The definition of bpb's num_total_sectors_16 and num_total_sectors_32
is that either the 16-bit field is non-zero and is used (in which case
eg mkfs.fat sets the 32-bit field to zero), or it is zero and the
32-bit field is used. Therefore, a BPB is invalid only if *both*
fields are zero; having one field as zero and the other as non-zero is
the case to be expected. (Indeed, according to Microsoft's specification
one of the fields *must* be zero, and the other non-zero.)
This affects all users of grub_chainloader_patch_bpb which are in
chainloader.c, freedos.c, and ntldr.c
Some descriptions of the semantics of these two fields:
https://www.win.tue.nl/~aeb/linux/fs/fat/fat-1.html
The old 2-byte fields "total number of sectors" and "number of
sectors per FAT" are now zero; this information is now found in
the new 4-byte fields.
(Here given in the FAT32 EBPB section but the total sectors 16/32 bit
fields semantic is true of FAT12 and FAT16 too.)
https://wiki.osdev.org/FAT#BPB_.28BIOS_Parameter_Block.29
19 | 2 | The total sectors in the logical volume. If this value is 0,
it means there are more than 65535 sectors in the volume, and the actual
count is stored in "Large Sectors (bytes 32-35).
32 | 4 | Large amount of sector on media. This field is set if there
are more than 65535 sectors in the volume.
(Doesn't specify what the "large" field is set to when unused, but as
mentioned mkfs.fat sets it to zero then.)
https://technet.microsoft.com/en-us/library/cc976796.aspx
0x13 | WORD | 0x0000 |
Small Sectors . The number of sectors on the volume represented in 16
bits (< 65,536). For volumes larger than 65,536 sectors, this field
has a value of zero and the Large Sectors field is used instead.
0x20 | DWORD | 0x01F03E00 |
Large Sectors . If the value of the Small Sectors field is zero, this
field contains the total number of sectors in the FAT16 volume. If the
value of the Small Sectors field is not zero, the value of this field
is zero.
https://staff.washington.edu/dittrich/misc/fatgen103.pdf page 10
BPB_TotSec16 | 19 | 2 |
This field is the old 16-bit total count of sectors on the volume.
This count includes the count of all sectors in all four regions of the
volume. This field can be 0; if it is 0, then BPB_TotSec32 must be
non-zero. For FAT32 volumes, this field must be 0. For FAT12 and
FAT16 volumes, this field contains the sector count, and
BPB_TotSec32 is 0 if the total sector count “fits” (is less than
0x10000).
BPB_TotSec32 | 32 | 4 |
This field is the new 32-bit total count of sectors on the volume.
This count includes the count of all sectors in all four regions of the
volume. This field can be 0; if it is 0, then BPB_TotSec16 must be
non-zero. For FAT32 volumes, this field must be non-zero. For
FAT12/FAT16 volumes, this field contains the sector count if
BPB_TotSec16 is 0 (count is greater than or equal to 0x10000).
(This specifies that an unused BPB_TotSec32 field is set to zero.)
By the way fix offsets in include/grub/fat.h.
Tested with lDebug booted in qemu via grub2's
FreeDOS direct loading support, refer to
https://bitbucket.org/ecm/ldosboot + https://bitbucket.org/ecm/ldebug
Signed-off-by: C. Masloch <pushbx@38.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Starting from binutils commit bd7ab16b4537788ad53521c45469a1bdae84ad4a:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=bd7ab16b4537788ad53521c45469a1bdae84ad4a
x86-64 assembler generates R_X86_64_PLT32, instead of R_X86_64_PC32, for
32-bit PC-relative branches. Grub2 should treat R_X86_64_PLT32 as
R_X86_64_PC32.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Code is currently ignoring errors from efibootmgr, giving users
clearly bogus output like:
Setting up grub-efi-amd64 (2.02~beta3-4) ...
Installing for x86_64-efi platform.
Could not delete variable: No space left on device
Could not prepare Boot variable: No space left on device
Installation finished. No error reported.
and then potentially unbootable systems. If efibootmgr fails, grub-install
should know that and report it!
We've been using similar patch in Debian now for some time, with no ill effects.
Signed-off-by: Steve McIntyre <93sam@debian.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Fix the Open Firmware (OF) path property for sun4v SPARC systems.
These platforms do not have a /sas/ within their path. Over time
different OF addressing schemes have been supported. There
is no generic addressing scheme that works across every HBA.
It looks that this functionality will not work if you try to cross-install
SPARC GRUB2 binary using e.g. x86 grub-install. By default it should work.
