RFC3986 allows for colons to appear within the path component of a
relative URI, but iPXE will currently parse such URIs incorrectly by
interpreting the text before the colon as the URI scheme.
Fix by checking for valid characters when identifying the URI scheme.
Deliberately deviate from the RFC3986 definition of valid characters
by accepting "_" (which was incorrectly used in the iPXE-specific
"ib_srp" URI scheme and so must be accepted for compatibility with
existing deployments), and by omitting the code to check for
characters that are not used in any URI scheme supported by iPXE.
Reported-by: Ignat Korchagin <ignat@cloudflare.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
SBAT defines an encoding for security generation numbers stored as a
CSV file within a special ".sbat" section in the signed binary. If a
Secure Boot exploit is discovered then the generation number will be
incremented alongside the corresponding fix.
Platforms may then record the minimum generation number required for
any given product. This allows for an efficient revocation mechanism
that consumes minimal flash storage space (in contrast to the DBX
mechanism, which allows for only a single-digit number of revocation
events to ever take place across all possible signed binaries).
Add SBAT metadata to iPXE EFI binaries to support this mechanism.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The RFC4122 specification defines UUIDs as being in network byte
order, but an unfortunately significant amount of (mostly Microsoft)
software treats them as having the first three fields in little-endian
byte order.
In an ideal world, any server-side software that compares UUIDs for
equality would perform an endian-insensitive comparison (analogous to
comparing strings for equality using a case-insensitive comparison),
and would therefore not care about byte order differences.
Define a setting type name ":guid" to allow a UUID setting to be
formatted in little-endian order, to simplify interoperability with
server-side software that expects such a formatting.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE decodes any percent-encoded characters during the URI parsing
stage, thereby allowing protocol implementations to consume the raw
field values directly without further decoding.
When reconstructing a URI string for use in an HTTP request line, the
percent-encoding is currently reapplied in a reversible way: we
guarantee that our reconstructed URI string could be decoded to give
the same raw field values.
This technically violates RFC3986, which states that "URIs that differ
in the replacement of a reserved character with its corresponding
percent-encoded octet are not equivalent". Experiments show that
several HTTP server applications will attach meaning to the choice of
whether or not a particular character was percent-encoded, even when
the percent-encoding is unnecessary from the perspective of parsing
the URI into its component fields.
Fix by storing the originally encoded substrings for the path, query,
and fragment fields and using these original encoded versions when
reconstructing a URI string. The path field is also stored as a
decoded string, for use by protocols such as TFTP that communicate
using raw strings rather than URI-encoded strings. All other fields
(such as the username and password) continue to be stored only in
their decoded versions since nothing ever needs to know the originally
encoded versions of these fields.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some vendors provide a "system MAC address" within the DSDT/SSDT, to
be used to override the MAC address for a USB docking station.
A full implementation would require an ACPI bytecode interpreter,
since at least one OEM allows the MAC address to be constructed by
executable ACPI bytecode (rather than a fixed data structure).
We instead attempt to extract a plausible-looking "_AUXMAC_#.....#"
string that appears shortly after an "AMAC" or "MACA" signature. This
should work for most implementations encountered in practice.
Debugged-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow for the DSDT/SSDT signature-scanning and value extraction code
to be reused for extracting a pass-through MAC address.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Commit cd3de55 ("[efi] Record cached DHCPACK from loaded image's
device handle, if present") added the ability for a chainloaded UEFI
iPXE to reuse an IPv4 address and DHCP options previously obtained by
a built-in PXE stack, without needing to perform a second DHCP
request.
Extend this to also record the cached ProxyDHCPOFFER and PXEBSACK
obtained from the EFI_PXE_BASE_CODE_PROTOCOL instance installed on the
loaded image's device handle, if present.
This allows a chainloaded UEFI iPXE to reuse a boot filename or other
options that were provided via a ProxyDHCP or PXE boot server
mechanism, rather than by standard DHCP.
Tested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
RFC 3986 section 3.1 defines URI schemes as case-insensitive (though
the canonical form is always lowercase).
Use strcasecmp() rather than strcmp() to allow for case insensitivity
in URI schemes.
Requested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE will construct CPIO headers for images that have a non-empty
command line, thereby allowing raw images (without CPIO headers) to be
injected into a dynamically constructed initrd. This feature is
currently implemented within the BIOS-only bzImage format support.
Split out the CPIO header construction logic to allow for reuse in
other contexts such as in a UEFI build.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
An extracted image is wholly derived from the original archive image.
