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LLVM's integrated assembler appears to assume an argument with default
value is passed whenever it sees a comma right after the macro name.
It will be fine if the number of following arguments is one less than
the number of parameters specified in the macro definition. Otherwise,
it fails. For example, the following code works:
$ cat foo.s
.macro foo arg1=2, arg2=4
ldr r0, [r1, #\arg1]
ldr r0, [r1, #\arg2]
.endm
foo, arg2=8
$ llvm-mc -triple=armv7a -filetype=obj foo.s -o ias.o
arm-linux-gnueabihf-objdump -dr ias.o
ias.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <.text>:
0: e5910001 ldr r0, [r1, #2]
4: e5910003 ldr r0, [r1, #8]
While the the following code would fail:
$ cat foo.s
.macro foo arg1=2, arg2=4
ldr r0, [r1, #\arg1]
ldr r0, [r1, #\arg2]
.endm
foo, arg1=2, arg2=8
$ llvm-mc -triple=armv7a -filetype=obj foo.s -o ias.o
foo.s:6:14: error: too many positional arguments
foo, arg1=2, arg2=8
This causes build failures as follows:
arch/arm64/kernel/vdso/gettimeofday.S:230:24: error: too many positional
arguments
clock_gettime_return, shift=1
^
arch/arm64/kernel/vdso/gettimeofday.S:253:24: error: too many positional
arguments
clock_gettime_return, shift=1
^
arch/arm64/kernel/vdso/gettimeofday.S:274:24: error: too many positional
arguments
clock_gettime_return, shift=1
This error is not in mainline because commit 28b1a824a4f4 ("arm64: vdso:
Substitute gettimeofday() with C implementation") rewrote this assembler
file in C as part of a 25 patch series that is unsuitable for stable.
Just remove the comma in the clock_gettime_return invocations in 4.19 so
that GNU as and LLVM's integrated assembler work the same.
Link:
https://github.com/ClangBuiltLinux/linux/issues/1349
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jian Cai <jiancai@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I7eea04241c1f8ac7bc3b7915b781acdd1e2b6686
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https://android.googlesource.com/kernel/common into lineage-18.1-caf-msm8998
This brings LA.UM.9.2.r1-03300-SDMxx0.0 up to date with
https://android.googlesource.com/kernel/common/ android-4.4-p at commit:
3628cdd31199d Merge 4.4.270 into android-4.4-p
Conflicts:
drivers/mmc/core/core.c
drivers/usb/core/hub.c
kernel/trace/trace.c
Change-Id: I6b81471122341f9769ce9c65cbd0fedd5e908b38
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Changes in 4.4.269
timerfd: Reject ALARM timerfds without CAP_WAKE_ALARM
net: usb: ax88179_178a: initialize local variables before use
iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_enqueue_hcmd()
ALSA: usb-audio: Add MIDI quirk for Vox ToneLab EX
USB: Add LPM quirk for Lenovo ThinkPad USB-C Dock Gen2 Ethernet
USB: Add reset-resume quirk for WD19's Realtek Hub
platform/x86: thinkpad_acpi: Correct thermal sensor allocation
s390/disassembler: increase ebpf disasm buffer size
ACPI: custom_method: fix potential use-after-free issue
ACPI: custom_method: fix a possible memory leak
ecryptfs: fix kernel panic with null dev_name
mmc: core: Do a power cycle when the CMD11 fails
mmc: core: Set read only for SD cards with permanent write protect bit
fbdev: zero-fill colormap in fbcmap.c
staging: wimax/i2400m: fix byte-order issue
usb: gadget: uvc: add bInterval checking for HS mode
PCI: PM: Do not read power state in pci_enable_device_flags()
x86/build: Propagate $(CLANG_FLAGS) to $(REALMODE_FLAGS)
spi: dln2: Fix reference leak to master
spi: omap-100k: Fix reference leak to master
intel_th: Consistency and off-by-one fix
phy: phy-twl4030-usb: Fix possible use-after-free in twl4030_usb_remove()
btrfs: convert logic BUG_ON()'s in replace_path to ASSERT()'s
scsi: target: pscsi: Fix warning in pscsi_complete_cmd()
media: ite-cir: check for receive overflow
media: media/saa7164: fix saa7164_encoder_register() memory leak bugs
media: gspca/sq905.c: fix uninitialized variable
media: em28xx: fix memory leak
clk: socfpga: arria10: Fix memory leak of socfpga_clk on error return
power: supply: generic-adc-battery: fix possible use-after-free in gab_remove()
power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove()
media: i2c: adv7511-v4l2: fix possible use-after-free in adv7511_remove()
media: dvb-usb: fix memory leak in dvb_usb_adapter_init
media: gscpa/stv06xx: fix memory leak
drm/msm/mdp5: Configure PP_SYNC_HEIGHT to double the vtotal
drm/amdgpu: fix NULL pointer dereference
scsi: lpfc: Fix crash when a REG_RPI mailbox fails triggering a LOGO response
scsi: libfc: Fix a format specifier
ALSA: emu8000: Fix a use after free in snd_emu8000_create_mixer
ALSA: sb: Fix two use after free in snd_sb_qsound_build
arm64/vdso: Discard .note.gnu.property sections in vDSO
openvswitch: fix stack OOB read while fragmenting IPv4 packets
jffs2: Fix kasan slab-out-of-bounds problem
powerpc/eeh: Fix EEH handling for hugepages in ioremap space.
