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Josh Poimboeuf 0cb155717e x86/unwind/orc: Fix error handling in __unwind_start() 
commit 71c9582528 upstream.

The unwind_state 'error' field is used to inform the reliable unwinding
code that the stack trace can't be trusted.  Set this field for all
errors in __unwind_start().

Also, move the zeroing out of the unwind_state struct to before the ORC
table initialization check, to prevent the caller from reading
uninitialized data if the ORC table is corrupted.

Fixes: af085d9084 ("stacktrace/x86: add function for detecting reliable stack traces")
Fixes: d3a0910401 ("x86/unwinder/orc: Dont bail on stack overflow")
Fixes: 98d0c8ebf7 ("x86/unwind/orc: Prevent unwinding before ORC initialization")
Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/d6ac7215a84ca92b895fdd2e1aa546729417e6e6.1589487277.git.jpoimboe@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-20 08:17:16 +02:00
arch x86/unwind/orc: Fix error handling in __unwind_start() 2020-05-20 08:17:16 +02:00
block block, bfq: fix use-after-free in bfq_idle_slice_timer_body 2020-04-24 08:00:30 +02:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto gcc-10: avoid shadowing standard library 'free()' in crypto 2020-05-20 08:17:11 +02:00
Documentation ALSA: doc: Document PC Beep Hidden Register on Realtek ALC256 2020-04-24 08:00:35 +02:00
drivers usb: xhci: Fix NULL pointer dereference when enqueuing trbs from urb sg list 2020-05-20 08:17:16 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs f2fs: fix to avoid memory leakage in f2fs_listxattr 2020-05-20 08:17:04 +02:00
include x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:17:15 +02:00
init x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:17:15 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:17:07 +02:00
kernel Stop the ad-hoc games with -Wno-maybe-initialized 2020-05-20 08:17:10 +02:00
lib lib/mpi: Fix building for powerpc with clang 2020-05-10 10:29:01 +02:00
mm shmem: fix possible deadlocks on shmlock_user_lock 2020-05-20 08:17:04 +02:00
net net: tcp: fix rx timestamp behavior for tcp_recvmsg 2020-05-20 08:17:14 +02:00
samples samples/bpf: Don't try to remove user's homedir on clean 2020-02-14 16:32:13 -05:00
scripts scripts/decodecode: fix trapping instruction formatting 2020-05-20 08:17:01 +02:00
security selinux: properly handle multiple messages in selinux_netlink_send() 2020-05-05 19:15:53 +02:00
sound ALSA: usb-audio: Add control message quirk delay for Kingston HyperX headset 2020-05-20 08:17:15 +02:00
tools objtool: Fix stack offset tracking for indirect CFAs 2020-05-20 08:17:01 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: arm: vgic: Fix limit condition when writing to GICD_I[CS]ACTIVER 2020-05-20 08:16:58 +02:00
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MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile gcc-10: disable 'restrict' warning for now 2020-05-20 08:17:11 +02:00
README

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.