Fixup for d2ebd50d7f9740dcf30e84efc75610af173967d2
and 6920049fad4fa39db5fec712f82f7f75b98fd4b9:
- add a comment that the last arg must be NULL and adjust the assert.
- move initialization around so that fields are declared,
initialized, and consumed in the same order.
- move declaration of pos adjacent do declaration of command_line.
This makes it easy to see that it was not initialized correctly.
- initialize buffers before writing the pointer into the args array.
This makes no difference for the compiler, but it just feels "wrong"
to do it in opposite order.
Because pos was off, we would ignore args after the timeout, and also
overwrite the buffer if enough args were used.
I think this is case shows clearly that declaring all variables at the
top of the function, with some initialized and other not, is very
error-prone. The compiler has no issue with declaring variables whereever,
and we should take advantage of this to make it keep declaration,
initialization, and use close. (Within reason of course.)
This is a little helper I used when preparing the tests for auxv
parsing. Just looking at hexdump output is pretty hard. We could
enhance it to display some specific data types better.
So far we asked via a comment that @default should stay the first group
and @known the last group in the list. Let's enforce that statically, in
code, too.
seccomp-util: add new @sandbox syscall group with landlock/seccomp
Let's group these 4 syscalls, as they offer similar things and I guess
might be used in conjunction quite often, as they offer unprivileged
sandboxing.
No functional change. (We already checked for ELFCLASS32 or ELFCLASS64 before,
so even though there's a new check for other architectures, the only caller
only passes ELFCLASS32 or ELFCLASS64.)
Daan De Meyer [Thu, 23 Mar 2023 13:42:35 +0000 (14:42 +0100)]
loop-util: Add loop_device_make_by_path_at()
On top of taking a directory file descriptor, we use xopenat() so
that the function can also be used to work on existing file
descriptors to image files including all the logic to use O_DIRECT
and fallback to O_RDONLY if needed.
наб [Fri, 3 Mar 2023 14:57:42 +0000 (15:57 +0100)]
find-esp: don't silently error bootctl install if presumed XBOOTLDR part is stx_dev_major=0 but not btrfs
btrfs_get_block_device_fd() returns -ENOTTY if fstatfs().f_type !=
BTRFS_SUPER_MAGIC
btrfs_get_block_device_fd() is run by verify_fsroot_dir() by
verify_xbootldr() by find_xbootldr_and_warn() if
statx($presumed-XBOOTLDR).stx_dev_major == 0 ("maybe a btrfs device")
Every bootctl verb_install() runs find_xbootldr_and_warn(), by default
with /boot
If your /boot .stx_dev_major=0 but /not/ btrfs, bootctl install/update
quietly exits 1 with no note so as to what exactly failed (debug also
empty, and the strace isn't exactly clear since no syscall actually
failed)
This is the case on ZFS and the Debian filesystem layout: /boot/efi is
the ESP, and everything else under / is ZFS:
$ sudo env SYSTEMD_LOG_LEVEL=debug bootctl update
Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy
Found container virtualization none.
File system "/boot" is not a FAT EFI System Partition (ESP) file system.
Using EFI System Partition at /boot/efi.
Checking whether /boot/efi/EFI/systemd/ contains any files…
$ echo $?
1
and funnier still:
$ sudo bootctl update --graceful
$ echo $?
1
Which is great, and also breaks postinst, which runs precisely the
latter, with no feedback at all
By checking for -ENOTTY we accept that the path being investigated
"is not it" if it's on ZFS (and any other filesystem that returns
.stx_dev_major == 0 but isn't btrfs)
The auxv metadata is unaligned, as the length of the prefix
"COREDUMP_PROC_AUXV=" is 19. Hence, parse_auxv{32,64}() may triger
an undefined behavior (or at least cause slow down), which can be
detected when running on an undefined behavior sanitizer.
This also introduces a macro to define `parse_auxv{32,64}()`.
ukify: allow uncompressed kernel images for UNAME detection on aarch64 and riscv64 (#26929)
Uncompressed aarch64 and riscv64 kernels have a different startpoint than x86.
Example output from ukify:
aarch64: NotImplementedError: unknown file format (starts with b'MZ@\xfa')
riscv64: NotImplementedError: unknown file format (starts with b'MZo\x10')
Add check for (b'MZ') to catch both in one call.
Daan De Meyer [Mon, 20 Mar 2023 12:26:57 +0000 (13:26 +0100)]
core: Settle log target if we're going to be closing all fds
Whenever we're going to close all file descriptors, we tend to close
the log and set it into open when needed mode. When this is done with
the logging target set to LOG_TARGET_AUTO, we run into issues because
for every logging call, we'll check if stderr is connected to the
journal to determine where to send the logging message. This check
obviously stops working when we close stderr, so we settle the log
target before we do that so that we keep using the same logging
target even after stderr is closed.
Daan De Meyer [Sun, 19 Mar 2023 10:24:01 +0000 (11:24 +0100)]
execute: Add kernel cmdline arguments for tty term, rows and columns
Let's allow configuring tty term and size using kernel cmdline arguments
so that when running in a VM we can communicate the terminal TERM and size
from the host via SMBIOS extra kernel cmdline arguments.
Daan De Meyer [Tue, 14 Mar 2023 17:37:55 +0000 (18:37 +0100)]
chase-symlinks: Add CHASE_EXTRACT_FILENAME flag
Useful in combination with CHASE_PARENT to get a directory file
descriptor to the parent directory of the resolved path and the
filename of the resolved path in the parent directory (which might
not be the same as the filename of the input path because of symlinks).
Thomas Blume [Thu, 2 Mar 2023 11:06:13 +0000 (12:06 +0100)]
udev-rules: fix nvme symlink creation on namespace changes
The nvme by-id symlink changes to the latest namespace when a new namespace gets
added, for example by connecting multiple NVMe/TCP host controllers via nvme
connect-all.
That is incorrect for persistent device links.
The persistent symbolic device link should continue to point to the same NVMe
namespace throughout the lifetime of the current boot.
Therefore the namespace id needs to be added to the link name.
Daan De Meyer [Tue, 21 Mar 2023 13:51:56 +0000 (14:51 +0100)]
log: Add key/value support to the log context
Now that we have reference counting, it's useful to be able to push
single key values onto the log context separately, so that we don't
have to allocate new storage to join the separate string together into
a single field which means we won't be able to reuse a context containing
the same field.
Daan De Meyer [Tue, 21 Mar 2023 13:06:21 +0000 (14:06 +0100)]
log: Avoid pushing the same fields more than once on the log context
Let's try to optimize against pushing the same fields multiple times
onto the log context. To achieve this we make the log context reference
counted and return an existing context object if it's using the same
fields.
A consequence of this is that we have to make sure attaching/detaching
is coupled to the lifetime of the context object, so we make the attach
and detach functions private for now. If we need independent attach/detach
in the future, we can make that work with some extra complexity but since
we don't need it yet, let's not support it for now.
man/network-generator: replace dracut.kernel reference with dracut.cmdline
`dracut.kernel.7` is just a symlink to `dracut.cmdline.7`, so the web reference
points to a non-existent URL
(https://man7.org/linux/man-pages/man7/dracut.kernel.7.html).
projects / thirdparty / systemd.git / log