powerpc: fix EDEADLOCK redefinition error in uapi/asm/errno.h
jffs2: check the validity of dstlen in jffs2_zlib_compress()
ftrace: Handle commands when closing set_ftrace_filter file
ext4: fix check to prevent false positive report of incorrect used inodes
ext4: fix error code in ext4_commit_super
usb: gadget: dummy_hcd: fix gpf in gadget_setup
usb: gadget/function/f_fs string table fix for multiple languages
dm persistent data: packed struct should have an aligned() attribute too
dm space map common: fix division bug in sm_ll_find_free_block()
Bluetooth: verify AMP hci_chan before amp_destroy
hsr: use netdev_err() instead of WARN_ONCE()
net/nfc: fix use-after-free llcp_sock_bind/connect
FDDI: defxx: Bail out gracefully with unassigned PCI resource for CSR
misc: lis3lv02d: Fix false-positive WARN on various HP models
misc: vmw_vmci: explicitly initialize vmci_notify_bm_set_msg struct
misc: vmw_vmci: explicitly initialize vmci_datagram payload
tracing: Use strlcpy() instead of strcpy() in __trace_find_cmdline()
tracing: Treat recording comm for idle task as a success
tracing: Map all PIDs to command lines
tracing: Restructure trace_clock_global() to never block
md: factor out a mddev_find_locked helper from mddev_find
md: md_open returns -EBUSY when entering racing area
ipw2x00: potential buffer overflow in libipw_wx_set_encodeext()
cfg80211: scan: drop entry from hidden_list on overflow
drm/radeon: fix copy of uninitialized variable back to userspace
ALSA: hda/realtek: Re-order ALC882 Acer quirk table entries
ALSA: hda/realtek: Re-order ALC882 Sony quirk table entries
ALSA: hda/realtek: Re-order ALC269 Sony quirk table entries
ALSA: hda/realtek: Remove redundant entry for ALC861 Haier/Uniwill devices
KVM: s390: split kvm_s390_real_to_abs
usb: gadget: pch_udc: Revert d3cb25a12138 completely
memory: gpmc: fix out of bounds read and dereference on gpmc_cs[]
ARM: dts: exynos: correct PMIC interrupt trigger level on SMDK5250
ARM: dts: exynos: correct PMIC interrupt trigger level on Snow
usb: gadget: pch_udc: Replace cpu_to_le32() by lower_32_bits()
usb: gadget: pch_udc: Check if driver is present before calling ->setup()
usb: gadget: pch_udc: Check for DMA mapping error
crypto: qat - don't release uninitialized resources
fotg210-udc: Fix DMA on EP0 for length > max packet size
fotg210-udc: Fix EP0 IN requests bigger than two packets
fotg210-udc: Remove a dubious condition leading to fotg210_done
fotg210-udc: Mask GRP2 interrupts we don't handle
fotg210-udc: Don't DMA more than the buffer can take
fotg210-udc: Complete OUT requests on short packets
mtd: require write permissions for locking and badblock ioctls
crypto: qat - fix error path in adf_isr_resource_alloc()
staging: rtl8192u: Fix potential infinite loop
crypto: qat - Fix a double free in adf_create_ring
usb: gadget: r8a66597: Add missing null check on return from platform_get_resource
USB: cdc-acm: fix unprivileged TIOCCSERIAL
tty: fix return value for unsupported ioctls
ttyprintk: Add TTY hangup callback.
