Build error occurs when CONFIG_EFI_SECURE_BOOT or
CONFIG_EFI_CAPSULE_AUTHENTICATE is enabled,
because hash-checksum.c is not compiled.
Since hash_calculate() implemented in hash-checksum.c can be
commonly used aside from FIT image signature verification,
this commit itroduces HASH_CALCULATE option to decide
if hash-checksum.c shall be compiled.
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
EFI_TCG2 depends not only on TPMv2 but also on the underlying algorithms.
So select the missing SHA1, SHA256, SHA384 and SHA512 we currently support
Reported-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Add 'default y'.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Up to now we are stopping the EFI subsystem if a TPMv2 exists but the
protocol fails to install. Now that we've switched the config to 'default
y' the sandbox TPM fails, since it doesn't support all the required
capabilities of the protocol.
Not installing the protocol is not catastrophic. If the protocol fails
to install the PCRs will never be extended to the expected values, so
some other entity later in the boot flow will eventually figure it out
and take the necessary actions.
While at it fix a corner case were the user can see an invalid error
message when the protocol failed to install. We do have a tcg2_uninit()
which we call when the protocol installation fails. There are cases though
that this might be called before the configuration table is installed (e.g
probing the TPM for capabilities failed). In that case the user will see
"Failed to delete final events config table". So stop printing it since it's
not an actual failure , simply because the config table was never installed
in the first place.
In order to stop printing it make efi_init_event_log() and create_final_event()
cleanup themselves and only call tcg2_uninit() when the protocol installation
fails.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Instead of just failing, clean up the installed config table and
EventLog memory if logging an s-crtm event fails during the protocol
installation
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Eliminate label 'out:' by using return.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
efi_init_event_log() calls tcg2_uninit() in case of failure.
We can skip that since the function is called on efi_tcg2_register()
which also cleans up if an error occurs
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This is same issue as https://bugzilla.redhat.com/show_bug.cgi?id=1733817,
but that fix was wrongly partial reverted.
When reading a directory, EFI_BUFFER_TOO_SMALL should be returned when
the supplied buffer is too small, so a use-case is to call
EFI_FILE_PROTOCOL.Read() with *buffer_size=0 and buffer=NULL to
obtain the needed size before doing the actual read.
So remove the check only for directory reading, file reading already
do the check by itself.
Fixes: db12f518edb0("efi_loader: implement non-blocking file services")
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefan Sørensen <stefan.sorensen@spectralink.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The current capsule authentication code checks if the environment
variable capsule_authentication_enabled is set, for authenticating the
capsule. This is in addition to the check for the config symbol
CONFIG_EFI_CAPSULE_AUTHENTICATE. Remove the check for the environment
variable. The capsule will now be authenticated if the config symbol
is set.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviwed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Building 32bit boards with the TCG2 protocol enabled leads to a build
warning due to a missing conversion.
lib/efi_loader/efi_tcg2.c:774:27:
error: cast to pointer from integer of different size
[-Werror=int-to-pointer-cast]
774 | ret = tcg2_create_digest((u8 *)data_to_hash, data_to_hash_len,
| ^
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
In case of failure at efi_get_variable_int("BootOrder"), we should
skip examining boot option variables and return an appropriate error
code which is the one the function returned.
Fixes: CID 331153 Code maintainability issues (UNUSED_VALUE)
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Indicated by Coverity Scan CID 331147
The ESRT was being refreshed in situations where the UpdateCapsule
procedure failed. In that scenario:
1) the ESRT refresh was superfluous.
2) a failed ESRT refresh return code overwrites the UpdateCapsule error
return code.
This commit ensures that the ESRT is only refreshed when the
UpdateCapsule performs successfully.
CC: Heinrich Schuchardt <xypron.glpk@gmx.de>
CC: Sughosh Ganu <sughosh.ganu@linaro.org>
CC: AKASHI Takahiro <takahiro.akashi@linaro.org>
CC: Tom Rini <trini@konsulko.com>
CC: Andre Przywara <andre.przywara@arm.com>
CC: nd@arm.com
Signed-off-by: Jose Marinho <jose.marinho@arm.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Bumping the digest list count, for all supported algorithms, can be
calculated outside of the individual switch statements. So let's do that
for every loop iteration instead and simplify the code a bit.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
To avoid diverging function definitions we need to include efi_loader.h.
Fixes: fe179d7fb5 ("efi_loader: Add size checks to efi_create_indexed_name()")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Variable "final" will have SHA512 digest, but currently
the array size is not sufficient. Let's fix it.
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
If realloc() fails, we should free the old buffer.
Fixes: c74cd8bd08d1: ("efi_loader: capsule: add capsule_on_disk support")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Remove function invocations using the EFI_CALL macro for those
functions that do not have an EFI_ENTRY call in their definition. Such
functions can use u-boot api's which rely on u-boot global data(gd)
pointer. The Arm and RiscV architectures maintain a separate gd
pointer, one for u-boot, and a separate gd for the efi application.
