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Author SHA1 Message Date
Isaac J. Manjarres
a7ea4f03e5 lib: ubsan: Fix compilation issues for ubsan 
Currently, multiple declarations of data structures and
functions exist, as well as dead code that was meant to be
removed earlier. Remove dead code and multiple declarations
for ubsan.

Change-Id: I2b1d27ab2edc9852a3cd286c70fe8990aa0e0754
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
 2018-03-09 11:30:09 -08:00
Isaac J. Manjarres
2ba985d87a Merge remote-tracking branch 'remotes/origin/tmp-0a91e84' into msm-4.14 
* remotes/origin/tmp-0a91e84:
  Linux 4.14.20
  scsi: cxlflash: Reset command ioasc
  scsi: lpfc: Fix crash after bad bar setup on driver attachment
  rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules
  scsi: core: Ensure that the SCSI error handler gets woken up
  ftrace: Remove incorrect setting of glob search field
  devpts: fix error handling in devpts_mntget()
  mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy
  ovl: take mnt_want_write() for removing impure xattr
  ovl: fix failure to fsync lower dir
  acpi, nfit: fix register dimm error handling
  ACPI: sbshc: remove raw pointer from printk() message
  drm/i915: Avoid PPS HW/SW state mismatch due to rounding
  arm64: dts: marvell: add Ethernet aliases
  objtool: Fix switch-table detection
  btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker
  lib/ubsan: add type mismatch handler for new GCC/Clang
  lib/ubsan.c: s/missaligned/misaligned/
  clocksource/drivers/stm32: Fix kernel panic with multiple timers
  blk-mq: quiesce queue before freeing queue
  pktcdvd: Fix a recently introduced NULL pointer dereference
  pktcdvd: Fix pkt_setup_dev() error path
  pinctrl: sx150x: Add a static gpio/pinctrl pin range mapping
  pinctrl: sx150x: Register pinctrl before adding the gpiochip
  pinctrl: sx150x: Unregister the pinctrl on release
  pinctrl: mcp23s08: fix irq setup order
  pinctrl: intel: Initialize GPIO properly when used through irqchip
  EDAC, octeon: Fix an uninitialized variable warning
  xtensa: fix futex_atomic_cmpxchg_inatomic
  alpha: fix formating of stack content
  alpha: fix reboot on Avanti platform
  alpha: Fix mixed up args in EXC macro in futex operations
  alpha: osf_sys.c: fix put_tv32 regression
  alpha: fix crash if pthread_create races with signal delivery
  signal/sh: Ensure si_signo is initialized in do_divide_error
  signal/openrisc: Fix do_unaligned_access to send the proper signal
  ipmi: use dynamic memory for DMI driver override
  Bluetooth: btusb: Restore QCA Rome suspend/resume fix with a "rewritten" version
  Revert "Bluetooth: btusb: fix QCA Rome suspend/resume"
  Bluetooth: btsdio: Do not bind to non-removable BCM43341
  HID: quirks: Fix keyboard + touchpad on Toshiba Click Mini not working
  pipe: fix off-by-one error when checking buffer limits
  pipe: actually allow root to exceed the pipe buffer limits
  kernel/relay.c: revert "kernel/relay.c: fix potential memory leak"
  kernel/async.c: revert "async: simplify lowest_in_progress()"
  fs/proc/kcore.c: use probe_kernel_read() instead of memcpy()
  media: cxusb, dib0700: ignore XC2028_I2C_FLUSH
  media: ts2020: avoid integer overflows on 32 bit machines
  media: dvb-frontends: fix i2c access helpers for KASAN
  kasan: rework Kconfig settings
  kasan: don't emit builtin calls when sanitization is off
  Btrfs: raid56: iterate raid56 internal bio with bio_for_each_segment_all
  watchdog: imx2_wdt: restore previous timeout after suspend+resume
  ASoC: skl: Fix kernel warning due to zero NHTL entry
  ASoC: rockchip: i2s: fix playback after runtime resume
  KVM: PPC: Book3S PR: Fix broken select due to misspelling
  KVM: arm/arm64: Handle CPU_PM_ENTER_FAILED
  KVM: PPC: Book3S HV: Drop locks before reading guest memory
  KVM: PPC: Book3S HV: Make sure we don't re-enter guest without XIVE loaded
  KVM: nVMX: Fix bug of injecting L2 exception into L1
  KVM: nVMX: Fix races when sending nested PI while dest enters/leaves L2