media: vivid: fix assignment of dev->fbuf_out_flags
media: omap4iss: return error code when omap4iss_get() failed
media: m88rs6000t: avoid potential out-of-bounds reads on arrays
pata_arasan_cf: fix IRQ check
pata_ipx4xx_cf: fix IRQ check
sata_mv: add IRQ checks
ata: libahci_platform: fix IRQ check
scsi: fcoe: Fix mismatched fcoe_wwn_from_mac declaration
media: dvb-usb-remote: fix dvb_usb_nec_rc_key_to_event type mismatch
scsi: jazz_esp: Add IRQ check
scsi: sun3x_esp: Add IRQ check
scsi: sni_53c710: Add IRQ check
HSI: core: fix resource leaks in hsi_add_client_from_dt()
x86/events/amd/iommu: Fix sysfs type mismatch
HID: plantronics: Workaround for double volume key presses
net: lapbether: Prevent racing when checking whether the netif is running
powerpc/prom: Mark identical_pvr_fixup as __init
ALSA: core: remove redundant spin_lock pair in snd_card_disconnect
nfc: pn533: prevent potential memory corruption
ALSA: usb-audio: Add error checks for usb_driver_claim_interface() calls
powerpc: iommu: fix build when neither PCI or IBMVIO is set
mac80211: bail out if cipher schemes are invalid
mt7601u: fix always true expression
net: thunderx: Fix unintentional sign extension issue
i2c: cadence: add IRQ check
i2c: jz4780: add IRQ check
i2c: sh7760: add IRQ check
powerpc/pseries: extract host bridge from pci_bus prior to bus removal
i2c: sh7760: fix IRQ error path
mwl8k: Fix a double Free in mwl8k_probe_hw
vsock/vmci: log once the failed queue pair allocation
net: davinci_emac: Fix incorrect masking of tx and rx error channel
ath9k: Fix error check in ath9k_hw_read_revisions() for PCI devices
powerpc/52xx: Fix an invalid ASM expression ('addi' used instead of 'add')
net:nfc:digital: Fix a double free in digital_tg_recv_dep_req
kfifo: fix ternary sign extension bugs
Revert "net/sctp: fix race condition in sctp_destroy_sock"
sctp: delay auto_asconf init until binding the first addr
fs: dlm: fix debugfs dump
tipc: convert dest node's address to network order
net: stmmac: Set FIFO sizes for ipq806x
ALSA: hdsp: don't disable if not enabled
ALSA: hdspm: don't disable if not enabled
ALSA: rme9652: don't disable if not enabled
Bluetooth: Set CONF_NOT_COMPLETE as l2cap_chan default
Bluetooth: initialize skb_queue_head at l2cap_chan_create()
ip6_vti: proper dev_{hold|put} in ndo_[un]init methods
mac80211: clear the beacon's CRC after channel switch
cuse: prevent clone
selftests: Set CC to clang in lib.mk if LLVM is set
kconfig: nconf: stop endless search loops
sctp: Fix out-of-bounds warning in sctp_process_asconf_param()
ASoC: rt286: Generalize support for ALC3263 codec
wl3501_cs: Fix out-of-bounds warnings in wl3501_send_pkt
wl3501_cs: Fix out-of-bounds warnings in wl3501_mgmt_join
powerpc/iommu: Annotate nested lock for lockdep
ASoC: rt286: Make RT286_SET_GPIO_* readable and writable
PCI: Release OF node in pci_scan_device()'s error path
NFS: Deal correctly with attribute generation counter overflow
pNFS/flexfiles: fix incorrect size check in decode_nfs_fh()
NFSv4.2 fix handling of sr_eof in SEEK's reply
sctp: fix a SCTP_MIB_CURRESTAB leak in sctp_sf_do_dupcook_b
drm/radeon: Fix off-by-one power_state index heap overwrite
ksm: fix potential missing rmap_item for stable_node
kernel: kexec_file: fix error return code of kexec_calculate_store_digests()
ARC: entry: fix off-by-one error in syscall number validation
powerpc/64s: Fix crashes when toggling entry flush barrier
squashfs: fix divide error in calculate_skip()
usb: fotg210-hcd: Fix an error message
usb: xhci: Increase timeout for HC halt
usb: dwc2: Fix gadget DMA unmap direction
usb: core: hub: fix race condition about TRSMRCY of resume
KVM: x86: Cancel pvclock_gtod_work on module removal
FDDI: defxx: Make MMIO the configuration default except for EISA
thermal/core/fair share: Lock the thermal zone while looping over instances
dm ioctl: fix out of bounds array access when no devices
kobject_uevent: remove warning in init_uevent_argv()
x86/msr: Fix wr/rdmsr_safe_regs_on_cpu() prototypes
kgdb: fix gcc-11 warning on indentation
usb: sl811-hcd: improve misleading indentation
cxgb4: Fix the -Wmisleading-indentation warning
isdn: capi: fix mismatched prototypes
ACPI / hotplug / PCI: Fix reference count leak in enable_slot()
um: Mark all kernel symbols as local
ALSA: hda: generic: change the DAC ctl name for LO+SPK or LO+HP
sit: proper dev_{hold|put} in ndo_[un]init methods
ip6_tunnel: sit: proper dev_{hold|put} in ndo_[un]init methods
ipv6: remove extra dev_hold() for fallback tunnels
xhci: Do not use GFP_KERNEL in (potentially) atomic context
iio: tsl2583: Fix division by a zero lux_val
Linux 4.4.269
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ifc6e8ab285aa71c13faa3c5002c25c5e33110b47
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[ Upstream commit 388708028e6937f3fc5fc19aeeb847f8970f489c ]
The arm64 assembler in binutils 2.32 and above generates a program
property note in a note section, .note.gnu.property, to encode used x86
ISAs and features. But the kernel linker script only contains a single
NOTE segment:
PHDRS
{
text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
note PT_NOTE FLAGS(4); /* PF_R */
}
The NOTE segment generated by the vDSO linker script is aligned to 4 bytes.
