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fstab-generator: use 'usr' mapper device when 'usrhash' is present

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If 'usrhash' is present as a kernel command line parameter, use the usr
mapper device for usr mount
This commit is contained in:
Mark Boudreau 2021-11-09 20:07:26 -05:00
parent 78b408d2d9
commit c1b9e3dffe
No known key found for this signature in database
GPG Key ID: E769378F9AA6666D
1 changed files with 28 additions and 7 deletions
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35
src/fstab-generator/fstab-generator.c
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@ -50,6 +50,7 @@ static int arg_root_rw = -1;
static char *arg_usr_what = NULL;
static char *arg_usr_fstype = NULL;
static char *arg_usr_options = NULL;
static char *arg_usr_hash = NULL;
static VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID;
STATIC_DESTRUCTOR_REGISTER(arg_root_what, freep);
@ -59,6 +60,7 @@ STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_fstype, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_hash, freep);
static int write_options(FILE *f, const char *options) {
_cleanup_free_ char *o = NULL;
@ -969,6 +971,13 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
if (!strextend_with_separator(&arg_usr_options, ",", value))
return log_oom();
} else if (streq(key, "usrhash")) {
if (proc_cmdline_value_missing(key, value))
return 0;
return free_and_strdup_warn(&arg_usr_hash, value);
} else if (streq(key, "rw") && !value)
arg_root_rw = true;
else if (streq(key, "ro") && !value)
@ -997,24 +1006,35 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
return 0;
}
static int determine_root(void) {
/* If we have a root hash but no root device then Verity is used, and we use the "root" DM device as root. */
static int determine_device(char **what, const char *hash, const char *name) {
if (arg_root_what)
assert(what);
assert(name);
/* If we have a hash but no device then Verity is used, and we use the DM device. */
if (*what)
return 0;
if (!arg_root_hash)
if (!hash)
return 0;
arg_root_what = strdup("/dev/mapper/root");
if (!arg_root_what)
*what = path_join("/dev/mapper/", name);
if (!*what)
return log_oom();
log_info("Using verity root device %s.", arg_root_what);
log_info("Using verity %s device %s.", name, *what);
return 1;
}
static int determine_root(void) {
return determine_device(&arg_root_what, arg_root_hash, "root");
}
static int determine_usr(void) {
return determine_device(&arg_usr_what, arg_usr_hash, "usr");
}
static int run(const char *dest, const char *dest_early, const char *dest_late) {
int r, r2 = 0, r3 = 0;
@ -1026,6 +1046,7 @@ static int run(const char *dest, const char *dest_early, const char *dest_late)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
(void) determine_root();
(void) determine_usr();
/* Always honour root= and usr= in the kernel command line if we are in an initrd */
if (in_initrd()) {