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Filename Latest commit message Latest commit date
Will Deacon 6e4ede698d arm64: percpu: Fix LSE implementation of value-returning pcpu atomics 
Commit 959bf2fd03 ("arm64: percpu: Rewrite per-cpu ops to allow use of
LSE atomics") introduced alternative code sequences for the arm64 percpu
atomics, so that the LSE instructions can be patched in at runtime if
they are supported by the CPU.

Unfortunately, when patching in the LSE sequence for a value-returning
pcpu atomic, the argument registers are the wrong way round. The
implementation of this_cpu_add_return() therefore ends up adding
uninitialised stack to the percpu variable and returning garbage.

As it turns out, there aren't very many users of the value-returning
percpu atomics in mainline and we only spotted this due to a failure in
the kprobes selftests. In this case, when attempting to single-step over
the out-of-line instruction slot, the debug monitors would not be
enabled because calling this_cpu_inc_return() on the kernel debug
monitor refcount would fail to detect the transition from 0. We would
consequently execute past the slot and take an undefined instruction
exception from the kernel, resulting in a BUG:

 | kernel BUG at arch/arm64/kernel/traps.c:421!
 | PREEMPT SMP
 | pc : do_undefinstr+0x268/0x278
 | lr : do_undefinstr+0x124/0x278
 | Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____))
 | Call trace:
 |  do_undefinstr+0x268/0x278
 |  el1_undef+0x10/0x78
 |  0xffff00000803c004
 |  init_kprobes+0x150/0x180
 |  do_one_initcall+0x74/0x178
 |  kernel_init_freeable+0x188/0x224
 |  kernel_init+0x10/0x100
 |  ret_from_fork+0x10/0x1c

Fix the argument order to get the value-returning pcpu atomics working
correctly when implemented using the LSE instructions.

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2018-12-12 14:43:35 +00:00
arch arm64: percpu: Fix LSE implementation of value-returning pcpu atomics 2018-12-12 14:43:35 +00:00
block SCSI: fix queue cleanup race before queue initialization is done 2018-11-14 08:19:10 -07:00
certs
crypto
Documentation arm64: Add configuration/documentation for Cortex-A76 erratum 1165522 2018-12-10 12:21:06 +00:00
drivers arm64: mm: Introduce DEFAULT_MAP_WINDOW 2018-12-10 18:42:17 +00:00
firmware
fs ocfs2: free up write context when direct IO failed 2018-11-18 10:15:09 -08:00
include Merge branch 'for-next/kexec' into aarch64/for-next/core 2018-12-10 18:57:17 +00:00
init
ipc
kernel kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump 2018-12-06 14:38:50 +00:00
lib lib/ubsan.c: don't mark __ubsan_handle_builtin_unreachable as noreturn 2018-11-18 10:15:10 -08:00
LICENSES
mm mm: mmap: Allow for "high" userspace addresses 2018-12-10 18:42:17 +00:00
net NFS client bugfixes for Linux 4.20 2018-11-15 10:59:37 -06:00
samples
scripts scripts/spdxcheck.py: make python3 compliant 2018-11-18 10:15:10 -08:00
security selinux/stable-4.20 PR 20181115 2018-11-15 11:26:09 -06:00
sound
tools libnvdimm 4.20-rc3 2018-11-18 12:21:09 -08:00
usr
virt KVM: arm64: Rework detection of SVE, !VHE systems 2018-12-10 11:57:52 +00:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS MAINTAINERS: update OMAP MMC entry 2018-11-18 10:15:09 -08:00
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: update OMAP MMC entry 2018-11-18 10:15:09 -08:00
Makefile Linux 4.20-rc3 2018-11-18 13:33:44 -08:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.