But the .note.gnu.property section must be aligned to 8 bytes on arm64.
$ readelf -n vdso64.so
Displaying notes found in: .note
Owner Data size Description
Linux 0x00000004 Unknown note type: (0x00000000)
description data: 06 00 00 00
readelf: Warning: note with invalid namesz and/or descsz found at offset 0x20
readelf: Warning: type: 0x78, namesize: 0x00000100, descsize: 0x756e694c, alignment: 8
Since the note.gnu.property section in the vDSO is not checked by the
dynamic linker, discard the .note.gnu.property sections in the vDSO.
Similar to commit 4caffe6a28d31 ("x86/vdso: Discard .note.gnu.property
sections in vDSO"), but for arm64.
Signed-off-by: Bill Wendling <morbo@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20210423205159.830854-1-morbo@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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commit dbb236c1ceb697a559e0694ac4c9e7b9131d0b16 upstream.
Recently vDSO support for CLOCK_MONOTONIC_RAW was added in
49eea433b326 ("arm64: Add support for CLOCK_MONOTONIC_RAW in
clock_gettime() vDSO"). Noticing that the core timekeeping code
never set tkr_raw.xtime_nsec, the vDSO implementation didn't
bother exposing it via the data page and instead took the
unshifted tk->raw_time.tv_nsec value which was then immediately
shifted left in the vDSO code.
Unfortunately, by accellerating the MONOTONIC_RAW clockid, it
uncovered potential 1ns time inconsistencies caused by the
timekeeping core not handing sub-ns resolution.
Now that the core code has been fixed and is actually setting
tkr_raw.xtime_nsec, we need to take that into account in the
vDSO by adding it to the shifted raw_time value, in order to
fix the user-visible inconsistency. Rather than do that at each
use (and expand the data page in the process), instead perform
the shift/addition operation when populating the data page and
remove the shift from the vDSO code entirely.
[jstultz: minor whitespace tweak, tried to improve commit
message to make it more clear this fixes a regression]
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Daniel Mentz <danielmentz@google.com>
Acked-by: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Link: http://lkml.kernel.org/r/1496965462-20003-4-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I51b5ebd994635eb091ad6a084ddfa12074f27d81
Tested-by: Freddy Hsin <freddy.hsin@mediatek.com>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
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The vDSO needs to be build with x18 reserved in order to accommodate
userspace platform ABIs built on top of Linux that use the register
to carry inter-procedural state, as provided for by the AAPCS.
An example of such a platform ABI is the one that will be used by an
upcoming version of Android.
Although this change is currently a no-op due to the fact that the vDSO
is currently implemented in pure assembly on arm64, it is necessary
in order to prepare for another change [1] that will add C code to
the vDSO.
[1] https://patchwork.kernel.org/patch/10044501/
Change-Id: Icaac4b1c9127d81d754d3b8688274e9afc781760
Signed-off-by: Peter Collingbourne <pcc@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Mark Salyzyn <salyzyn@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
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(cherry pick from url https://patchwork.kernel.org/patch/10053549/)
Add time() vdso support to match up with existing support in the x86's
vdso. Currently benefitting arm and arm64 which uses the common
vgettimeofday.c implementation. On arm provides about a ~14 fold
improvement in speed over the straight syscall, and about a ~5 fold
improvement in speed over an alternate library implementation that
relies on the vdso call to gettimeofday to fulfill the request.
We can provide __vdso_time even if we can not provide a speed
enhanced __vdso_gettimeofday.
