linux.git/lib, branch v5.1-rc7

lib/test_vmalloc.c: do not create cpumask_t variable on stack

2019-04-26T16:18:05+00:00

On my "Intel(R) Xeon(R) W-2135 CPU @ 3.70GHz" system(12 CPUs) i get the
warning from the compiler about frame size:

   warning: the frame size of 1096 bytes is larger than 1024 bytes [-Wframe-larger-than=]

the size of cpumask_t depends on number of CPUs, therefore just make use
of cpumask_of() in set_cpus_allowed_ptr() as a second argument.

Link: http://lkml.kernel.org/r/20190418193925.9361-1-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) 
Reviewed-by: Andrew Morton 
Reviewed-by: Roman Gushchin 
Cc: Uladzislau Rezki 
Cc: Michal Hocko 
Cc: Matthew Wilcox 
Cc: Thomas Garnier 
Cc: Oleksiy Avramchenko 
Cc: Steven Rostedt 
Cc: Joel Fernandes 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: Tejun Heo 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lib/Kconfig.debug: fix build error without CONFIG_BLOCK

2019-04-26T16:18:05+00:00

If CONFIG_TEST_KMOD is set to M, while CONFIG_BLOCK is not set, XFS and
BTRFS can not be compiled successly.

Link: http://lkml.kernel.org/r/20190410075434.35220-1-yuehaibing@huawei.com
Fixes: d9c6a72d6fa2 ("kmod: add test driver to stress test the module loader")
Signed-off-by: YueHaibing 
Reported-by: Hulk Robot 
Reviewed-by: Kees Cook 
Cc: Masahiro Yamada 
Cc: Petr Mladek 
Cc: Andy Shevchenko 
Cc: Matthew Wilcox 
Cc: Joe Lawrence 
Cc: Robin Murphy 
Cc: Luis Chamberlain 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kcov: improve CONFIG_ARCH_HAS_KCOV help text

2019-04-19T16:46:05+00:00

The help text for CONFIG_ARCH_HAS_KCOV is stale, and describes the
feature as being enabled only for x86_64, when it is now enabled for
several architectures, including arm, arm64, powerpc, and s390.

Let's remove that stale help text, and update it along the lines of hat
for ARCH_HAS_FORTIFY_SOURCE, better describing when an architecture
should select CONFIG_ARCH_HAS_KCOV.

Link: http://lkml.kernel.org/r/20190412102733.5154-1-mark.rutland@arm.com
Signed-off-by: Mark Rutland 
Acked-by: Dmitry Vyukov 
Cc: Kees Cook 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2019-04-10T02:20:59+00:00

Pull misc fixes from Al Viro:
 "A few regression fixes from this cycle"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  aio: use kmem_cache_free() instead of kfree()
  iov_iter: Fix build error without CONFIG_CRYPTO
  aio: Fix an error code in __io_submit_one()

Merge branch 'akpm' (patches from Andrew)

2019-04-06T03:08:55+00:00

Merge misc fixes from Andrew Morton:
 "14 fixes"

* emailed patches from Andrew Morton :
  kernel/sysctl.c: fix out-of-bounds access when setting file-max
  mm/util.c: fix strndup_user() comment
  sh: fix multiple function definition build errors
  MAINTAINERS: add maintainer and replacing reviewer ARM/NUVOTON NPCM
  MAINTAINERS: fix bad pattern in ARM/NUVOTON NPCM
  mm: writeback: use exact memcg dirty counts
  psi: clarify the units used in pressure files
  mm/huge_memory.c: fix modifying of page protection by insert_pfn_pmd()
  hugetlbfs: fix memory leak for resv_map
  mm: fix vm_fault_t cast in VM_FAULT_GET_HINDEX()
  lib/lzo: fix bugs for very short or empty input
  include/linux/bitrev.h: fix constant bitrev
  kmemleak: powerpc: skip scanning holes in the .bss section
  lib/string.c: implement a basic bcmp

lib/lzo: fix bugs for very short or empty input

2019-04-06T02:02:30+00:00

For very short input data (0 - 1 bytes), lzo-rle was not behaving
correctly.  Fix this behaviour and update documentation accordingly.

For zero-length input, lzo v0 outputs an end-of-stream marker only,
which was misinterpreted by lzo-rle as a bitstream version number.
Ensure bitstream versions > 0 require a minimum stream length of 5.

Also fixes a bug in handling the tail for very short inputs when a
bitstream version is present.

Link: http://lkml.kernel.org/r/20190326165857.34613-1-dave.rodgman@arm.com
Signed-off-by: Dave Rodgman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lib/string.c: implement a basic bcmp

2019-04-06T02:02:30+00:00

A recent optimization in Clang (r355672) lowers comparisons of the
return value of memcmp against zero to comparisons of the return value
of bcmp against zero.  This helps some platforms that implement bcmp
more efficiently than memcmp.  glibc simply aliases bcmp to memcmp, but
an optimized implementation is in the works.

This results in linkage failures for all targets with Clang due to the
undefined symbol.  For now, just implement bcmp as a tailcail to memcmp
to unbreak the build.  This routine can be further optimized in the
future.

