From: Michael Schroeder <[email protected]> On HP z220 system (firmware version 1.54), some EFI variables are incorrectly named :
ls -d /sys/firmware/efi/vars/*8be4d* | grep -v -- -8be returns /sys/firmware/efi/vars/dbxDefault-pport8be4df61-93ca-11d2-aa0d-00e098032b8c /sys/firmware/efi/vars/KEKDefault-pport8be4df61-93ca-11d2-aa0d-00e098032b8c /sys/firmware/efi/vars/SecureBoot-pport8be4df61-93ca-11d2-aa0d-00e098032b8c /sys/firmware/efi/vars/SetupMode-Information8be4df61-93ca-11d2-aa0d-00e098032b8c That causes by the following statement in efivar_create_sysfs_entry function: *(short_name + strlen(short_name)) = '-'; efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); The trailing \0 is overwritten with '-', but the next char doesn't seem to be a \0 as well for HP. So, the second strlen return the point of next '\0', causes there have garbage string attached before GUID. Tested on On HP z220. Cc: Matt Fleming <[email protected]> Cc: Josh Boyer <[email protected]> Cc: Jeremy Kerr <[email protected]> Cc: Michael Schroeder <[email protected]> Reported-by: Frederic Crozat <[email protected]> Tested-by: Frederic Crozat <[email protected]> Signed-off-by: Lee, Chun-Yi <[email protected]> --- drivers/firmware/efivars.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 8bcb595..fbf18ff 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -1708,7 +1708,7 @@ efivar_create_sysfs_entry(struct efivars *efivars, /* This is ugly, but necessary to separate one vendor's private variables from another's. */ - *(short_name + strlen(short_name)) = '-'; + strcpy(short_name + strlen(short_name), "-"); efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); new_efivar->kobj.kset = efivars->kset; -- 1.6.0.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