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Bug: 63737556
Bug: 20045882
Change-Id: I0bb3c6bafe57f9ed69350e2dd54edaae58316e8f
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vgettimeofday.C
(cherry picked from url https://patchwork.kernel.org/patch/10044501/)
Take an effort from the previous 9 patches to recode the arm64 vdso
code from assembler to C previously submitted by
Andrew Pinski <apinski@cavium.com>, rework it for use in both arm and
arm64, overlapping any optimizations for each architecture. But
instead of landing it in arm64, land the result into lib/vdso and
unify both implementations to simplify future maintenance.
apinski@cavium.com makes the following claims in the original patch:
This allows the compiler to optimize the divide by 1000 and remove
the other divides.
On ThunderX, gettimeofday improves by 32%. On ThunderX 2,
gettimeofday improves by 18%.
Note I noticed a bug in the old (arm64) implementation of
__kernel_clock_getres; it was checking only the lower 32bits of the
pointer; this would work for most cases but could fail in a few.
<end of claim>
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: James Morse <james.morse@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Andrew Pinski <apinski@cavium.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Bug: 63737556
Bug: 20045882
Change-Id: I71ff27ff5bfa323354fda6867b01ec908d8d6cbd
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Recently vDSO support for CLOCK_MONOTONIC_RAW was added in
49eea433b326 ("arm64: Add support for CLOCK_MONOTONIC_RAW in
clock_gettime() vDSO"). Noticing that the core timekeeping code
never set tkr_raw.xtime_nsec, the vDSO implementation didn't
bother exposing it via the data page and instead took the
unshifted tk->raw_time.tv_nsec value which was then immediately
shifted left in the vDSO code.
Unfortunately, by accellerating the MONOTONIC_RAW clockid, it
uncovered potential 1ns time inconsistencies caused by the
timekeeping core not handing sub-ns resolution.
Now that the core code has been fixed and is actually setting
tkr_raw.xtime_nsec, we need to take that into account in the
vDSO by adding it to the shifted raw_time value, in order to
fix the user-visible inconsistency. Rather than do that at each
use (and expand the data page in the process), instead perform
the shift/addition operation when populating the data page and
remove the shift from the vDSO code entirely.
[jstultz: minor whitespace tweak, tried to improve commit
message to make it more clear this fixes a regression]
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Daniel Mentz <danielmentz@google.com>
Acked-by: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Cc: "stable #4 . 8+" <stable@vger.kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Link: http://lkml.kernel.org/r/1496965462-20003-4-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Git-commit: dbb236c1ceb697a559e0694ac4c9e7b9131d0b16
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: Ifa530498a6cd364ef258691ddf03cd3bc2a860b5
[vivekuma@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Vivek Kumar <vivekuma@codeaurora.org>
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(cherry pick from commit c80ed088a519da53f27b798a69748eaabc66aadf)
The vdso tries to check for a NULL res pointer in __kernel_clock_getres,
but only checks the lower 32 bits as is uses CBZ on the W register the
res pointer is held in.
Thus, if the res pointer happened to be aligned to a 4GiB boundary, we'd
spuriously skip storing the timespec to it, while returning a zero error code
to the caller.
Prevent this by checking the whole pointer, using CBZ on the X register
the res pointer is held in.
Fixes: 9031fefde6f2ac1d ("arm64: VDSO support")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Andrew Pinski <apinski@cavium.com>
Reported-by: Mark Salyzyn <salyzyn@android.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 20045882
Bug: 63737556
Change-Id: Iab5449d8515f9d655e792e3d7ce43a8f016fa2a0
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(cherry pick from commit 49eea433b326a0ac5c7c941a011b2c65990bd19b)
So far the arm64 clock_gettime() vDSO implementation only supported
the following clocks, falling back to the syscall for the others:
- CLOCK_REALTIME{,_COARSE}
- CLOCK_MONOTONIC{,_COARSE}
This patch adds support for the CLOCK_MONOTONIC_RAW clock, taking
advantage of the recent refactoring of the vDSO time functions. Like
the non-_COARSE clocks, this only works when the "arch_sys_counter"
clocksource is in use (allowing us to read the current time from the
virtual counter register), otherwise we also have to fall back to the
syscall.
Most of the data is shared with CLOCK_MONOTONIC, and the algorithm is
similar. The reference implementation in kernel/time/timekeeping.c
shows that:
- CLOCK_MONOTONIC = tk->wall_to_monotonic + tk->xtime_sec +
timekeeping_get_ns(&tk->tkr_mono)
- CLOCK_MONOTONIC_RAW = tk->raw_time + timekeeping_get_ns(&tk->tkr_raw)
- tkr_mono and tkr_raw are identical (in particular, same
clocksource), except these members:
* mult (only mono's multiplier is NTP-adjusted)
* xtime_nsec (always 0 for raw)
Therefore, tk->raw_time and tkr_raw->mult are now also stored in the
vDSO data page.