Other ideas discussed:

 * A weak alias was discussed, but breaks for architectures that define
   their own implementations of memcmp since aliases to declarations are
   not permitted (only definitions). Arch-specific memcmp
   implementations typically declare memcmp in C headers, but implement
   them in assembly.

 * -ffreestanding also is used sporadically throughout the kernel.

 * -fno-builtin-bcmp doesn't work when doing LTO.

Link: https://bugs.llvm.org/show_bug.cgi?id=41035
Link: https://code.woboq.org/userspace/glibc/string/memcmp.c.html#bcmp
Link: https://github.com/llvm/llvm-project/commit/8e16d73346f8091461319a7dfc4ddd18eedcff13
Link: https://github.com/ClangBuiltLinux/linux/issues/416
Link: http://lkml.kernel.org/r/20190313211335.165605-1-ndesaulniers@google.com
Signed-off-by: Nick Desaulniers 
Reported-by: Nathan Chancellor 
Reported-by: Adhemerval Zanella 
Suggested-by: Arnd Bergmann 
Suggested-by: James Y Knight 
Suggested-by: Masahiro Yamada 
Suggested-by: Nathan Chancellor 
Suggested-by: Rasmus Villemoes 
Acked-by: Steven Rostedt (VMware) 
Reviewed-by: Nathan Chancellor 
Tested-by: Nathan Chancellor 
Reviewed-by: Masahiro Yamada 
Reviewed-by: Andy Shevchenko 
Cc: David Laight 
Cc: Rasmus Villemoes 
Cc: Namhyung Kim 
Cc: Greg Kroah-Hartman 
Cc: Alexander Shishkin 
Cc: Dan Williams 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

syscalls: Remove start and number from syscall_get_arguments() args

2019-04-05T13:26:43+00:00

At Linux Plumbers, Andy Lutomirski approached me and pointed out that the
function call syscall_get_arguments() implemented in x86 was horribly
written and not optimized for the standard case of passing in 0 and 6 for
the starting index and the number of system calls to get. When looking at
all the users of this function, I discovered that all instances pass in only
0 and 6 for these arguments. Instead of having this function handle
different cases that are never used, simply rewrite it to return the first 6
arguments of a system call.

This should help out the performance of tracing system calls by ptrace,
ftrace and perf.

Link: http://lkml.kernel.org/r/20161107213233.754809394@goodmis.org

Cc: Oleg Nesterov 
Cc: Kees Cook 
Cc: Andy Lutomirski 
Cc: Dominik Brodowski 
Cc: Dave Martin 
Cc: "Dmitry V. Levin" 
Cc: x86@kernel.org
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-c6x-dev@linux-c6x.org
Cc: uclinux-h8-devel@lists.sourceforge.jp
Cc: linux-hexagon@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: nios2-dev@lists.rocketboards.org
Cc: openrisc@lists.librecores.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-riscv@lists.infradead.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-um@lists.infradead.org
Cc: linux-xtensa@linux-xtensa.org
Cc: linux-arch@vger.kernel.org
Acked-by: Paul Burton  # MIPS parts
Acked-by: Max Filippov  # For xtensa changes
Acked-by: Will Deacon  # For the arm64 bits
Reviewed-by: Thomas Gleixner  # for x86
Reviewed-by: Dmitry V. Levin 
Reported-by: Andy Lutomirski 
Signed-off-by: Steven Rostedt (VMware)

ptrace: Remove maxargs from task_current_syscall()

2019-04-04T13:17:15+00:00

task_current_syscall() has a single user that passes in 6 for maxargs, which
is the maximum arguments that can be used to get system calls from
syscall_get_arguments(). Instead of passing in a number of arguments to
grab, just get 6 arguments. The args argument even specifies that it's an
array of 6 items.

This will also allow changing syscall_get_arguments() to not get a variable
number of arguments, but always grab 6.

Linus also suggested not passing in a bunch of arguments to
task_current_syscall() but to instead pass in a pointer to a structure, and
just fill the structure. struct seccomp_data has almost all the parameters
that is needed except for the stack pointer (sp). As seccomp_data is part of
uapi, and I'm afraid to change it, a new structure was created
"syscall_info", which includes seccomp_data and adds the "sp" field.

Link: http://lkml.kernel.org/r/20161107213233.466776454@goodmis.org

Cc: Andy Lutomirski 
Cc: Alexey Dobriyan 
Cc: Oleg Nesterov 
Cc: Kees Cook 
Cc: Al Viro 
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Thomas Gleixner 
Signed-off-by: Steven Rostedt (VMware)

iov_iter: Fix build error without CONFIG_CRYPTO

2019-04-04T02:37:41+00:00

If CONFIG_CRYPTO is not set or set to m,
gcc building warn this:

lib/iov_iter.o: In function `hash_and_copy_to_iter':
iov_iter.c:(.text+0x9129): undefined reference to `crypto_stats_get'
iov_iter.c:(.text+0x9152): undefined reference to `crypto_stats_ahash_update'

Reported-by: Hulk Robot 
Fixes: d05f443554b3 ("iov_iter: introduce hash_and_copy_to_iter helper")
Suggested-by: Al Viro 
Signed-off-by: YueHaibing 
Signed-off-by: Al Viro