  arm: KVM: Fix SMCCC handling of unimplemented SMC/HVC calls
  crypto: sha512-mb - initialize pending lengths correctly
  crypto: caam - fix endless loop when DECO acquire fails
  media: v4l2-compat-ioctl32.c: make ctrl_is_pointer work for subdevs
  media: v4l2-compat-ioctl32.c: refactor compat ioctl32 logic
  media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors
  media: v4l2-compat-ioctl32.c: drop pr_info for unknown buffer type
  media: v4l2-compat-ioctl32.c: copy clip list in put_v4l2_window32
  media: v4l2-compat-ioctl32.c: fix ctrl_is_pointer
  media: v4l2-compat-ioctl32.c: copy m.userptr in put_v4l2_plane32
  media: v4l2-compat-ioctl32.c: avoid sizeof(type)
  media: v4l2-compat-ioctl32.c: move 'helper' functions to __get/put_v4l2_format32
  media: v4l2-compat-ioctl32.c: fix the indentation
  media: v4l2-compat-ioctl32.c: add missing VIDIOC_PREPARE_BUF
  media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
  media: v4l2-ioctl.c: use check_fmt for enum/g/s/try_fmt
  crypto: hash - prevent using keyed hashes without setting key
  crypto: hash - annotate algorithms taking optional key
  crypto: poly1305 - remove ->setkey() method
  crypto: mcryptd - pass through absence of ->setkey()
  crypto: cryptd - pass through absence of ->setkey()
  crypto: hash - introduce crypto_hash_alg_has_setkey()
  ahci: Add Intel Cannon Lake PCH-H PCI ID
  ahci: Add PCI ids for Intel Bay Trail, Cherry Trail and Apollo Lake AHCI
  ahci: Annotate PCI ids for mobile Intel chipsets as such
  kernfs: fix regression in kernfs_fop_write caused by wrong type
  NFS: Fix a race between mmap() and O_DIRECT
  NFS: reject request for id_legacy key without auxdata
  NFS: commit direct writes even if they fail partially
  NFS: Fix nfsstat breakage due to LOOKUPP
  NFS: Add a cond_resched() to nfs_commit_release_pages()
  nfs41: do not return ENOMEM on LAYOUTUNAVAILABLE
  nfs/pnfs: fix nfs_direct_req ref leak when i/o falls back to the mds
  ubifs: free the encrypted symlink target
  ubi: block: Fix locking for idr_alloc/idr_remove
  ubi: fastmap: Erase outdated anchor PEBs during attach
  ubi: Fix race condition between ubi volume creation and udev
  mtd: nand: sunxi: Fix ECC strength choice
  mtd: nand: Fix nand_do_read_oob() return value
  mtd: nand: brcmnand: Disable prefetch by default
  mtd: cfi: convert inline functions to macros
  arm64: Kill PSCI_GET_VERSION as a variant-2 workaround
  arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support
  arm/arm64: smccc: Implement SMCCC v1.1 inline primitive
  arm/arm64: smccc: Make function identifiers an unsigned quantity
  firmware/psci: Expose SMCCC version through psci_ops
  firmware/psci: Expose PSCI conduit
  arm64: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling
  arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support
  arm/arm64: KVM: Turn kvm_psci_version into a static inline
  arm64: KVM: Make PSCI_VERSION a fast path
  arm/arm64: KVM: Advertise SMCCC v1.1
  arm/arm64: KVM: Implement PSCI 1.0 support
  arm/arm64: KVM: Add smccc accessors to PSCI code
  arm/arm64: KVM: Add PSCI_VERSION helper
  arm/arm64: KVM: Consolidate the PSCI include files
  arm64: KVM: Increment PC after handling an SMC trap
  arm64: Branch predictor hardening for Cavium ThunderX2
  arm64: Implement branch predictor hardening for Falkor
  arm64: Implement branch predictor hardening for affected Cortex-A CPUs
  arm64: cputype: Add missing MIDR values for Cortex-A72 and Cortex-A75
  arm64: entry: Apply BP hardening for suspicious interrupts from EL0
  arm64: entry: Apply BP hardening for high-priority synchronous exceptions
  arm64: KVM: Use per-CPU vector when BP hardening is enabled
  arm64: Move BP hardening to check_and_switch_context
  arm64: Add skeleton to harden the branch predictor against aliasing attacks
  arm64: Move post_ttbr_update_workaround to C code
  drivers/firmware: Expose psci_get_version through psci_ops structure
  arm64: cpufeature: Pass capability structure to ->enable callback