Cc: Ali Saidi <ali.saidi@arm.com>
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: I854adcc1192757a1ac40662e85d466ca709d0682
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(cherry pick from commit b33f491f5a9aaf171b7de0f905362eb0314af478)
Time functions are directly implemented in assembly in arm64, and it
is desirable to keep it this way for performance reasons (everything
fits in registers, so that the stack is not used at all). However, the
current implementation is quite difficult to read and understand (even
considering it's assembly). Additionally, due to the structure of
__kernel_clock_gettime, which heavily uses conditional branches to
share code between the different clocks, it is difficult to support a
new clock without making the branches even harder to follow.
This commit completely refactors the structure of clock_gettime (and
gettimeofday along the way) while keeping exactly the same algorithms.
We no longer try to share code; instead, macros provide common
operations. This new approach comes with a number of advantages:
- In clock_gettime, clock implementations are no longer interspersed,
making them much more readable. Additionally, macros only use
registers passed as arguments or reserved with .req, this way it is
easy to make sure that registers are properly allocated. To avoid a
large number of branches in a given execution path, a jump table is
used; a normal execution uses 3 unconditional branches.
- __do_get_tspec has been replaced with 2 macros (get_ts_clock_mono,
get_clock_shifted_nsec) and explicit loading of data from the vDSO
page. Consequently, clock_gettime and gettimeofday are now leaf
functions, and saving x30 (lr) is no longer necessary.
- Variables protected by tb_seq_count are now loaded all at once,
allowing to merge the seqcnt_read macro into seqcnt_check.
- For CLOCK_REALTIME_COARSE, removed an unused load of the wall to
monotonic timespec.
- For CLOCK_MONOTONIC_COARSE, removed a few shift instructions.
Obviously, the downside of sharing less code is an increase in code
size. However since the vDSO has its own code page, this does not
really matter, as long as the size of the DSO remains below 4 kB. For
now this should be all right:
Before After
vdso.so size (B) 2776 3000
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: I0a0036c54419ee561efe3aad97489e7748ddc59e
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(cherry pick from commit a66649dab35033bd67988670fa60c268b0444cda)
arm64/kernel/{vdso,signal}.c include vdso-offsets.h, as well as any
file that includes asm/vdso.h. Therefore, vdso-offsets.h must be
generated before these files are compiled.
The current rules in arm64/kernel/Makefile do not actually enforce
this, because even though $(obj)/vdso is listed as a prerequisite for
vdso-offsets.h, this does not result in the intended effect of
building the vdso subdirectory (before all the other objects). As a
consequence, depending on the order in which the rules are followed,
vdso-offsets.h is updated or not before arm64/kernel/{vdso,signal}.o
are built. The current rules also impose an unnecessary dependency on
vdso-offsets.h for all arm64/kernel/*.o, resulting in unnecessary
rebuilds. This is made obvious when using make -j:
touch arch/arm64/kernel/vdso/gettimeofday.S && make -j$NCPUS arch/arm64/kernel
will sometimes result in none of arm64/kernel/*.o being
rebuilt, sometimes all of them, or even just some of them.
It is quite difficult to ensure that a header is generated before it
is used with recursive Makefiles by using normal rules. Instead,
arch-specific generated headers are normally built in the archprepare
recipe in the arch Makefile (see for instance arch/ia64/Makefile).
Unfortunately, asm-offsets.h is included in gettimeofday.S, and must
therefore be generated before vdso-offsets.h, which is not the case if
archprepare is used. For this reason, a rule run after archprepare has
to be used.
This commit adds rules in arm64/Makefile to build vdso-offsets.h
during the prepare step, ensuring that vdso-offsets.h is generated
before building anything. It also removes the now-unnecessary
dependencies on vdso-offsets.h in arm64/kernel/Makefile. Finally, it
removes the duplication of asm-offsets.h between arm64/kernel/vdso/
and include/generated/ and makes include/generated/vdso-offsets.h a
target in arm64/kernel/vdso/Makefile.
Cc: Will Deacon <will.deacon@arm.com>
Cc: Michal Marek <mmarek@suse.com>
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: Iaaf1c6d3c98287617fc7f63a736752f6597bc8d0
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Although the arm64 vDSO is cleanly separated by code/data with the
code being read-only in userspace mappings, the code page is still
writable from the kernel. There have been exploits (such as
http://itszn.com/blog/?p=21) that take advantage of this on x86 to go
from a bad kernel write to full root.
Prevent this specific exploit on arm64 by putting the vDSO code page
in read-only memory as well.
