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The current raw_clone function takes two arguments, the cloning flags and
a pointer to the stack for the cloned child. The raw cloning without
passing a "thread main" function does not make sense if a new stack is
specified, as it returns in both the parent and the child, which will fail
in the child as the stack is virgin. All uses of raw_clone indeed pass NULL
for the stack pointer which indicates that both processes should share the
stack address (so you better don't pass CLONE_VM).
This commit refactors the code to not require the caller to pass the stack
address, as NULL is the only sensible option. It also adds the magic code
needed to make raw_clone work on sparc64, which does not return 0 in %o0
for the child, but indicates the child process by setting %o1 to non-zero.
This refactoring is not plain aesthetic, because non-NULL stack addresses
need to get mangled before being passed to the clone syscall (you have to
apply STACK_BIAS), whereas NULL must not be mangled. Implementing the
conditional mangling of the stack address would needlessly complicate the
code.
raw_clone is moved to a separete header, because the burden of including
the assert machinery and sched.h shouldn't be applied to every user of
missing_syscalls.h
unit_write_drop_in{,_private}{,_format} are all affected.
We already append a header to the file (and section markers), so those functions
can only be used to write a whole file at once. Including the newline at
the end feels natural.
After this commit newlines will be duplicated. They will be removed in
subsequent commit.
Also, rewrap the "autogenerated" header to fit within 80 columns.
We need to explicitly define authorizations for allow_inactive and
allow_active. Otherwise one is getting "Access denied" when run from a
local console:
$ loginctl enable-linger
Could not enable linger: Access denied
On the unified hierarchy, memory controller implements three control knobs -
low, high and max which enables more useable and versatile control over memory
usage. This patch implements support for the three control knobs.
* MemoryLow, MemoryHigh and MemoryMax are added for memory.low, memory.high and
memory.max, respectively.
* As all absolute limits on the unified hierarchy use "max" for no limit, make
memory limit parse functions accept "max" in addition to "infinity" and
document "max" for the new knobs.
* Implement compatibility translation between MemoryMax and MemoryLimit.
v2:
- Fixed missing else's in config_parse_memory_limit().
- Fixed missing newline when writing out drop-ins.
- Coding style updates to use "val > 0" instead of "val".
- Minor updates to documentation.
Split seccomp into nspawn-seccomp.[ch]. Currently there are no changes,
but this will make it easy in the future to share or use the seccomp logic
from systemd core.
Rename is_procfs_sysfs_or_suchlike() to is_fs_fully_userns_compatible()
to give it the real meaning. This may prevent future modifications that
may introduce bugs.
We have to pass addresses of changes and n_changes to
bus_deserialize_and_dump_unit_file_changes(). Otherwise we are hit by
missing information (subsequent calls to unit_file_changes_add() to
not add anything).
Also prevent null pointer dereference in
bus_deserialize_and_dump_unit_file_changes() by asserting.
Fixes#3339
Let's better check the size before we subtract. Also, let's change the size
argument to size_t, as it cannot be signed anyway.
Finally, use EBADMSG for indicating invalid packets, like we do everywhere
else.
There's no "client" object, in both cases. There's only "nd".
This wasn't noticed before, as the context object is currently not actually
used by the log macros.
Let's make the seed actually work as stable seed, and use siphash24 to generate
the series of addresses, instead of the opaque libc random_r().
This not only makes the seed truly work as stable, portable seed, but also
makes the code quite a bit shorter, and removes a couple of memory allocations.
We try to stick to usec_t for encoding time information, do that here too. In
particular, get rid of "int" second specifications, since signed timespans are
a weird thing.