If the original archive image has been verified and marked as trusted,
then this trust logically extends to any image extracted from it.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Provide image_extract_exec() as a helper method to allow single-member
archive images (such as gzip compressed images) to be executed without
an explicit "imgextract" step.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Add the concept of extracting an image from an archive (which could be
a single-file archive such as a gzip-compressed file), along with an
"imgextract" command to expose this functionality to scripts.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The ACPI API currently expects platforms to provide access to a single
contiguous ACPI table. Some platforms (e.g. Linux userspace) do not
provide a convenient way to obtain the entire ACPI table, but do
provide access to individual tables.
All iPXE consumers of the ACPI API require access only to individual
tables.
Redefine the internal API to make acpi_find() an API method, with all
existing implementations delegating to the current RSDT-based
implementation.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The result from acpi_find_rsdt() is used only for the debug message.
Simplify the debug message and remove the otherwise redundant call to
acpi_find_rsdt().
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Split out the portions of cachedhcp.c that can be shared between BIOS
and UEFI (both of which can provide a buffer containing a previously
obtained DHCP packet, and neither of which provide a means to
determine the length of this DHCP packet).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Consolidate the remaining logic common to initrd_init() and imgmem()
into a shared image_memory() function.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Generalise the filter interface insertion logic from block_translate()
and expose as intf_insert(), allowing a filter interface to be
inserted on any existing interface.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some devices (e.g. xHCI USB host controllers) may require the use of
large areas of host memory for private use by the device. These
allocations cannot be satisfied from iPXE's limited heap space, and so
are currently allocated using umalloc() which will allocate external
system memory (and alter the system memory map as needed).
Provide dma_umalloc() to provide such allocations as part of the DMA
API, since there is otherwise no way to guarantee that the allocated
regions are usable for coherent DMA.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Include a potential DMA mapping within the definition of an I/O
buffer, and move all I/O buffer DMA mapping functions from dma.h to
iobuf.h. This avoids the need for drivers to maintain a separate list
of DMA mappings for each I/O buffer that they may handle.
Network device drivers typically do not keep track of transmit I/O
buffers, since the network device core already maintains a transmit
queue. Drivers will typically call netdev_tx_complete_next() to
complete a transmission without first obtaining the relevant I/O
buffer pointer (and will rely on the network device core automatically
cancelling any pending transmissions when the device is closed).
To allow this driver design approach to be retained, update the
netdev_tx_complete() family of functions to automatically perform the
DMA unmapping operation if required. For symmetry, also update the
netdev_rx() family of functions to behave the same way.
As a further convenience for drivers, allow the network device core to
automatically perform DMA mapping on the transmit datapath before
calling the driver's transmit() method. This avoids the need to
introduce a mapping error handling code path into the typically
error-free transmit methods.
With these changes, the modifications required to update a typical
network device driver to use the new DMA API are fairly minimal:
- Allocate and free descriptor rings and similar coherent structures
using dma_alloc()/dma_free() rather than malloc_phys()/free_phys()
- Allocate and free receive buffers using alloc_rx_iob()/free_rx_iob()
rather than alloc_iob()/free_iob()
- Calculate DMA addresses using dma() or iob_dma() rather than
virt_to_bus()
- Set a 64-bit DMA mask if needed using dma_set_mask_64bit() and
thereafter eliminate checks on DMA address ranges
- Either record the DMA device in netdev->dma, or call iob_map_tx() as
part of the transmit() method
- Ensure that debug messages use virt_to_phys() when displaying
"hardware" addresses
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Redefine the value stored within a DMA mapping to be the offset
between physical addresses and DMA addresses within the mapped region.
Provide a dma() wrapper function to calculate the DMA address for any
pointer within a mapped region, thereby simplifying the use cases when
a device needs to be given addresses other than the region start
address.
On a platform using the "flat" DMA implementation the DMA offset for
any mapped region is always zero, with the result that dma_map() can
be optimised away completely and dma() reduces to a straightforward
call to virt_to_phys().
Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE currently assumes that DMA-capable devices can directly address
physical memory using host addresses. This assumption fails when
using an IOMMU.
Define an internal DMA API with two implementations: a "flat"
implementation for use in legacy BIOS or other environments in which
flat physical addressing is guaranteed to be used and all allocated
physical addresses are guaranteed to be within a 32-bit address space,
and an "operations-based" implementation for use in UEFI or other
environments in which DMA mapping may require bus-specific handling.