Before the change:
[ 3.138366] vdso: 2 pages (1 code @ ffffffc000a71000, 1 data @ ffffffc000a70000)
---[ Kernel Mapping ]---
0xffffffc000000000-0xffffffc000082000 520K RW NX SHD AF UXN MEM/NORMAL
0xffffffc000082000-0xffffffc000200000 1528K ro x SHD AF UXN MEM/NORMAL
0xffffffc000200000-0xffffffc000800000 6M ro x SHD AF BLK UXN MEM/NORMAL
0xffffffc000800000-0xffffffc0009b6000 1752K ro x SHD AF UXN MEM/NORMAL
0xffffffc0009b6000-0xffffffc000c00000 2344K RW NX SHD AF UXN MEM/NORMAL
0xffffffc000c00000-0xffffffc008000000 116M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc00c000000-0xffffffc07f000000 1840M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc800000000-0xffffffc840000000 1G RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc840000000-0xffffffc87ae00000 942M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc87ae00000-0xffffffc87ae70000 448K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87af80000-0xffffffc87af8a000 40K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87af8b000-0xffffffc87b000000 468K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87b000000-0xffffffc87fe00000 78M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc87fe00000-0xffffffc87ff50000 1344K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87ff90000-0xffffffc87ffa0000 64K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87fff0000-0xffffffc880000000 64K RW NX SHD AF UXN MEM/NORMAL
After:
[ 3.138368] vdso: 2 pages (1 code @ ffffffc0006de000, 1 data @ ffffffc000a74000)
---[ Kernel Mapping ]---
0xffffffc000000000-0xffffffc000082000 520K RW NX SHD AF UXN MEM/NORMAL
0xffffffc000082000-0xffffffc000200000 1528K ro x SHD AF UXN MEM/NORMAL
0xffffffc000200000-0xffffffc000800000 6M ro x SHD AF BLK UXN MEM/NORMAL
0xffffffc000800000-0xffffffc0009b8000 1760K ro x SHD AF UXN MEM/NORMAL
0xffffffc0009b8000-0xffffffc000c00000 2336K RW NX SHD AF UXN MEM/NORMAL
0xffffffc000c00000-0xffffffc008000000 116M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc00c000000-0xffffffc07f000000 1840M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc800000000-0xffffffc840000000 1G RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc840000000-0xffffffc87ae00000 942M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc87ae00000-0xffffffc87ae70000 448K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87af80000-0xffffffc87af8a000 40K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87af8b000-0xffffffc87b000000 468K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87b000000-0xffffffc87fe00000 78M RW NX SHD AF BLK UXN MEM/NORMAL
0xffffffc87fe00000-0xffffffc87ff50000 1344K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87ff90000-0xffffffc87ffa0000 64K RW NX SHD AF UXN MEM/NORMAL
0xffffffc87fff0000-0xffffffc880000000 64K RW NX SHD AF UXN MEM/NORMAL
Inspired by https://lkml.org/lkml/2016/1/19/494 based on work by the
PaX Team, Brad Spengler, and Kees Cook.
Signed-off-by: David Brown <david.brown@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[catalin.marinas@arm.com: removed superfluous __PAGE_ALIGNED_DATA]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 30369029
Patchset: kaslr-arm64-4.4
(cherry picked from commit 88d8a7994e564d209d4b2583496631c2357d386b)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I3fe4b48df8b27313ac61c947746805442757932c
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On a cross-toolchain without glibc support, libgcov may not be
available, and attempting to build an arm64 kernel with GCOV
enabled then results in a build error:
/home/arnd/cross-gcc/lib/gcc/aarch64-linux/5.2.1/../../../../aarch64-linux/bin/ld: cannot find -lgcov
We don't really want to link libgcov into the vdso anyway, so
this patch just disables GCOV in the vdso directory, just as
we do for most other architectures.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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When building the kernel with a bare-metal (ELF) toolchain, the -shared
option may not be passed down to collect2, resulting in silent corruption
of the vDSO image (in particular, the DYNAMIC section is omitted).
The effect of this corruption is that the dynamic linker fails to find
the vDSO symbols and libc is instead used for the syscalls that we
intended to optimise (e.g. gettimeofday). Functionally, there is no
issue as the sigreturn trampoline is still intact and located by the
kernel.
This patch fixes the problem by explicitly passing -shared to the linker
when building the vDSO.
Cc: <stable@vger.kernel.org>
Reported-by: Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Reported-by: James Greenlaigh <james.greenhalgh@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The vdso implementation of clock_getres currently returns 0 (success)
whenever a null timespec is provided by the caller, regardless of the
clock id supplied.
This behavior is incorrect. It should fall back to syscall when an
unrecognized clock id is passed, even when the timespec argument is
null. This ensures that clock_getres always returns an error for
invalid clock ids.