Calling a function through the EFI_CALL macro changes the gd pointer
to that used for the efi application, with u-boot gd being
unavailable. Any function then trying to dereference u-boot's gd will
result in an abort.
Fix this issue by removing the EFI_CALL macro for all of such
functions which do not begin by an EFI_ENTRY function call.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Although ptr arithmetics are allowed with extensions in gcc, they
are not allowed by the C spec. So switch to (void *)(uintptr_t) instead
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Fix the build warning when building for 32 bit systems by using the
length modifier for size_t.
lib/efi_loader/efi_esrt.c: In function ‘efi_esrt_populate’:
include/efi_loader.h:126:8: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 8 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Enable building of the crypto helper functions used during capsule
authentication by selecting IMAGE_SIGN_INFO.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
get_var() is defined statically in efi_bootmgr.c and doesn't properly
check a buffer allocation. Remove it completely and use the exported
function from efi_var_common.c that does the same thing
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
In the devicepath node to text conversion for Uart nodes a break statement
is missing.
Indicated by Coverity Scan CID 330038
Fixes: 62df6e9c99 ("efi_loader: Uart device path")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
We recently added a common function for calculating file size,
instead of copy pasting the code around. Switch one of the
occurences over to the common function
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviwed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
TCG PC Client Platform Firmware Profile Spec mandates that an S-CRTM
event for the version identifier using the event type EV_S_CRTM_VERSION
must be measured.
So since we are trying to add more conformance into U-Boot, let's add
the event using U_BOOT_VERSION_STRING, extend PCR[0] accordingly and log
it in the EventLog
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Current code doesn't free the efi allocated memory in case the protocol
failed to install
Fixes: c8d0fd5825 ("efi_loader: Introduce eventlog support for TCG2_PROTOCOL")
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
The ESRT is initialised during efi_init_objlist after
efi_initialize_system_table().
The ESRT is recreated from scratch at the following events:
- successful UpdateCapsule;
- FMP instance install.
The code ensures that every ESRT entry has a unique fw_class value.
Limitations:
- The ESRT is not updated if an FMP instance is uninstalled;
- the fields image_type and flags are in the current implementation left
undefined. Setting these values will require a per-platform function
that returns the image_type/flags as a function of the image fw_class.
CC: Heinrich Schuchardt <xypron.glpk@gmx.de>
CC: Sughosh Ganu <sughosh.ganu@linaro.org>
CC: AKASHI Takahiro <takahiro.akashi@linaro.org>
CC: Ilias Apalodimas <ilias.apalodimas@linaro.org>
CC: Andre Przywara <andre.przywara@arm.com>
CC: Alexander Graf <agraf@csgraf.de>
CC: nd@arm.com
Signed-off-by: Jose Marinho <jose.marinho@arm.com>
Remove two EFI_CALL() indirections.
Move ESRT GUID in efidebug's list of GUIDs.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Up to now we install EFI_LOAD_FILE2_PROTOCOL to load an initrd
unconditionally. Although we correctly return various EFI exit codes
depending on the file status (i.e EFI_NO_MEDIA, EFI_NOT_FOUND etc), the
kernel loader, only falls back to the cmdline interpreted initrd if the
protocol is not installed.
This creates a problem for EFI installers, since they won't be able to
load their own initrd and continue the installation. It also makes the
feature hard to use, since we can either have a single initrd or we have
to recompile u-boot if the filename changes.
So let's introduce a different logic that will decouple the initrd
path from the config option we currently have.
When defining a UEFI BootXXXX we can use the filepathlist and store
a file path pointing to our initrd. Specifically the EFI spec describes:
"The first element of the array is a device path that describes the device
and location of the Image for this load option. Other device paths may
optionally exist in the FilePathList, but their usage is OSV specific"
When the EFI application is launched through the bootmgr, we'll try to
interpret the extra device path. If that points to a file that exists on
our disk, we'll now install the load_file2 and the efi-stub will be able
to use it.
This opens up another path using U-Boot and defines a new boot flow.
A user will be able to control the kernel/initrd pairs without explicit
cmdline args or GRUB.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
A following patch introduces a different logic for loading initrd's
based on the EFI_LOAD_FILE2_PROTOCOL.
Since similar logic can be applied in the future for other system files
(i.e DTBs), let's add some helper functions which will retrieve and
parse file paths stored in EFI variables.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
On the following patches we allow for an initrd path to be stored in
Boot#### variables. Specifically we encode in the FIlePathList[] of
the EFI_LOAD_OPTIONS for each Boot#### variable.