The purpose of the fully inlined "flat" implementation is to allow the
trivial identity DMA mappings to be optimised out at build time,
thereby avoiding an increase in code size for legacy BIOS builds.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The malloc_dma() function allocates memory with specified physical
alignment, and is typically (though not exclusively) used to allocate
memory for DMA.
Rename to malloc_phys() to more closely match the functionality, and
to create name space for functions that specifically allocate and map
DMA-capable buffers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Fix memcmp() to return proper standard positive/negative values for
unequal comparisons. Current implementation is backwards (i.e. the
functions are returning negative when should be positive and
vice-versa).
Currently most consumers of these functions only check the return value
for ==0 or !=0 and so we can safely change the implementation without
breaking things.
However, there is one call that checks the polarity of this function,
and that is prf_sha1() for wireless WPA 4-way handshake. Due to the
incorrect memcmp() polarity, the WPA handshake creates an incorrect
PTK, and the handshake would fail after step 2. Undoubtedly, the AP
noticed the supplicant failed the mic check. This commit fixes that
issue.
Similar to commit 3946aa9 ("[libc] Fix strcmp()/strncmp() to return
proper values").
Signed-off-by: Michael Bazzinotti <bazz@bazz1.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
All implemented socket openers provide definitions for both IPv4 and
IPv6 using exactly the same opener method. Simplify the logic by
omitting the address family from the definition.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The URI parsing code for "host[:port]" checks that the final character
is not ']' in order to allow for IPv6 literals. If the entire
"host[:port]" portion of the URL is an empty string, then this will
access the preceding character. This does not result in accessing
invalid memory (since the string is guaranteed by construction to
always have a preceding character) and does not result in incorrect
behaviour (since if the string is empty then strrchr() is guaranteed
to return NULL), but it does make the code confusing to read.
Fix by inverting the order of the two tests.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The Raspberry Pi NIC has no EEPROM to hold the MAC address. The
platform firmware (e.g. UEFI or U-Boot) will typically obtain the MAC
address from the VideoCore firmware and add it to the device tree,
which is then made available to subsequent programs such as iPXE or
the Linux kernel.
Add the ability to parse a flattened device tree and to extract the
MAC address.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Fix strcmp() and strncmp() to return proper standard positive/negative
values for unequal strings. Current implementation is backwards
(i.e. the functions are returning negative when should be positive and
vice-versa).
Currently all consumers of these functions only check the return value
for ==0 or !=0 and so we can safely change the implementation without
breaking things.
Signed-off-by: Aaron Young <Aaron.Young@oracle.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Limit the profile sample count to INT_MAX to avoid both signed
overflow and a potential division by zero when updating the stored
mean value.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Checking for job progress is essentially a user interface activity,
and can safely be performed only once per timer tick (as is already
done with checking for keypresses).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Calling discard_cache() is likely to result in a call to
free_memblock(), which will call valgrind_make_blocks_noaccess()
before returning. This causes valgrind to report an invalid read on
the next iteration through the loop in alloc_memblock().
Fix by explicitly calling valgrind_make_blocks_defined() after
discard_cache() returns. Also call valgrind_make_blocks_noaccess()
before calling discard_cache(), to guard against free list corruption
while executing cache discarders.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow values to be read from ACPI tables using the syntax
${acpi/<signature>.<index>.0.<offset>.<length>}
where <signature> is the ACPI table signature as a 32-bit hexadecimal
number (e.g. 0x41504093 for the 'APIC' signature on the MADT), <index>
is the index into the array of tables matching this signature,
<offset> is the byte offset within the table, and <length> is the
field length in bytes.
Numeric values are returned in reverse byte order, since ACPI numeric
values are usually little-endian.
For example:
${acpi/0x41504943.0.0.0.0} - entire MADT table in raw hex
${acpi/0x41504943.0.0.0x0a.6:string} - MADT table OEM ID
${acpi/0x41504943.0.0.0x24.4:uint32} - local APIC address
Signed-off-by: Michael Brown <mcb30@ipxe.org>
When performing a SAN boot via INT 13, there is no way for the
operating system to indicate that it has finished using the INT 13 SAN
device. We therefore have no opportunity to clean up state before the
loaded operating system's native drivers take over. This can cause
problems when booting Windows, which tends not to be forgiving of
unexpected system state.
Windows will typically write a flag to the SAN device as the last
action before transferring control to the native drivers. We can use
this as a heuristic to bring the system to a quiescent state (without
performing a full shutdown); this provides us an opportunity to
temporarily clean up state that could otherwise prevent a successful
Windows boot.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some older operating systems (e.g. RHEL6) use a non-default filename
on the root disk and rely on setting an EFI variable to point to the
bootloader. This does not work when performing a SAN boot on a
machine where the EFI variable is not present.