  arm64: Run enable method for errata work arounds on late CPUs
  arm64: cpufeature: __this_cpu_has_cap() shouldn't stop early
  arm64: futex: Mask __user pointers prior to dereference
  arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user
  arm64: uaccess: Don't bother eliding access_ok checks in __{get, put}_user
  arm64: uaccess: Prevent speculative use of the current addr_limit
  arm64: entry: Ensure branch through syscall table is bounded under speculation
  arm64: Use pointer masking to limit uaccess speculation
  arm64: Make USER_DS an inclusive limit
  arm64: Implement array_index_mask_nospec()
  arm64: barrier: Add CSDB macros to control data-value prediction
  arm64: idmap: Use "awx" flags for .idmap.text .pushsection directives
  arm64: entry: Reword comment about post_ttbr_update_workaround
  arm64: Force KPTI to be disabled on Cavium ThunderX
  arm64: kpti: Add ->enable callback to remap swapper using nG mappings
  arm64: mm: Permit transitioning from Global to Non-Global without BBM
  arm64: kpti: Make use of nG dependent on arm64_kernel_unmapped_at_el0()
  arm64: Turn on KPTI only on CPUs that need it
  arm64: cputype: Add MIDR values for Cavium ThunderX2 CPUs
  arm64: kpti: Fix the interaction between ASID switching and software PAN
  arm64: mm: Introduce TTBR_ASID_MASK for getting at the ASID in the TTBR
  arm64: capabilities: Handle duplicate entries for a capability
  arm64: Take into account ID_AA64PFR0_EL1.CSV3
  arm64: Kconfig: Reword UNMAP_KERNEL_AT_EL0 kconfig entry
  arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0
  arm64: use RET instruction for exiting the trampoline
  arm64: kaslr: Put kernel vectors address in separate data page
  arm64: entry: Add fake CPU feature for unmapping the kernel at EL0
  arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks
  arm64: cpu_errata: Add Kryo to Falkor 1003 errata
  arm64: erratum: Work around Falkor erratum #E1003 in trampoline code
  arm64: entry: Hook up entry trampoline to exception vectors
  arm64: entry: Explicitly pass exception level to kernel_ventry macro
  arm64: mm: Map entry trampoline into trampoline and kernel page tables
  arm64: entry: Add exception trampoline page for exceptions from EL0
  arm64: mm: Invalidate both kernel and user ASIDs when performing TLBI
  arm64: mm: Add arm64_kernel_unmapped_at_el0 helper
  arm64: mm: Allocate ASIDs in pairs
  arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN
  arm64: mm: Rename post_ttbr0_update_workaround
  arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum #E1003
  arm64: mm: Move ASID from TTBR0 to TTBR1
  arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN
  arm64: mm: Use non-global mappings for kernel space
  arm64: move TASK_* definitions to <asm/processor.h>
  media: hdpvr: Fix an error handling path in hdpvr_probe()
  media: dvb-usb-v2: lmedm04: move ts2020 attach to dm04_lme2510_tuner
  media: dvb-usb-v2: lmedm04: Improve logic checking of warm start
  dccp: CVE-2017-8824: use-after-free in DCCP code
  drm/i915: Fix deadlock in i830_disable_pipe()
  drm/i915: Redo plane sanitation during readout
  drm/i915: Add .get_hw_state() method for planes
  sched/rt: Up the root domain ref count when passing it around via IPIs
  sched/rt: Use container_of() to get root domain in rto_push_irq_work_func()
  KVM MMU: check pending exception before injecting APF
  arm64: Add software workaround for Falkor erratum 1041
  arm64: Define cputype macros for Falkor CPU
  watchdog: gpio_wdt: set WDOG_HW_RUNNING in gpio_wdt_stop
  sched/wait: Fix add_wait_queue() behavioral change
  dmaengine: dmatest: fix container_of member in dmatest_callback
  cpufreq: mediatek: add mediatek related projects into blacklist
  CIFS: zero sensitive data when freeing
  cifs: Fix autonegotiate security settings mismatch
  cifs: Fix missing put_xid in cifs_file_strict_mmap
  powerpc/pseries: include linux/types.h in asm/hvcall.h
  watchdog: indydog: Add dependency on SGI_HAS_INDYDOG
  ANDROID: Fixup 64/32-bit divide confusion for WALT configs

