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proc-cmdline: allow backslash escapes when parsing /proc/cmdline

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So far when parsing /proc/cmdline we'd consider backslashes as
mechanisms for escaping whitepace or quotes. This changes things so that
they are retained as they are instead. The kernel itself doesn't allow such
escaping, and hence we shouldn't do so either (see lib/cmdline.c in the
kernel sources; it does support "" quotes btw).

This fix is useful to allow specifying backslash escapes in the "root="
cmdline option to be passed through to systemd-fstab-generator. Example:

    root=/dev/disk/by-partlabel/Root\x20Partition

Previously we'd eat up the "\" so that we'd then look for a device
/dev/disk/by-partlabel/Rootx20Partition which never shows up.
This commit is contained in:
Lennart Poettering 2021-04-06 11:45:47 +02:00
parent 29d898cc7b
commit d997861ea7
1 changed files with 1 additions and 1 deletions
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2
src/basic/proc-cmdline.c
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@ -47,7 +47,7 @@ static int proc_cmdline_extract_first(const char **p, char **ret_word, ProcCmdli
_cleanup_free_ char *word = NULL;
const char *c;
r = extract_first_word(&q, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX);
r = extract_first_word(&q, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX|EXTRACT_RETAIN_ESCAPE);
if (r < 0)
return r;
if (r == 0)