linux.git/arch/sh/kernel, branch v5.9

sh: fix syscall tracing

2020-09-14T01:22:55+00:00

Addition of SECCOMP_FILTER exposed a longstanding bug in
do_syscall_trace_enter, whereby r0 (the 5th argument register) was
mistakenly used where r3 (syscall_nr) was intended. By overwriting r0
rather than r3 with -1 when attempting to block a syscall, the
existing code would instead have caused the syscall to execute with an
argument clobbered.

Commit 0bb605c2c7f2b4b3 then introduced skipping of the syscall when
do_syscall_trace_enter returns -1, so that the return value set by
seccomp filters would not be clobbered by -ENOSYS. This eliminated the
clobbering of the 5th argument register, but instead caused syscalls
made with a 5th argument of -1 to be misinterpreted as a request by
do_syscall_trace_enter to suppress the syscall.

Fixes: 0bb605c2c7f2b4b3 ("sh: Add SECCOMP_FILTER")
Fixes: ab99c733ae73cce3 ("sh: Make syscall tracer use tracehook notifiers, add TIF_NOTIFY_RESUME.")
Tested-by: John Paul Adrian Glaubitz 
Signed-off-by: Rich Felker

treewide: Use fallthrough pseudo-keyword

2020-08-23T22:36:59+00:00

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva

Merge tag 'sh-for-5.9' of git://git.libc.org/linux-sh

2020-08-16T01:50:32+00:00

Pull arch/sh updates from Rich Felker:
 "Cleanup, SECCOMP_FILTER support, message printing fixes, and other
  changes to arch/sh"

* tag 'sh-for-5.9' of git://git.libc.org/linux-sh: (34 commits)
  sh: landisk: Add missing initialization of sh_io_port_base
  sh: bring syscall_set_return_value in line with other architectures
  sh: Add SECCOMP_FILTER
  sh: Rearrange blocks in entry-common.S
  sh: switch to copy_thread_tls()
  sh: use the generic dma coherent remap allocator
  sh: don't allow non-coherent DMA for NOMMU
  dma-mapping: consolidate the NO_DMA definition in kernel/dma/Kconfig
  sh: unexport register_trapped_io and match_trapped_io_handler
  sh: don't include  in 
  sh: move the ioremap implementation out of line
  sh: move ioremap_fixed details out of 
  sh: remove __KERNEL__ ifdefs from non-UAPI headers
  sh: sort the selects for SUPERH alphabetically
  sh: remove -Werror from Makefiles
  sh: Replace HTTP links with HTTPS ones
  arch/sh/configs: remove obsolete CONFIG_SOC_CAMERA*
  sh: stacktrace: Remove stacktrace_ops.stack()
  sh: machvec: Modernize printing of kernel messages
  sh: pci: Modernize printing of kernel messages
  ...

iomap: constify ioreadX() iomem argument (as in generic implementation)

2020-08-15T02:56:57+00:00

Patch series "iomap: Constify ioreadX() iomem argument", v3.

The ioread8/16/32() and others have inconsistent interface among the
architectures: some taking address as const, some not.

It seems there is nothing really stopping all of them to take pointer to
const.

This patch (of 4):

The ioreadX() and ioreadX_rep() helpers have inconsistent interface.  On
some architectures void *__iomem address argument is a pointer to const,
on some not.

Implementations of ioreadX() do not modify the memory under the address so
they can be converted to a "const" version for const-safety and
consistency among architectures.

[krzk@kernel.org: sh: clk: fix assignment from incompatible pointer type for ioreadX()]
  Link: http://lkml.kernel.org/r/20200723082017.24053-1-krzk@kernel.org
[akpm@linux-foundation.org: fix drivers/mailbox/bcm-pdc-mailbox.c]
  Link: http://lkml.kernel.org/r/202007132209.Rxmv4QyS%25lkp@intel.com

Suggested-by: Geert Uytterhoeven 
Signed-off-by: Krzysztof Kozlowski 
Signed-off-by: Andrew Morton 
Reviewed-by: Geert Uytterhoeven 
Reviewed-by: Arnd Bergmann 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Matt Turner 
Cc: "James E.J. Bottomley" 
Cc: Helge Deller 
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Yoshinori Sato 
Cc: Rich Felker 
Cc: Kalle Valo 
Cc: "David S. Miller" 
Cc: Jakub Kicinski 
Cc: Dave Jiang 
Cc: Jon Mason 
Cc: Allen Hubbe 
Cc: "Michael S. Tsirkin" 
Cc: Jason Wang 
Link: http://lkml.kernel.org/r/20200709072837.5869-1-krzk@kernel.org
Link: http://lkml.kernel.org/r/20200709072837.5869-2-krzk@kernel.org
Signed-off-by: Linus Torvalds

all arch: remove system call sys_sysctl

2020-08-15T02:56:56+00:00

Since commit 61a47c1ad3a4dc ("sysctl: Remove the sysctl system call"),
sys_sysctl is actually unavailable: any input can only return an error.

