On 10/26/2012 03:51 PM, Matt Fleming wrote:
> +static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
> +{
> + guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]);
> + guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]);
> + guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]);
> + guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]);
> + guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]);
> + guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]);
> + guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]);
> + guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]);
> + guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]);
> + guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]);
> + guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]);
> + guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]);
> + guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]);
> + guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]);
> + guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]);
> + guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]);
> +}
> +
> +static int efivarfs_create(struct inode *dir, struct dentry *dentry,
> + umode_t mode, bool excl)
> +{
> + struct inode *inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
> + struct efivars *efivars = &__efivars;
> + struct efivar_entry *var;
> + int namelen, i = 0, err = 0;
> +
> + if (dentry->d_name.len < 38)
> + return -EINVAL;
> +
> + if (!inode)
> + return -ENOSPC;
> +
> + var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
> +
> + if (!var)
> + return -ENOMEM;
> +
> + namelen = dentry->d_name.len - GUID_LEN;
> +
> + efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
> + &var->var.VendorGuid);
efivarfs_hex_to_guid does not check filename validity.
[root@qemu-ovmf efivars]# touch test-------------------------------------
[root@qemu-ovmf efivars]# ll test*
-rw-r--r--. 1 root root 0 Jan 25 14:57 test-------------------------------------
[root@qemu-ovmf efivars]# cd ..; umount efivars; mount -t efivarfs - efivars; cd -
/sys/firmware/efi/efivars
[root@qemu-ovmf efivars]# ll test*
-rw-r--r--. 1 root root 4 Jan 25 14:57 test-ffffffff-ffff-ffff-ffff-ffffffffffff
[root@qemu-ovmf efivars]# touch BootOrder-8BE4DF61-93CA-11D2-AA0D-00E098032B8C
[root@qemu-ovmf efivars]# ll BootOrder*
-rw-r--r--. 1 root root 12 Jan 25 14:49 BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r--. 1 root root 0 Jan 25 14:55 BootOrder-8BE4DF61-93CA-11D2-AA0D-00E098032B8C
[root@qemu-ovmf efivars]# cd ..; umount efivars; mount -t efivarfs - efivars; cd -
/sys/firmware/efi/efivars
[root@qemu-ovmf efivars]# ll BootOrder*
-rw-r--r--. 1 root root 12 Jan 25 14:56 BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r--. 1 root root 12 Jan 25 14:56 BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c
--
Lingzhu Xiang
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