From 787c455ed7a519bbf2e56140621259eb7b23b6fb Mon Sep 17 00:00:00 2001 From: Richard Yao Date: Thu, 9 Jan 2014 12:52:10 -0500 Subject: [PATCH] Improve partition detection on lesser used devices The format strings in efi_get_info() are intended to extract both the main device and partition number. However, this is only done correctly for hd, sd and vd devices. The format strings for ram, dm-, md and loop devices misparse the input. This causes the partition device to be incorrectly labelled as the main device with the partition being labelled 0. Reported-by: ilovezfs Signed-off-by: Richard Yao Signed-off-by: Brian Behlendorf Issue #2175 --- lib/libefi/rdwr_efi.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/lib/libefi/rdwr_efi.c b/lib/libefi/rdwr_efi.c index 2807fb0702..19a573c0b1 100644 --- a/lib/libefi/rdwr_efi.c +++ b/lib/libefi/rdwr_efi.c @@ -194,8 +194,9 @@ efi_get_info(int fd, struct dk_cinfo *dki_info) } else if ((strncmp(dev_path, "/dev/md", 7) == 0)) { strcpy(dki_info->dki_cname, "pseudo"); dki_info->dki_ctype = DKC_MD; - rval = sscanf(dev_path, "/dev/%[a-zA-Z0-9]p%hu", - dki_info->dki_dname, + strcpy(dki_info->dki_dname, "md"); + rval = sscanf(dev_path, "/dev/md%[0-9]p%hu", + dki_info->dki_dname + 2, &dki_info->dki_partition); } else if ((strncmp(dev_path, "/dev/vd", 7) == 0)) { strcpy(dki_info->dki_cname, "vd"); @@ -206,20 +207,23 @@ efi_get_info(int fd, struct dk_cinfo *dki_info) } else if ((strncmp(dev_path, "/dev/dm-", 8) == 0)) { strcpy(dki_info->dki_cname, "pseudo"); dki_info->dki_ctype = DKC_VBD; - rval = sscanf(dev_path, "/dev/%[a-zA-Z0-9-]p%hu", - dki_info->dki_dname, + strcpy(dki_info->dki_dname, "dm-"); + rval = sscanf(dev_path, "/dev/dm-%[0-9]p%hu", + dki_info->dki_dname + 3, &dki_info->dki_partition); } else if ((strncmp(dev_path, "/dev/ram", 8) == 0)) { strcpy(dki_info->dki_cname, "pseudo"); dki_info->dki_ctype = DKC_PCMCIA_MEM; - rval = sscanf(dev_path, "/dev/%[a-zA-Z0-9]p%hu", - dki_info->dki_dname, + strcpy(dki_info->dki_dname, "ram"); + rval = sscanf(dev_path, "/dev/ram%[0-9]p%hu", + dki_info->dki_dname + 3, &dki_info->dki_partition); } else if ((strncmp(dev_path, "/dev/loop", 9) == 0)) { strcpy(dki_info->dki_cname, "pseudo"); dki_info->dki_ctype = DKC_VBD; - rval = sscanf(dev_path, "/dev/%[a-zA-Z0-9]p%hu", - dki_info->dki_dname, + strcpy(dki_info->dki_dname, "loop"); + rval = sscanf(dev_path, "/dev/loop%[0-9]p%hu", + dki_info->dki_dname + 4, &dki_info->dki_partition); } else { strcpy(dki_info->dki_dname, "unknown");