Conflicts:
	include/trace/events/sched.h
	kernel/sched/sched.h
	lib/ubsan.c
	lib/ubsan.h
	arch/arm64/configs/sdm855_defconfig
	arch/arm64/configs/sdm855-perf_defconfig

Change-Id: I034588046a45f3d8be0615bed40d2ddd334ebd74
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
 2018-02-21 16:33:21 -08:00
Andrey Ryabinin
2617e62c2f lib/ubsan: add type mismatch handler for new GCC/Clang 
commit 42440c1f9911b4b7b8ba3dc4e90c1197bc561211 upstream.

UBSAN=y fails to build with new GCC/clang:

    arch/x86/kernel/head64.o: In function `sanitize_boot_params':
    arch/x86/include/asm/bootparam_utils.h:37: undefined reference to `__ubsan_handle_type_mismatch_v1'

because Clang and GCC 8 slightly changed ABI for 'type mismatch' errors.
Compiler now uses new __ubsan_handle_type_mismatch_v1() function with
slightly modified 'struct type_mismatch_data'.

Let's add new 'struct type_mismatch_data_common' which is independent from
compiler's layout of 'struct type_mismatch_data'.  And make
__ubsan_handle_type_mismatch[_v1]() functions transform compiler-dependent
type mismatch data to our internal representation.  This way, we can
support both old and new compilers with minimal amount of change.

Link: http://lkml.kernel.org/r/20180119152853.16806-1-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: Sodagudi Prasad <psodagud@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-02-16 20:23:09 +01:00
Andrey Ryabinin
6ccc50118f lib/ubsan: remove returns-nonnull-attribute checks 
Similarly to type mismatch checks, new GCC 8.x and Clang also changed for
ABI for returns_nonnull checks.  While we can update our code to conform
the new ABI it's more reasonable to just remove it.  Because it's just
dead code, we don't have any single user of returns_nonnull attribute in
the whole kernel.

And AFAIU the advantage that this attribute could bring would be mitigated
by -fno-delete-null-pointer-checks cflag that we use to build the kernel.
So it's unlikely we will have a lot of returns_nonnull attribute in
future.

So let's just remove the code, it has no use.

Change-Id: I479d6f1355781017abdee33f5adf8fd3fdbe4304
[aryabinin@virtuozzo.com: fix warning]
  Link: http://lkml.kernel.org/r/20180122165711.11510-1-aryabinin@virtuozzo.com
Link: http://lkml.kernel.org/r/20180119152853.16806-2-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Sodagudi Prasad <psodagud@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: bac7a1fff7926fb9891a18fe33650884b0e13e41
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
 2018-02-07 06:44:09 -08:00
Andrey Ryabinin
0eaa11b6be lib/ubsan: add type mismatch handler for new GCC/Clang 
UBSAN=y fails to build with new GCC/clang:

    arch/x86/kernel/head64.o: In function `sanitize_boot_params':
    arch/x86/include/asm/bootparam_utils.h:37: undefined reference to `__ubsan_handle_type_mismatch_v1'

because Clang and GCC 8 slightly changed ABI for 'type mismatch' errors.
Compiler now uses new __ubsan_handle_type_mismatch_v1() function with
slightly modified 'struct type_mismatch_data'.