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Building a kernel with CPU_BIG_ENDIAN fails if there are stale objects
from a !CPU_BIG_ENDIAN build. Due to a missing FORCE prerequisite on an
if_changed rule in the VDSO Makefile, we attempt to link a stale LE
object into the new BE kernel.
According to Documentation/kbuild/makefiles.txt, FORCE is required for
if_changed rules and forgetting it is a common mistake, so fix it by
'Forcing' the build of vdso. This patch fixes build errors like these:
arch/arm64/kernel/vdso/note.o: compiled for a little endian system and target is big endian
failed to merge target specific data of file arch/arm64/kernel/vdso/note.o
arch/arm64/kernel/vdso/sigreturn.o: compiled for a little endian system and target is big endian
failed to merge target specific data of file arch/arm64/kernel/vdso/sigreturn.o
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Arun Chandran <achandran@mvista.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Michal Marek <mmarek@suse.cz>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kbuild@vger.kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Andy pointed out that binutils generates additional sections in the vdso
image (e.g. section string table) which, if our .text section gets big
enough, could cross a page boundary and end up screwing up the location
where the kernel expects to put the data page.
This patch solves the issue in the same manner as x86_32, by moving the
data page before the code pages.
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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When __kernel_clock_gettime is called with a CLOCK_MONOTONIC_COARSE or
CLOCK_REALTIME_COARSE clock id, it returns incorrectly to whatever the
caller has placed in x2 ("ret x2" to return from the fast path). Fix
this by saving x30/LR to x2 only in code that will call
__do_get_tspec, restoring x30 afterward, and using a plain "ret" to
return from the routine.
Also: while the resulting tv_nsec value for CLOCK_REALTIME and
CLOCK_MONOTONIC must be computed using intermediate values that are
left-shifted by cs_shift (x12, set by __do_get_tspec), the results for
coarse clocks should be calculated using unshifted values
(xtime_coarse_nsec is in units of actual nanoseconds). The current
code shifts intermediate values by x12 unconditionally, but x12 is
uninitialized when servicing a coarse clock. Fix this by setting x12
to 0 once we know we are dealing with a coarse clock id.
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Whilst the text segment for our VDSO is marked as PT_LOAD in the ELF
headers, it is mapped by the kernel and not actually subject to
demand-paging. ld doesn't realise this, and emits a p_align field of 64k
(the maximum supported page size), which conflicts with the load address
picked by the kernel on 4k systems, which will be 4k aligned. This
causes GDB to fail with "Failed to read a valid object file image from
memory" when attempting to load the VDSO.
This patch passes the -n option to ld, which prevents it from aligning
PT_LOAD segments to the maximum page size.
Cc: <stable@vger.kernel.org>
Reported-by: Kyle McMartin <kyle@redhat.com>
Acked-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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This patch is an arm64 version of ce73ec6db47a ("powerpc/vdso: Remove
redundant locking in update_vsyscall_tz()").
Timezone data is not protected, so the sequence counter is not required
to ensure consistency. Furthermore, having multiple paths updating the
counter leads to a race between update_vsyscall and update_vsyscall_tz,
so remove the timezone sequence counting from both the kernel and the
vdso.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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We want to use the virtual counter at EL0, as the physical counter
may not track the current clocksource for guests running under a
hypervisor.
This patch updates the vdso and generic timer driver to use the virtual
counter. The kernel EL2 entry code is also updated to ensure that the
virtual offset is initialised to zero.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Shifting the nanosecond component of the computed timespec early can
lead to sub-ns inaccuracies when using the truncated value as input to
further arithmetic for things like conversions to monotonic time.
This patch defers the timespec shifting until after the final value has
been computed.
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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In preparation for sub-ns precision in the vdso timespec maths, change
the __do_get_tspec register allocation so that we return the clocksource
shift value instead of the unused xtime tspec.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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When returning coarse realtime values from clock_gettime, we must still
check the sequence counter to ensure that the kernel does not update
the vdso datapage whilst we are loading the coarse timespec as this
could potentially result in time appearing to go backwards.
This patch delays the coarse realtime check until after we have loaded
successfully from the vdso datapage. This does mean that we always load
the wtm timespec, but conditionalising the load and adding an extra
sequence test is unlikely to buy us anything other than messy code,
particularly as the sequence test implies a read barrier.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The generic timer clocksource has 56 bits of precision and as such must
be masked appropriately after we have read it. The current mask
generated by a movn instruction is off by 4 bits, so we accidentally
include the top 4 bits in the final value.
This patch fixes the broken mask.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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This patch adds VDSO support for 64-bit applications. The VDSO code is
currently used for sys_rt_sigreturn() and optimised gettimeofday()
(using the user-accessible generic counter).
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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