We have been warning about people using the sysctl system call for years
and believe there are no more users.  Even if there are users of this
interface if they have not complained or fixed their code by now they
probably are not going to, so there is no point in warning them any
longer.

So completely remove sys_sysctl on all architectures.

[nixiaoming@huawei.com: s390: fix build error for sys_call_table_emu]
 Link: http://lkml.kernel.org/r/20200618141426.16884-1-nixiaoming@huawei.com

Signed-off-by: Xiaoming Ni 
Signed-off-by: Andrew Morton 
Acked-by: Will Deacon 		[arm/arm64]
Acked-by: "Eric W. Biederman" 
Cc: Aleksa Sarai 
Cc: Alexander Shishkin 
Cc: Al Viro 
Cc: Andi Kleen 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Arnaldo Carvalho de Melo 
Cc: Arnd Bergmann 
Cc: Benjamin Herrenschmidt 
Cc: Bin Meng 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Catalin Marinas 
Cc: chenzefeng 
Cc: Christian Borntraeger 
Cc: Christian Brauner 
Cc: Chris Zankel 
Cc: David Howells 
Cc: David S. Miller 
Cc: Diego Elio Pettenò 
Cc: Dmitry Vyukov 
Cc: Dominik Brodowski 
Cc: Fenghua Yu 
Cc: Geert Uytterhoeven 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Iurii Zaikin 
Cc: Ivan Kokshaysky 
Cc: James Bottomley 
Cc: Jens Axboe 
Cc: Jiri Olsa 
Cc: Kars de Jong 
Cc: Kees Cook 
Cc: Krzysztof Kozlowski 
Cc: Luis Chamberlain 
Cc: Marco Elver 
Cc: Mark Rutland 
Cc: Martin K. Petersen 
Cc: Masahiro Yamada 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Miklos Szeredi 
Cc: Minchan Kim 
Cc: Namhyung Kim 
Cc: Naveen N. Rao 
Cc: Nick Piggin 
Cc: Oleg Nesterov 
Cc: Olof Johansson 
Cc: Paul Burton 
Cc: "Paul E. McKenney" 
Cc: Paul Mackerras 
Cc: Peter Zijlstra (Intel) 
Cc: Randy Dunlap 
Cc: Ravi Bangoria 
Cc: Richard Henderson 
Cc: Rich Felker 
Cc: Russell King 
Cc: Sami Tolvanen 
Cc: Sargun Dhillon 
Cc: Stephen Rothwell 
Cc: Sudeep Holla 
Cc: Sven Schnelle 
Cc: Thiago Jung Bauermann 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: Vasily Gorbik 
Cc: Vlastimil Babka 
Cc: Yoshinori Sato 
Cc: Zhou Yanjie 
Link: http://lkml.kernel.org/r/20200616030734.87257-1-nixiaoming@huawei.com
Signed-off-by: Linus Torvalds

sh: Add SECCOMP_FILTER

2020-08-15T02:05:19+00:00

Port sh to use the new SECCOMP_FILTER code.

Signed-off-by: Michael Karcher 
Tested-by: John Paul Adrian Glaubitz 
Signed-off-by: Rich Felker

sh: Rearrange blocks in entry-common.S

2020-08-15T02:05:19+00:00

This avoids out-of-range jumps that get auto-replaced by the assembler
and prepares for the changes needed to implement SECCOMP_FILTER cleanly.

Signed-off-by: Michael Karcher 
Tested-by: John Paul Adrian Glaubitz 
Signed-off-by: Rich Felker

sh: switch to copy_thread_tls()

2020-08-15T02:05:18+00:00

Use the copy_thread_tls() calling convention which passes tls through a
register. This is required so we can remove the copy_thread{_tls}() split
and remove the HAVE_COPY_THREAD_TLS macro.

Cc: Rich Felker 
Cc: Yoshinori Sato 
Cc: linux-sh@vger.kernel.org
Signed-off-by: Christian Brauner 
Signed-off-by: Rich Felker

sh: use the generic dma coherent remap allocator

2020-08-15T02:05:18+00:00

This switches to using common code for the DMA allocations, including
potential use of the CMA allocator if configured.

Switching to the generic code enables DMA allocations from atomic
context, which is required by the DMA API documentation, and also
adds various other minor features drivers start relying upon.  It
also makes sure we have on tested code base for all architectures
that require uncached pte bits for coherent DMA allocations.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Rich Felker

sh: unexport register_trapped_io and match_trapped_io_handler

2020-08-15T02:05:16+00:00

Both functions are only used by compiled in core code.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Rich Felker