Fix by allowing a non-default filename to be specified via the
"sanboot --filename" option or the "san-filename" setting. For
example:
sanboot --filename \efi\redhat\grub.efi \
iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.demo:rhel6
or
option ipxe.san-filename code 188 = string;
option ipxe.san-filename "\\efi\\redhat\\grub.efi";
option root-path "iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.demo:rhel6";
Originally-implemented-by: Vishvananda Ishaya Abrams <vish.ishaya@oracle.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Describe all SAN devices via ACPI tables such as the iBFT. For tables
that can describe only a single device (i.e. the aBFT and sBFT), one
table is installed per device. For multi-device tables (i.e. the
iBFT), all devices are described in a single table.
An underlying SAN device connection may be closed at the time that we
need to construct an ACPI table. We therefore introduce the concept
of an "ACPI descriptor" which enables the SAN boot code to maintain an
opaque pointer to the underlying object, and an "ACPI model" which can
build tables from a list of such descriptors. This separates the
lifecycles of ACPI descriptions from the lifecycles of the block
device interfaces, and allows for construction of the ACPI tables even
if the block device interface has been closed.
For a multipath SAN device, iPXE will wait until sufficient
information is available to describe all devices but will not wait for
all paths to connect successfully. For example: with a multipath
iSCSI boot iPXE will wait until at least one path has become available
and name resolution has completed on all other paths. We do this
since the iBFT has to include IP addresses rather than DNS names. We
will commence booting without waiting for the inactive paths to either
become available or close; this avoids unnecessary boot delays.
Note that the Linux kernel will refuse to accept an iBFT with more
than two NIC or target structures. We therefore describe only the
NICs that are actually required in order to reach the described
targets. Any iBFT with at most two targets is therefore guaranteed to
describe at most two NICs.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
For some block device protocols, the active path may continue to
receive xfer_window_changed() notifications during normal use. These
currently result in the active path being erroneously closed.
Fix by ignoring any xfer_window_changed() messages if this path is
already the active path.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
For multipath SAN devices, verify that the device is capable of being
opened (i.e. that all URIs are parseable and that at least one path is
alive) and thereafter retry indefinitely to reopen the device as
needed.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
When all SAN targets are completely unreachable, there will be a
natural delay between reopening attempts due to the network connection
timeout on the unreachable targets.
However, some SAN targets may accept connections instantly and report
a temporary unavailability by e.g. failing the TEST UNIT READY
command. If all targets are behaving this way then there will be no
natural delay, and we will attempt to saturate the network with
connection attempts.
Fix by introducing a small delay between attempts.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow the SAN retry count to be configured via the ${san-retry}
setting, defaulting to the current value of 10 retries if not
specified.
Note that setting a retry count of zero is inadvisable, since iSCSI
targets in particular will often report spurious errors such as "power
on occurred" for the first few commands.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Add basic support for multipath block devices. The "sanboot" and
"sanhook" commands now accept a list of SAN URIs. We open all URIs
concurrently. The first connection to become available for issuing
block device commands is marked as the active path and used for all
subsequent commands; all other connections are then closed. Whenever
the active path fails, we reopen all URIs and repeat the process.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Add a dummy SAN device which allows the "sanhook" command to be tested
even when no SAN booting capability is present on the platform. This
allows substantial portions of the SAN boot code to be run in Linux
under Valgrind.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Track the current and maximum heap usage, and display the maximum
during shutdown when DEBUG=malloc is enabled.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Avoid potential division by zero when performing the check against
multiplication overflow. (Note that if the width is zero then there
can be no overflow anyway, so it is then safe to bypass the check.)
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The SCSI layer currently implements a retry loop in order to retry
commands that fail due to spurious "error" conditions such as "power
on occurred". Move this retry loop to the generic SAN device layer:
this allow for retries due to other transient error conditions such as
an iSCSI target having dropped the connection due to inactivity.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The concept of the SAN drive number is meaningful only in a BIOS
environment, where it represents the INT13 drive number (0x80 for the
first hard disk). We retain this concept in a UEFI environment to
allow for a simple way for iPXE commands to refer to SAN drives.
Centralise the concept of the default drive number, since it is shared
between all supported environments.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Shutting down (and optionally restarting) multiple interfaces is
fraught with problems if there are loops in the interface connectivity
(e.g. the HTTP content-decoded and transfer-decoded interfaces, which
will generally loop back to each other). Various workarounds
currently exist across the codebase, generally involving preceding
calls to intf_nullify() to avoid problems due to known loops.