However, we will also have other issues here, like lack of access to OF
firmware/paths, which make such configs unusable anyway. So, let's leave
this patch as is for time being. If somebody cares then he/she should fix
the issue(s) at some point.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Add block-list GPT support for SPARC. The OBP "load" and "boot" methods
are partition aware and neither command can see the partition table. Also
neither command can address the entire physical disk. When the install
happens, grub generates the block-list entries based on the beginning of the
physical disk, not the beginning of the partition. This patch fixes the
block-list entries so they match what OBP expects during boot for a GPT disk.
T5 and above now supports GPT as well as VTOC.
This patch has been tested on T5-2 and newer SPARC systems.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Check the error bits in the interrupt status register. According to the
AHCI 1.2 spec, "Interrupt sources that are disabled (‘0’) are still
reflected in the status registers.", so this should work even though
grub uses polling
This fixes the following problem on a Fujitsu E744 laptop:
Sometimes there is a very long delay (up to several minutes) when
booting from hard disk. It seems accessing the DVD drive (which has no
disk inserted) sometimes fails with some errors, which leads to each
access being stalled until the 20s timeout triggers. This seems to
happen when grub is trying to read filesystem/partition data.
The problem is that the command_issue bit that is checked in the loop is
only reset if the "HBA receives a FIS which clears the BSY, DRQ, and ERR
bits for the command", but the ERR bit is never cleared. Therefore
command_issue is never reset and grub waits for the timeout.
The relevant bit in our case is the Task File Error Status (TFES), which
is equivalent to the ERR bit 0 in tfd. But this patch also checks
the other error bits except for the "Interface non-fatal error status"
bit.
Signed-off-by: Stefan Fritsch <fritsch@genua.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
grub-mkconfig will set GRUB_TERMINAL_OUTPUT to "gfxterm" unless the user
has overridden it. On EFI systems, this will stop output from going to the
default "console" terminal. When the EFI fw console is configured to output to
both serial and video, this will cause GRUB to only display on video - while
continuing to accept input from both video and serial.
Instead of switching from "console" to "gfxterm", let's output to both.
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The properties #address-cells and #size-cells are used to know the
number of cells for ranges provided by "regs". If they don't exist, the
value are resp. 2 and 1.
Currently, when multiboot nodes are created it is assumed that #address-cells
and #size-cells are exactly 2. However, they are never set by GRUB and
will result to later failure when the device-tree is generated by GRUB
or contain different values.
To prevent this failure, create the both properties in the chosen nodes.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
grub-mkconfig detects detached RSA signatures for kernel images used for
signature checking as valid images and adds them to grub.cfg as separate
menu entries. This patch adds .sig extension to common blacklist.
Signed-off-by: Jordan Glover <Golden_Miller83@protonmail.ch>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Prevent a double open. This can cause problems with some ieee1275
devices, causing the system to hang. The double open can occur
as follows:
grub_ls_list_files (char *dirname, int longlist, int all, int human)
dev = grub_device_open (device_name);
dev remains open while:
grub_normal_print_device_info (device_name);
dev = grub_device_open (name);
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
On efi systems, make pmtimer based tsc calibration the default over the
pit. This prevents Grub from hanging on Intel SoC systems that power gate
the pit.
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
When we exit grub, we don't free all the memory that we allocated earlier
for our heap region. This can cause problems with setups where you try
to descend the boot order using "exit" entries, such as PXE -> HD boot
scenarios.
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The reboot function calls machine_fini() and then reboots the system.
Currently it lives in lib/ which means it gets compiled into the
reboot module which lives on the heap.
In a following patch, I want to free the heap on machine_fini()
though, so we would free the memory that the code is running in. That
obviously breaks with smarter UEFI implementations.
So this patch moves it into the core. That way we ensure that all
code running after machine_fini() in the UEFI case is running from
memory that got allocated (and gets deallocated) by the UEFI core.
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The multiboot2 is much more preferable than multiboot. Especiall
if booting under EFI where multiboot does not have the functionality
to pass ImageHandler.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Commit d33045ce7f introduced
the support for this, but it does not work under x86 (as it stops
20_linux_xen from running).
The 20_linux_xen is run under a shell and any exits from within it:
(For example on x86):
+ /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
[root@tst063 grub]# echo $?
1
will result in 20_linux_xen exiting without continuing
and also causing grub2-mkconfig to stop processing.