Let's add new 'struct type_mismatch_data_common' which is independent from
compiler's layout of 'struct type_mismatch_data'.  And make
__ubsan_handle_type_mismatch[_v1]() functions transform compiler-dependent
type mismatch data to our internal representation.  This way, we can
support both old and new compilers with minimal amount of change.

Change-Id: I94df3107b7b4434305f1188aeadfa40fd0e3d072
Link: http://lkml.kernel.org/r/20180119152853.16806-1-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: Sodagudi Prasad <psodagud@codeaurora.org>
Cc: <stable@vger.kernel.org>	[4.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 42440c1f9911b4b7b8ba3dc4e90c1197bc561211
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
 2018-02-07 06:42:00 -08:00
Greg Kroah-Hartman
b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-11-02 11:10:55 +01:00
Andrey Ryabinin
c6d308534a UBSAN: run-time undefined behavior sanity checker 
UBSAN uses compile-time instrumentation to catch undefined behavior
(UB).  Compiler inserts code that perform certain kinds of checks before
operations that could cause UB.  If check fails (i.e.  UB detected)
__ubsan_handle_* function called to print error message.

So the most of the work is done by compiler.  This patch just implements
ubsan handlers printing errors.

GCC has this capability since 4.9.x [1] (see -fsanitize=undefined
option and its suboptions).
However GCC 5.x has more checkers implemented [2].
Article [3] has a bit more details about UBSAN in the GCC.

[1] - https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Debugging-Options.html
[2] - https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
[3] - http://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/

Issues which UBSAN has found thus far are:

Found bugs:

 * out-of-bounds access - 97840cb67ff5 ("netfilter: nfnetlink: fix
   insufficient validation in nfnetlink_bind")

undefined shifts:

 * d48458d4a768 ("jbd2: use a better hash function for the revoke
   table")

 * 10632008b9e1 ("clockevents: Prevent shift out of bounds")

 * 'x << -1' shift in ext4 -
   http://lkml.kernel.org/r/<5444EF21.8020501@samsung.com>

 * undefined rol32(0) -
   http://lkml.kernel.org/r/<1449198241-20654-1-git-send-email-sasha.levin@oracle.com>

 * undefined dirty_ratelimit calculation -
   http://lkml.kernel.org/r/<566594E2.3050306@odin.com>

 * undefined roundown_pow_of_two(0) -
   http://lkml.kernel.org/r/<1449156616-11474-1-git-send-email-sasha.levin@oracle.com>

 * [WONTFIX] undefined shift in __bpf_prog_run -
   http://lkml.kernel.org/r/<CACT4Y+ZxoR3UjLgcNdUm4fECLMx2VdtfrENMtRRCdgHB2n0bJA@mail.gmail.com>

   WONTFIX here because it should be fixed in bpf program, not in kernel.

signed overflows:

 * 32a8df4e0b33f ("sched: Fix odd values in effective_load()
   calculations")

 * mul overflow in ntp -
   http://lkml.kernel.org/r/<1449175608-1146-1-git-send-email-sasha.levin@oracle.com>

 * incorrect conversion into rtc_time in rtc_time64_to_tm() -
   http://lkml.kernel.org/r/<1449187944-11730-1-git-send-email-sasha.levin@oracle.com>

 * unvalidated timespec in io_getevents() -
   http://lkml.kernel.org/r/<CACT4Y+bBxVYLQ6LtOKrKtnLthqLHcw-BMp3aqP3mjdAvr9FULQ@mail.gmail.com>

 * [NOTABUG] signed overflow in ktime_add_safe() -
   http://lkml.kernel.org/r/<CACT4Y+aJ4muRnWxsUe1CMnA6P8nooO33kwG-c8YZg=0Xc8rJqw@mail.gmail.com>

[akpm@linux-foundation.org: fix unused local warning]
[akpm@linux-foundation.org: fix __int128 build woes]
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yury Gribov <y.gribov@samsung.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Kostya Serebryany <kcc@google.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2016-01-20 17:09:18 -08:00