The FilePathList[] array looks like this:
kernel - 0xff - VenMedia(initrd GUID) - initrd1 - 0x01 initrd2 - 0xff
So let's add the relevant functions to concatenate and retrieve a device
path based on a Vendor GUID.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reformat function descriptions.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
When uploading an EFI binary via the UART we need to assign a device path.
* Provide devicepath node to text conversion for Uart() node.
* Provide function to create Uart() device path.
* Add UART support to efi_dp_from_name().
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Even if CONFIG_DM_VIDEO=y and stdout="vidconsole", a video device may not
be available. Check the return values of the relevant functions.
If no video output device is available, assume that the serial console is
in use.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This occur when building on Raspberry Pi 400 (32-bit ARM). Fix them.
Examples:
cmd/efidebug.c: In function ‘do_efi_capsule_update’:
cmd/efidebug.c:75:49: warning: cast from pointer to integer of different
size [-Wpointer-to-int-cast]
ret = EFI_CALL(RT->update_capsule(&capsule, 1, (u64)NULL));
^
include/efi_loader.h:104:9: note: in definition of macro ‘EFI_CALL’
typeof(exp) _r = exp; \
^~~
cmd/efidebug.c:75:49: warning: cast from pointer to integer of different
size [-Wpointer-to-int-cast]
ret = EFI_CALL(RT->update_capsule(&capsule, 1, (u64)NULL));
^
include/efi_loader.h:104:19: note: in definition of macro ‘EFI_CALL’
typeof(exp) _r = exp; \
^~~
In file included from include/common.h:20,
from lib/efi_loader/efi_capsule.c:9:
lib/efi_loader/efi_capsule.c: In function ‘efi_update_capsule’:
include/efi_loader.h:83:8: warning: format ‘%lu’ expects argument of type
‘long unsigned int’, but argument 10 has type ‘size_t’
{aka ‘unsigned int’} [-Wformat=]
debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
^~~~~~~~~~~~~~~~~~
include/linux/printk.h:37:21: note: in definition of macro ‘pr_fmt’
#define pr_fmt(fmt) fmt
^~~
include/log.h:229:2: note: in expansion of macro ‘log’
log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
^~~
include/log.h:249:2: note: in expansion of macro ‘debug_cond’
debug_cond(_DEBUG, fmt, ##args)
^~~~~~~~~~
include/efi_loader.h:83:2: note: in expansion of macro ‘debug’
debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
^~~~~
lib/efi_loader/efi_capsule.c:444:2: note: in expansion of macro ‘EFI_ENTRY’
EFI_ENTRY("%p, %lu, %llu\n", capsule_header_array, capsule_count,
^~~~~~~~~
lib/efi_loader/efi_capsule.c:444:19: note: format string is defined here
EFI_ENTRY("%p, %lu, %llu\n", capsule_header_array, capsule_count,
~~^
%u
Signed-off-by: Simon Glass <sjg@chromium.org>
Replace (uintptr_t)NULL by 0.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The (yet unreleased version of the) devicetree specification clearly
states that:
As with the /reserved-memory node, when booting via UEFI
entries in the Memory Reservation Block must also be listed
in the system memory map obtained via the GetMemoryMap() toi
protect against allocations by UEFI applications. The memory
reservation block entries should be listed with type
EfiReservedMemoryType.
This restores the behaviour that was changed by commit 4cbb2930bd
("efi_loader: consider no-map property of reserved memory").
Fixes: 4cbb2930bd ("efi_loader: consider no-map property of reserved memory")
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
GRUB_ARM32_WORKAROUND can be disabled on ARCH_SUNXI as the Allwinner SoCs
only have a level 2 cache controlled via CP15 and not an architecturally
defined cache. Having the cache available speeds up booting Linux.
On ARCH_BCM283X it is already disabled via rpi_2_defconfig. But let's move
this setting to Kconfig.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
When uploading an EFI binary via the UART we need to assign a device path.
* Provide devicepath node to text conversion for Uart() node.
* Provide function to create Uart() device path.
* Add UART support to efi_dp_from_name().
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Even if CONFIG_DM_VIDEO=y and stdout="vidconsole", a video device may not
be available. Check the return values of the relevant functions.
If no video output device is available, assume that the serial console is
in use.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This occur when building on Raspberry Pi 400 (32-bit ARM). Fix them.
