This is a note to let you know that I've just added the patch titled
efivars: explicitly calculate length of VariableName
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
efivars-explicitly-calculate-length-of-variablename.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ec50bd32f1672d38ddce10fb1841cbfda89cfe9a Mon Sep 17 00:00:00 2001
From: Matt Fleming <matt.fleming@xxxxxxxxx>
Date: Fri, 1 Mar 2013 14:49:12 +0000
Subject: efivars: explicitly calculate length of VariableName
From: Matt Fleming <matt.fleming@xxxxxxxxx>
commit ec50bd32f1672d38ddce10fb1841cbfda89cfe9a upstream.
It's not wise to assume VariableNameSize represents the length of
VariableName, as not all firmware updates VariableNameSize in the same
way (some don't update it at all if EFI_SUCCESS is returned). There
are even implementations out there that update VariableNameSize with
values that are both larger than the string returned in VariableName
and smaller than the buffer passed to GetNextVariableName(), which
resulted in the following bug report from Michael Schroeder,
> 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
The issue here is that because we blindly use VariableNameSize without
verifying its value, we can potentially read garbage values from the
buffer containing VariableName if VariableNameSize is larger than the
length of VariableName.
Since VariableName is a string, we can calculate its size by searching
for the terminating NULL character.
[Backported for 3.8-stable. Removed workqueue code added in
a93bc0c 3.9-rc1.]
Reported-by: Frederic Crozat <fcrozat@xxxxxxxx>
Cc: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
Cc: Josh Boyer <jwboyer@xxxxxxxxxx>
Cc: Michael Schroeder <mls@xxxxxxxx>
Cc: Lee, Chun-Yi <jlee@xxxxxxxx>
Cc: Lingzhu Xiang <lxiang@xxxxxxxxxx>
Cc: Seiji Aguchi <seiji.aguchi@xxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
Signed-off-by: Lingzhu Xiang <lxiang@xxxxxxxxxx>
Reviewed-by: CAI Qian <caiqian@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/efivars.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -943,6 +943,31 @@ static ssize_t efivar_delete(struct file
}
/*
+ * Returns the size of variable_name, in bytes, including the
+ * terminating NULL character, or variable_name_size if no NULL
+ * character is found among the first variable_name_size bytes.
+ */
+static unsigned long var_name_strnsize(efi_char16_t *variable_name,
+ unsigned long variable_name_size)
+{
+ unsigned long len;
+ efi_char16_t c;
+
+ /*
+ * The variable name is, by definition, a NULL-terminated
+ * string, so make absolutely sure that variable_name_size is
+ * the value we expect it to be. If not, return the real size.
+ */
+ for (len = 2; len <= variable_name_size; len += sizeof(c)) {
+ c = variable_name[(len / sizeof(c)) - 1];
+ if (!c)
+ break;
+ }
+
+ return min(len, variable_name_size);
+}
+
+/*
* Let's not leave out systab information that snuck into
* the efivars driver
*/
@@ -1169,6 +1194,8 @@ int register_efivars(struct efivars *efi
&vendor_guid);
switch (status) {
case EFI_SUCCESS:
+ variable_name_size = var_name_strnsize(variable_name,
+ variable_name_size);
efivar_create_sysfs_entry(efivars,
variable_name_size,
variable_name,
Patches currently in stable-queue which might be from matt.fleming@xxxxxxxxx are
queue-3.4/efivars-handle-duplicate-names-from-get_next_variable.patch
queue-3.4/efivars-explicitly-calculate-length-of-variablename.patch
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