c
Author: q66 <q66@chimera-linux.org>
Date:   Thu Nov 9 20:48:44 2023 +0100

    mntent: unescape octal sequences

    As entries in mtab are delimited by spaces, whitespace characters
    are escaped as octal sequences. When reading them out, we have to
    unescape these sequences to get the proper string.
This commit is contained in:
Justine Tunney 2024-04-23 09:29:56 -07:00
parent 9e848abad9
commit 1a6b4ab627
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
1 changed files with 41 additions and 5 deletions
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46
third_party/musl/mntent.c vendored
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@ -49,6 +49,42 @@ int endmntent(FILE *f)
return 1;
}
static char *unescape_ent(char *beg)
{
char *dest = beg;
const char *src = beg;
while (*src) {
const char *val;
unsigned char cval = 0;
if (*src != '\\') {
*dest++ = *src++;
continue;
}
if (src[1] == '\\') {
++src;
*dest++ = *src++;
continue;
}
val = src + 1;
for (int i = 0; i < 3; ++i) {
if (*val >= '0' && *val <= '7') {
cval <<= 3;
cval += *val++ - '0';
} else {
break;
}
}
if (cval) {
*dest++ = cval;
src = val;
} else {
*dest++ = *src++;
}
}
*dest = 0;
return beg;
}
struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
{
int n[8], use_internal = (linebuf == SENTINEL);
@ -74,7 +110,7 @@ struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int bufle
len = strlen(linebuf);
if (len > INT_MAX) continue;
for (i = 0; i < sizeof n / sizeof *n; i++) n[i] = len;
sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
sscanf(linebuf, " %n%*[^ \t]%n %n%*[^ \t]%n %n%*[^ \t]%n %n%*[^ \t]%n %d %d",
n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
&mnt->mnt_freq, &mnt->mnt_passno);
} while (linebuf[n[0]] == '#' || n[1]==len);
@ -84,10 +120,10 @@ struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int bufle
linebuf[n[5]] = 0;
linebuf[n[7]] = 0;
mnt->mnt_fsname = linebuf+n[0];
mnt->mnt_dir = linebuf+n[2];
mnt->mnt_type = linebuf+n[4];
mnt->mnt_opts = linebuf+n[6];
mnt->mnt_fsname = unescape_ent(linebuf+n[0]);
mnt->mnt_dir = unescape_ent(linebuf+n[2]);
mnt->mnt_type = unescape_ent(linebuf+n[4]);
mnt->mnt_opts = unescape_ent(linebuf+n[6]);
return mnt;
}