diff options
| -rw-r--r-- | src/gpt-auto-generator/gpt-auto-generator.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c index 612a3fe777..f05544f3d4 100644 --- a/src/gpt-auto-generator/gpt-auto-generator.c +++ b/src/gpt-auto-generator/gpt-auto-generator.c @@ -664,8 +664,40 @@ static int get_block_device_harder(const char *path, dev_t *dev) { if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN)) continue; - if (found) /* Don't try to support multiple backing block devices */ - goto fallback; + if (found) { + _cleanup_free_ char *u = NULL, *v = NULL, *a = NULL, *b = NULL; + + /* We found a device backed by multiple other devices. We don't really support automatic + * discovery on such setups, with the exception of dm-verity partitions. In this case there are + * two backing devices: the data partitoin and the hash partition. We are fine with such + * setups, however, only if both partitions are on the same physical device. Hence, let's + * verify this. */ + + u = strjoin(p, "/", de->d_name, "/../dev"); + if (!u) + return -ENOMEM; + + v = strjoin(p, "/", found->d_name, "/../dev"); + if (!v) + return -ENOMEM; + + r = read_one_line_file(u, &a); + if (r < 0) { + log_debug_errno(r, "Failed to read %s: %m", u); + goto fallback; + } + + r = read_one_line_file(v, &b); + if (r < 0) { + log_debug_errno(r, "Failed to read %s: %m", v); + goto fallback; + } + + /* Check if the parent device is the same. If not, then the two backing devices are on + * different physical devices, and we don't support that. */ + if (!streq(a, b)) + goto fallback; + } found = de; } |