As in:
[root@tst063 grub]# ./grub-mkconfig | tail
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.13.0-0.rc5.git1.1.fc27.x86_64
Found initrd image: /boot/initramfs-4.13.0-0.rc5.git1.1.fc27.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2
Found initrd image: /boot/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
echo 'Loading Linux 0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 ...'
linux /vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 root=/dev/mapper/fedora_tst063-root ro single
echo 'Loading initial ramdisk ...'
initrd /initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
}
}
### END /usr/local/etc/grub.d/10_linux ###
### BEGIN /usr/local/etc/grub.d/20_linux_xen ###
root@tst063 grub]#
And no more.
This patch wraps the invocation of grub-file to be a in subshell
and to process the return value in a conditional. That fixes
the issue.
RH-BZ 1486002: grub2-mkconfig does not work if xen.gz is installed.
CC: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The `grub_util_exec_redirect_all` helper function can be used to
spawn an executable and redirect its output to some files. After calling
`fork()`, the parent will wait for the child to terminate with
`waitpid()` while the child prepares its file descriptors, environment
and finally calls `execvp()`. If something in the children's setup
fails, it will stop by calling `exit(127)`.
Calling `exit()` will cause any function registered via `atexit()` to be
executed, which is usually the wrong thing to do in a child. And
actually, one can easily observe faulty behaviour on musl-based systems
without modprobe(8) installed: executing `grub-install --help` will call
`grub_util_exec_redirect_all` with "modprobe", which obviously fails if
modprobe(8) is not installed. Due to the child now exiting and invoking
the `atexit()` handlers, it will clean up some data structures of the
parent and cause it to be deadlocked in the `waitpid()` syscall.
The issue can easily be fixed by calling `_exit(127)` instead, which is
especially designed to be called when the atexit-handlers should not be
executed.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Previously we had multiboot and multiboot2 declaring the same symbols.
This can potentially lead to aliasing and strange behaviours when e.g.
module instead of module2 is used with multiboot2.
Bug: #51137
With upcoming changes to EDK2, allocations of type EFI_LOADER_DATA may
not return regions with execute ability. Since modules are loaded onto
the heap, change the heap allocation type to GRUB_EFI_LOADER_CODE in
order to permit execution on systems with this feature enabled.
Closes: 50420
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
In preparation for turning this into a common loader for 32-bit and 64-bit
platforms, ensure the code will compile cleanly for either.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Add a generic GRUB_PE32_MAGIC definition for the PE 'MZ' tag and delete
the existing one in arm64/linux.h.
Update arm64 Linux loader to use this new definition.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
There is nothing ARM64 (or even ARM) specific about the efi fdt helper
library, which is used for locating or overriding a firmware-provided
devicetree in a UEFI system - so move it to loader/efi for reuse.
Move the fdtload.h include file to grub/efi and update path to
efi/fdtload.h in source code referring to it.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
grub_efi_allocate_pages Essentially does 2 unrelated things:
* Allocate at fixed address.
* Allocate at any address.
To switch between 2 different functions it uses address == 0 as magic
value which is wrong as 0 is a perfectly valid fixed adress to allocate at.
Expose a new function, grub_efi_allocate_pages_real(), making it possible
to specify allocation type and memory type as supported by the UEFI
AllocatePages boot service.
Make grub_efi_allocate_pages() a consumer of the new function,
maintaining its old functionality.
Also delete some left-around #if 1/#else blocks in the affected
functions.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Use same algorithm as in libblkid from util-linux v2.30.
1. Take first 16 bytes from UTF-8 encoded string of VolumeSetIdentifier
2. If all bytes are hexadecimal digits, convert to lowercase and use as UUID
3. If first 8 bytes are not all hexadecimal digits, convert those 8 bytes
to their hexadecimal representation, resulting in 16 bytes for UUID
4. Otherwise, compose UUID from two parts:
1. part: converted first 8 bytes (which are hexadecimal digits) to lowercase
2. part: encoded following 4 bytes to their hexadecimal representation (16 bytes)
So UUID would always have 16 hexadecimal digits in lowercase variant.
According to UDF specification, first 16 Unicode characters of
VolumeSetIdentifier should be unique value and first 8 should be
hexadecimal characters.
In most cases all 16 characters are hexadecimal, but e.g. MS Windows
format.exe set only first 8 as hexadecimal and remaining as fixed
(non-unique) which violates specification.
UDF dstring has stored length in the last byte of buffer. Therefore last
byte is not part of recorded characters. And empty string in dstring is
encoded as empty buffer, including first byte (compression id).
Daniel Kiper