From: Stephen Warren swarren@nvidia.com
Reduce the minimum length for a root=PARTUUID= parameter to be considered valid from 36 to 1. EFI/GPT partition UUIDs are always exactly 36 characters long, hence the previous limit. However, the next patch will support DOS/MBR UUIDs too, which have a different, shorter, format. Instead of validating any particular length, just ensure that at least some non-empty value was given by the user.
Also, consider a missing UUID value to be a parsing error, in the same vein as if /PARTNROFF exists and can't be parsed. As such, make both error cases print a message and disable rootwait. Convert to pr_err while we're at it.
Signed-off-by: Stephen Warren swarren@nvidia.com --- init/do_mounts.c | 35 ++++++++++++++++++++++------------- 1 files changed, 22 insertions(+), 13 deletions(-)
diff --git a/init/do_mounts.c b/init/do_mounts.c index 4dba733..fcbe825 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -119,27 +119,29 @@ static dev_t devt_from_partuuid(const char *uuid_str) struct gendisk *disk; struct hd_struct *part; int offset = 0; - - if (strlen(uuid_str) < 36) - goto done; + bool clear_root_wait = false; + char *slash;
cmp.uuid = uuid_str; - cmp.len = 36;
+ slash = strchr(uuid_str, '/'); /* Check for optional partition number offset attributes. */ - if (uuid_str[36]) { + if (slash) { char c = 0; /* Explicitly fail on poor PARTUUID syntax. */ - if (sscanf(&uuid_str[36], - "/PARTNROFF=%d%c", &offset, &c) != 1) { - printk(KERN_ERR "VFS: PARTUUID= is invalid.\n" - "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); - if (root_wait) - printk(KERN_ERR - "Disabling rootwait; root= is invalid.\n"); - root_wait = 0; + if (sscanf(slash + 1, + "PARTNROFF=%d%c", &offset, &c) != 1) { + clear_root_wait = true; goto done; } + cmp.len = slash - uuid_str; + } else { + cmp.len = strlen(uuid_str); + } + + if (!cmp.len) { + clear_root_wait = true; + goto done; }
dev = class_find_device(&block_class, NULL, &cmp, @@ -164,6 +166,13 @@ static dev_t devt_from_partuuid(const char *uuid_str) no_offset: put_device(dev); done: + if (clear_root_wait) { + pr_err("VFS: PARTUUID= is invalid.\n" + "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); + if (root_wait) + pr_err("Disabling rootwait; root= is invalid.\n"); + root_wait = 0; + } return res; } #endif