Provide intfs_shutdown() and intfs_restart() to allow all of an
object's interfaces to be shut down (or restarted) in a single call,
without having to worry about potential external loops.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Expose the current wall-clock time (in seconds since the Epoch), since
this is often useful in captured boot logs and can also be useful when
checking unexpected X.509 certificate validation failures.
Use a :uint32 setting to avoid Y2K38 rollover, thereby ensuring that
this will eventually be somebody else's problem.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow the active timer (providing udelay() and currticks()) to be
selected at runtime based on probing during the INIT_EARLY stage of
initialisation.
TICKS_PER_SEC is now a fixed compile-time constant for all builds, and
is independent of the underlying clock tick rate. We choose the value
1024 to allow multiplications and divisions on seconds to be converted
to bit shifts.
TICKS_PER_MS is defined as 1, allowing multiplications and divisions
on milliseconds to be omitted entirely. The 2% inaccuracy in this
definition is negligible when using the standard BIOS timer (running
at around 18.2Hz).
TIMER_RDTSC now checks for a constant TSC before claiming to be a
usable timer. (This timer can be tested in KVM via the command-line
option "-cpu host,+invtsc".)
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The call to intf_close() may result in the original interface being
reopened. For example: when reading the capacity of a 2TB+ disk via
iSCSI, the SCSI layer will respond to the intf_close() from the READ
CAPACITY (10) command by immediately issuing a READ CAPACITY (16)
command. The iSCSI layer happens to reuse the same interface for the
new command (since it allows only a single concurrent command).
Currently, intf_shutdown() unplugs the interface after the call to
intf_close() returns. In the above scenario, this results in
unplugging the just-reopened interface.
Fix by transferring the interface destination (and its reference) to a
temporary interface, and so effectively performing the unplug before
making the call to intf_close().
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Enable IMAGE_PNG (but not IMAGE_PNM) by default, and drag in the
relevant objects only when image_pixbuf() is present in the binary.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Enable both IMAGE_DER and IMAGE_PEM by default, and drag in the
relevant objects only when image_asn1() is present in the binary.
This allows "imgverify" to transparently use either DER or PEM
signature files.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow settings blocks to provide an explicit default ordering between
siblings, with lower precedence than the existing ${priority} setting.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The settings scope ipv6_scope refers specifically to IPv6 settings
that have a corresponding DHCPv6 option. Rename to dhcpv6_scope to
more accurately reflect this purpose.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
A redirection failure is fatal, but provides no opportunity for the
caller of xfer_[v]redirect() to report the failure since the interface
will already have been disconnected. Fix by sending intf_close() from
within the default xfer_vredirect() handler.
Debugged-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Provide a mechanism to allow an arbitrary adjustment to be applied to
all subsequent calls to time().
Note that the underlying clock source (e.g. the RTC clock) will not be
changed; only the time as reported within iPXE will be affected.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Extend the 16-bit PCI bus:dev.fn address to a 32-bit seg🚌dev.fn
address, assuming a segment value of zero in contexts where multiple
segments are unsupported by the underlying data structures (e.g. in
the iBFT or BOFM tables).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The non-cryptographic RNG implemented by random() has the property
that a seed value of zero will result in a generated sequence of
all-zero values. This situation can arise if currticks() returns zero
at start of day.
Work around this problem by falling back to a fixed non-zero seed if
necessary.
This has no effect on the separate DRBG used by cryptographic code.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some UEFI keyboard drivers are blissfully unaware of the existence of
either Ctrl key, and will report "Ctrl-<key>" as just "<key>". This
breaks substantial portions of the iPXE user interface.
Work around these broken UEFI drivers by allowing "ESC <key>" to be
used as a substitute for "Ctrl-<key>".
Tested-by: Dreamcat4 <dreamcat4@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Do not assume that an architecture-specific optimised memcpy() will
have the same properties as generic_memcpy() in terms of handling
overlapping regions.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Return success (rather than failure) after an image format has been
correctly identified.
This has no practical effect, since the return value from
image_probe() is deliberately never used, but avoids a somewhat
surprising and misleading "format not recognised" error message when
debugging is enabled.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The existing code intends to print NULL strings as "<NULL>" (for the
sake of debug messages), but the logic is incorrect when handling
wide-character strings. Fix the logic and add applicable unit tests.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown
Michael J. Bazzinotti
Aaron Young
Laurent Gourvénec
David Decotigny