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Cygwin: /proc/<PID>/mount*: escape strings.

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In order for these formats to be machine-parseable, characters used as
delimiters must be escaped.  Linux escapes space, tab, newline,
backslash, and hash (because code that parses mounts/mtab and fstab
would handle comments) using octal escapes.  Replicate that behavior
here.

Addresses: https://cygwin.com/pipermail/cygwin/2024-June/256082.html
Signed-off-by: Jeremy Drake <cygwin@jdrake.com>
This commit is contained in:
Jeremy Drake via Cygwin-patches 2024-06-04 19:04:22 -07:00 committed by Corinna Vinschen
parent 5a706ff0fc
commit 0d113da235
1 changed files with 66 additions and 10 deletions
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76
winsup/cygwin/fhandler/process.cc
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@ -1337,9 +1337,39 @@ extern "C" {
struct mntent *getmntent (FILE *);
};
static size_t
escape_string_length (const char *str, const char *escapees)
{
size_t i, len = 0;
for (i = strcspn (str, escapees);
str[i];
i += strcspn (str + i + 1, escapees) + 1)
len += 3;
return len + i;
}
static size_t
escape_string (char *destbuf, const char *str, const char *escapees)
{
size_t s, i;
char *p = destbuf;
for (s = 0, i = strcspn (str, escapees);
str[i];
s = i + 1, i += strcspn (str + s, escapees) + 1)
{
p = stpncpy (p, str + s, i - s);
p += __small_sprintf (p, "\\%03o", (int)(unsigned char) str[i]);
}
p = stpcpy (p, str + s);
return (p - destbuf);
}
static off_t
format_process_mountstuff (void *data, char *&destbuf, bool mountinfo)
{
static const char MOUNTSTUFF_ESCAPEES[] = " \t\n\\#";
_pinfo *p = (_pinfo *) data;
user_info *u_shared = NULL;
HANDLE u_hdl = NULL;
@ -1389,9 +1419,9 @@ format_process_mountstuff (void *data, char *&destbuf, bool mountinfo)
continue;
}
destbuf = (char *) crealloc_abort (destbuf, len
+ strlen (mnt->mnt_fsname)
+ strlen (mnt->mnt_dir)
+ strlen (mnt->mnt_type)
+ escape_string_length (mnt->mnt_fsname, MOUNTSTUFF_ESCAPEES)
+ escape_string_length (mnt->mnt_dir, MOUNTSTUFF_ESCAPEES)
+ escape_string_length (mnt->mnt_type, MOUNTSTUFF_ESCAPEES)
+ strlen (mnt->mnt_opts)
+ 30);
if (mountinfo)
@ -1400,18 +1430,44 @@ format_process_mountstuff (void *data, char *&destbuf, bool mountinfo)
dev_t dev = pc.exists () ? pc.fs_serial_number () : -1;
len += __small_sprintf (destbuf + len,
"%d %d %d:%d / %s %s - %s %s %s\n",
"%d %d %d:%d / ",
iteration, iteration,
major (dev), minor (dev),
mnt->mnt_dir, mnt->mnt_opts,
mnt->mnt_type, mnt->mnt_fsname,
major (dev), minor (dev));
len += escape_string (destbuf + len,
mnt->mnt_dir,
MOUNTSTUFF_ESCAPEES);
len += __small_sprintf (destbuf + len,
" %s - ",
mnt->mnt_opts);
len += escape_string (destbuf + len,
mnt->mnt_type,
MOUNTSTUFF_ESCAPEES);
destbuf[len++] = ' ';
len += escape_string (destbuf + len,
mnt->mnt_fsname,
MOUNTSTUFF_ESCAPEES);
len += __small_sprintf (destbuf + len,
" %s\n",
(pc.fs_flags () & FILE_READ_ONLY_VOLUME)
? "ro" : "rw");
}
else
len += __small_sprintf (destbuf + len, "%s %s %s %s %d %d\n",
mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type,
mnt->mnt_opts, mnt->mnt_freq, mnt->mnt_passno);
{
len += escape_string (destbuf + len,
mnt->mnt_fsname,
MOUNTSTUFF_ESCAPEES);
destbuf[len++] = ' ';
len += escape_string (destbuf + len,
mnt->mnt_dir,
MOUNTSTUFF_ESCAPEES);
destbuf[len++] = ' ';
len += escape_string (destbuf + len,
mnt->mnt_type,
MOUNTSTUFF_ESCAPEES);
len += __small_sprintf (destbuf + len, " %s %d %d\n",
mnt->mnt_opts, mnt->mnt_freq,
mnt->mnt_passno);
}
}
/* Restore available_drives */