Pick up fixes before merging another batch of cpuidle updates.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

A subsequent fix for arm64 will use this parameter to parse the vma
information from the snapshot created by dump_vma_snapshot() rather than
traversing the vma list without the mmap_lock.

Fixes: 6dd8b1a0b6cb ("arm64: mte: Dump the MTE tags in the core file")
Cc: <stable@vger.kernel.org> # 5.18.x
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Seth Jenkins <sethjenkins@google.com>
Suggested-by: Seth Jenkins <sethjenkins@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221222181251.1345752-3-catalin.marinas@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

Export the rseq feature size supported by the kernel as well as the
required allocation alignment for the rseq per-thread area to user-space
through ELF auxiliary vector entries.

This is part of the extensible rseq ABI.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-3-mathieu.desnoyers@efficios.com

Pull elf coredumping updates from Al Viro:
 "Unification of regset and non-regset sides of ELF coredump handling.

  Collecting per-thread register values is the only thing that needs to
  be ifdefed there..."

* tag 'pull-elfcore' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  [elf] get rid of get_note_info_size()
  [elf] unify regset and non-regset cases
  [elf][non-regset] use elf_core_copy_task_regs() for dumper as well
  [elf][non-regset] uninline elf_core_copy_task_fpregs() (and lose pt_regs argument)
  elf_core_copy_task_regs(): task_pt_regs is defined everywhere
  [elf][regset] simplify thread list handling in fill_note_info()
  [elf][regset] clean fill_note_info() a bit
  kill extern of vsyscall32_sysctl
  kill coredump_params->regs
  kill signal_pt_regs()

it's trivial now...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

The only real difference is in filling per-thread notes - getting
the values of registers.   And this is the only part that is worth
an ifdef - we don't need to duplicate the logics regarding gathering
threads, filling other notes, etc.

It would've been hard to do back when regset-based variant had been
introduced, mostly due to sharing bits and pieces of helpers with
aout coredumps.  As the result, too much had been duplicated and
the copies had drifted away since then.  Now it can be done cleanly...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

elf_core_copy_regs() is equivalent to elf_core_copy_task_regs() of
current on all architectures.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Don't bother with pointless macros - we are not sharing it with aout coredumps
anymore.  Just convert the underlying functions to the same arguments (nobody
uses regs, actually) and call them elf_core_copy_task_fpregs().  And unexport
the entire bunch, while we are at it.

[added missing includes in arch/{csky,m68k,um}/kernel/process.c to avoid extra
warnings about the lack of externs getting added to huge piles for those
files.  Pointless, but...]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Avoid typecasts that are needed for IS_ERR() and use IS_ERR_VALUE()
instead.

Signed-off-by: Bo Liu <liubo03@inspur.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221115031757.2426-1-liubo03@inspur.com

The err variable was the same like retval, but capped to <= 0. This is the
same as retval as elf_read() never returns positive values.

Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/4137126.7Qn9TF0dmF@mobilepool36.emlix.com