Merge tag 'asoc-fix-v6.13-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v6.13

A few small fixes for v6.13, all system specific - the biggest t

Merge tag 'asoc-fix-v6.13-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v6.13

A few small fixes for v6.13, all system specific - the biggest thing is
the fix for jack handling over suspend on some Intel laptops.

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Merge branch 'ovl.fixes'

Bring in an overlayfs fix for v6.13-rc1 that fixes a bug introduced by
the overlayfs changes merged for v6.13.

Signed-off-by: Christian Brauner <brauner@kernel.org>

Merge tag 'linux_kselftest-next-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest update from Shuah Khan:
"timer test:
- remove duplicate defines

Merge tag 'linux_kselftest-next-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest update from Shuah Khan:
"timer test:
- remove duplicate defines
- fixes to improve error reporting

rtc test:
- check rtc alarm status in alarm test

resctrl test:
- add array overrun checks during iMC config parsing code and when
reading strings
- fixes and reorganizing code"

* tag 'linux_kselftest-next-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (23 commits)
selftests/resctrl: Replace magic constants used as array size
selftests/resctrl: Keep results from first test run
selftests/resctrl: Do not compare performance counters and resctrl at low bandwidth
selftests/resctrl: Use cache size to determine "fill_buf" buffer size
selftests/resctrl: Ensure measurements skip initialization of default benchmark
selftests/resctrl: Make benchmark parameter passing robust
selftests/resctrl: Remove unused measurement code
selftests/resctrl: Only support measured read operation
selftests/resctrl: Remove "once" parameter required to be false
selftests/resctrl: Make wraparound handling obvious
selftests/resctrl: Protect against array overflow when reading strings
selftests/resctrl: Protect against array overrun during iMC config parsing
selftests/resctrl: Fix memory overflow due to unhandled wraparound
selftests/resctrl: Print accurate buffer size as part of MBM results
selftests/resctrl: Make functions only used in same file static
selftests: Add a test mangling with uc_sigmask
selftests: Rename sigaltstack to generic signal
selftest: rtc: Add to check rtc alarm status for alarm related test
selftests:timers: remove local CLOCKID defines
selftests: timers: Remove unneeded semicolon
...

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selftests: Add a test mangling with uc_sigmask

The test is motivated by the following observation:

Raise a signal, jump to signal handler. The ucontext_t structure dumped
by kernel to userspace has

selftests: Add a test mangling with uc_sigmask

The test is motivated by the following observation:

Raise a signal, jump to signal handler. The ucontext_t structure dumped
by kernel to userspace has a uc_sigmask field having the mask of blocked
signals. If you run a fresh minimalistic program doing this, this field
is empty, even if you block some signals while registering the handler
with sigaction().

Here is what the man-pages have to say:

sigaction(2): "sa_mask specifies a mask of signals which should be blocked
(i.e., added to the signal mask of the thread in which the signal handler
is invoked) during execution of the signal handler. In addition, the
signal which triggered the handler will be blocked, unless the SA_NODEFER
flag is used."

signal(7): Under "Execution of signal handlers", (1.3) implies:

"The thread's current signal mask is accessible via the ucontext_t
object that is pointed to by the third argument of the signal handler."

But, (1.4) states:

"Any signals specified in act->sa_mask when registering the handler with
sigprocmask(2) are added to the thread's signal mask. The signal being
delivered is also added to the signal mask, unless SA_NODEFER was
specified when registering the handler. These signals are thus blocked
while the handler executes."

There clearly is no distinction being made in the man pages between
"Thread's signal mask" and ucontext_t; this logically should imply
that a signal blocked by populating struct sigaction should be visible
in ucontext_t.

Here is what the kernel code does (for Aarch64):

do_signal() -> handle_signal() -> sigmask_to_save(), which returns
&current->blocked, is passed to setup_rt_frame() -> setup_sigframe() ->
__copy_to_user(). Hence, &current->blocked is copied to ucontext_t
exposed to userspace. Returning back to handle_signal(),
signal_setup_done() -> signal_delivered() -> sigorsets() and
set_current_blocked() are responsible for using information from
struct ksignal ksig, which was populated through the sigaction()
system call in kernel/signal.c:
copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)),
to update &current->blocked; hence, the set of blocked signals for the
current thread is updated AFTER the kernel dumps ucontext_t to
userspace.

Assuming that the above is indeed the intended behaviour, because it
semantically makes sense, since the signals blocked using sigaction()
remain blocked only till the execution of the handler, and not in the
context present before jumping to the handler (but nothing can be
confirmed from the man-pages), this patch introduces a test for
mangling with uc_sigmask.

The test asserts the relation between blocked signal, delivered signal,
and ucontext. The ucontext is mangled with, by adding a signal mask to
it; on return from the handler, the thread must block the corresponding
signal.

In the test description, I have also described signal delivery and blockage,
for ease of understanding what the test does.

Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

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selftests: Rename sigaltstack to generic signal

Rename sigaltstack to generic signal directory, to allow adding more
signal tests in the future.

Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-

selftests: Rename sigaltstack to generic signal

Rename sigaltstack to generic signal directory, to allow adding more
signal tests in the future.

Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

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