Examples:
cmd/efidebug.c: In function ‘do_efi_capsule_update’:
cmd/efidebug.c:75:49: warning: cast from pointer to integer of different
size [-Wpointer-to-int-cast]
ret = EFI_CALL(RT->update_capsule(&capsule, 1, (u64)NULL));
^
include/efi_loader.h:104:9: note: in definition of macro ‘EFI_CALL’
typeof(exp) _r = exp; \
^~~
cmd/efidebug.c:75:49: warning: cast from pointer to integer of different
size [-Wpointer-to-int-cast]
ret = EFI_CALL(RT->update_capsule(&capsule, 1, (u64)NULL));
^
include/efi_loader.h:104:19: note: in definition of macro ‘EFI_CALL’
typeof(exp) _r = exp; \
^~~
In file included from include/common.h:20,
from lib/efi_loader/efi_capsule.c:9:
lib/efi_loader/efi_capsule.c: In function ‘efi_update_capsule’:
include/efi_loader.h:83:8: warning: format ‘%lu’ expects argument of type
‘long unsigned int’, but argument 10 has type ‘size_t’
{aka ‘unsigned int’} [-Wformat=]
debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
^~~~~~~~~~~~~~~~~~
include/linux/printk.h:37:21: note: in definition of macro ‘pr_fmt’
#define pr_fmt(fmt) fmt
^~~
include/log.h:229:2: note: in expansion of macro ‘log’
log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
^~~
include/log.h:249:2: note: in expansion of macro ‘debug_cond’
debug_cond(_DEBUG, fmt, ##args)
^~~~~~~~~~
include/efi_loader.h:83:2: note: in expansion of macro ‘debug’
debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
^~~~~
lib/efi_loader/efi_capsule.c:444:2: note: in expansion of macro ‘EFI_ENTRY’
EFI_ENTRY("%p, %lu, %llu\n", capsule_header_array, capsule_count,
^~~~~~~~~
lib/efi_loader/efi_capsule.c:444:19: note: format string is defined here
EFI_ENTRY("%p, %lu, %llu\n", capsule_header_array, capsule_count,
~~^
%u
Signed-off-by: Simon Glass <sjg@chromium.org>
Replace (uintptr_t)NULL by 0.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The (yet unreleased version of the) devicetree specification clearly
states that:
As with the /reserved-memory node, when booting via UEFI
entries in the Memory Reservation Block must also be listed
in the system memory map obtained via the GetMemoryMap() toi
protect against allocations by UEFI applications. The memory
reservation block entries should be listed with type
EfiReservedMemoryType.
This restores the behaviour that was changed by commit 4cbb2930bd
("efi_loader: consider no-map property of reserved memory").
Fixes: 4cbb2930bd ("efi_loader: consider no-map property of reserved memory")
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
GRUB_ARM32_WORKAROUND can be disabled on ARCH_SUNXI as the Allwinner SoCs
only have a level 2 cache controlled via CP15 and not an architecturally
defined cache. Having the cache available speeds up booting Linux.
On ARCH_BCM283X it is already disabled via rpi_2_defconfig. But let's move
this setting to Kconfig.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Carve out a function to translate a Unicode code point to an 8bit codepage.
Provide a unit test for the new function.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
If stdout is 'vidconsole', we correctly set the console size.
If stdout is 'vidconsole,serial', the video console is ignored.
We should always evaluate the size of vidconsole if it is the primary
console.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
VenHw and VenMedia device path nodes may carry vendor defined data of
arbitrary length. When converting a device path node to text ensure that we
do not overrun our internal buffer.
In our implementation of
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL.ConvertDevicePathToText() we could first
determine the output length and then allocate buffers but that would nearly
double the code size. Therefore keep the preallocated buffers and truncate
excessive device paths instead.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The UEFI spec does not allow ACPI tables to be in runtime services memory.
It recommends EfiACPIReclaimMemory.
Remove a superfluous check that the allocated pages are 16 byte aligned.
EFI pages are 4 KiB aligned.
Fixes: 86df34d42b ("efi_loader: Install ACPI configuration tables")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Our current implementation of
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL.ConvertDevicePathToText() truncates multi
part device paths after the first part. We should convert all parts.
Render device path instance ends as commas. This is not explicitly
described in the UEFI spec but mimics what EDK II does.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
The last block is of size media->block_size
Signed-off-by: Jesper Schmitz Mouridsen <jesper@schmitz.computer>
Simplify expression.
Apply same change to efi_disk_write_blocks().
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
fix get_last_capsule() leads to writes beyond the stack allocated buffer.
This was indicated when enabling the stack protector.
utf16_utf8_strcpy() only stops copying when reaching '\0'. The current
invocation always writes beyond the end of value[].
The output length of utf16_utf8_strcpy() may be longer than the number of
UTF-16 tokens. E.g has "CapsuleКиев" has 11 UTF-16 tokens but 15 UTF-8
tokens. Hence, using utf16_utf8_strcpy() without checking the input may
lead to further writes beyond value[].
The current invocation of strict_strtoul() reads beyond the end of value[].
A non-hexadecimal value after "Capsule" (e.g. "CapsuleZZZZ") must result in
an error. We cat catch this by checking the return value of strict_strtoul().
A value that is too short after "Capsule" (e.g. "Capsule0") must result in
an error. We must check the string length of value[].
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
