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Andy Lutomirski b18cb64ead fs/proc: Stop trying to report thread stacks 
This reverts more of:

  b76437579d ("procfs: mark thread stack correctly in proc/<pid>/maps")

... which was partially reverted by:

  65376df582 ("proc: revert /proc/<pid>/maps [stack:TID] annotation")

Originally, /proc/PID/task/TID/maps was the same as /proc/TID/maps.

In current kernels, /proc/PID/maps (or /proc/TID/maps even for
threads) shows "[stack]" for VMAs in the mm's stack address range.

In contrast, /proc/PID/task/TID/maps uses KSTK_ESP to guess the
target thread's stack's VMA.  This is racy, probably returns garbage
and, on arches with CONFIG_TASK_INFO_IN_THREAD=y, is also crash-prone:
KSTK_ESP is not safe to use on tasks that aren't known to be running
ordinary process-context kernel code.

This patch removes the difference and just shows "[stack]" for VMAs
in the mm's stack range.  This is IMO much more sensible -- the
actual "stack" address really is treated specially by the VM code,
and the current thread stack isn't even well-defined for programs
that frequently switch stacks on their own.

Reported-by: Jann Horn <jann@thejh.net>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux API <linux-api@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tycho Andersen <tycho.andersen@canonical.com>
Link: http://lkml.kernel.org/r/3e678474ec14e0a0ec34c611016753eea2e1b8ba.1475257877.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-10-20 09:21:41 +02:00
..
80211 docs-rst: sphinxify 802.11 documentation 2016-10-11 16:19:17 -06:00
ABI The big ticket item here is support for rbd exclusive-lock feature, 2016-10-10 13:52:05 -07:00
accounting tools: move accounting tool from Documentation 2016-09-23 13:07:15 -06:00
acpi Merge branches 'acpi-button', 'acpi-battery' and 'acpi-doc' 2016-10-02 01:40:20 +02:00
aoe
arm linux-kselftest-4.9-rc1-update 2016-10-14 15:17:12 -07:00
arm64 arm64 updates for 4.9: 2016-10-03 08:58:35 -07:00
auxdisplay samples: move auxdisplay example code from Documentation 2016-09-23 11:52:32 -06:00
backlight
blackfin samples: move blackfin gptimers-example from Documentation 2016-10-10 07:12:02 -06:00
block
blockdev
bus-devices
cdrom
cgroup-v1
cma
connector
console
cpu-freq
cpuidle
cris
crypto
dev-tools mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping 2016-10-11 15:06:33 -07:00
development-process
device-mapper
devicetree Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-10-15 09:26:12 -07:00
dmaengine
DocBook A single commit converting the mac80211 DocBook template over to Sphinx. 2016-10-14 14:11:22 -07:00
driver-api
driver-model power supply and reset changes for the v4.9 series 2016-10-06 18:21:15 -07:00
early-userspace
EDID
extcon
fault-injection
fb
features Documentation: MIPS supports HAVE_REGS_AND_STACK_ACCESS_API 2016-10-13 17:19:19 +02:00
filesystems fs/proc: Stop trying to report thread stacks 2016-10-20 09:21:41 +02:00
firmware_class
fmc
fpga
frv
gpio Merge branch 'gpio-irq-validmask' of /home/linus/linux-pinctrl into devel 2016-09-23 14:51:18 +02:00
gpu Merge tag 'drm-for-v4.9' of git://people.freedesktop.org/~airlied/linux 2016-10-11 18:12:22 -07:00
hid
hwmon
i2c
ia64
ide
iio iio: Documentation: Correct the path used to create triggers. 2016-10-01 00:49:58 -06:00
infiniband IB/hfi1: Document new sysfs entries for hfi1 driver 2016-10-02 08:42:19 -04:00
input Input: ALPS - add V8 protocol documentation 2016-10-04 11:47:02 -07:00
ioctl
isdn
ja_JP
kbuild Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
kdump
ko_KR
laptops tools: move laptops dslm tool from Documentation 2016-09-23 13:07:21 -06:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds 2016-10-04 10:25:53 -07:00
livepatch
locking locking/lglock: Remove lglock implementation 2016-09-22 15:25:56 +02:00
m68k
media Linux 4.8 2016-10-05 16:43:53 -03:00
memory-devices
metag
mic
mips
misc-devices samples: move misc-devices/mei example code from Documentation 2016-09-23 11:51:43 -06:00
mmc
mn10300
mtd
namespaces
netlabel
networking linux-kselftest-4.9-rc1-update 2016-10-14 15:17:12 -07:00
nfc
nios2
nvdimm
nvmem
parisc
PCI PCI changes for the v4.9 merge window: 2016-10-07 11:46:37 -07:00
pcmcia tools: move pcmcia crc32hash tool from Documentation 2016-09-23 13:07:27 -06:00
perf
phy
platform
power power supply and reset changes for the v4.9 series 2016-10-06 18:21:15 -07:00
powerpc powerpc updates for 4.9 2016-10-07 20:19:31 -07:00
pps
prctl
pti
ptp
rapidio
RCU kthread: kthread worker API cleanup 2016-10-11 15:06:33 -07:00
s390
scheduler
scsi scsi: g_NCR5380: Stop using scsi_module.c 2016-09-29 21:52:43 -04:00
security
serial
sh
sound
sphinx
sphinx-static This is the documentation update pull for the 4.9 merge window. 2016-10-04 13:54:07 -07:00
spi Doc: update 00-INDEX files to reflect the runnable code move 2016-10-10 07:12:09 -06:00
sysctl mnt: Add a per mount namespace limit on the number of mounts 2016-09-30 12:46:48 -05:00
target
thermal thermal: Add support for hardware-tracked trip points 2016-09-27 14:02:16 +08:00
timers Doc: update 00-INDEX files to reflect the runnable code move 2016-10-10 07:12:09 -06:00
tpm
trace This release cycle is rather small. Just a few fixes to tracing. 2016-10-06 11:48:41 -07:00
usb
virtual KVM: arm64: Require in-kernel irqchip for PMU support 2016-09-27 18:57:07 +02:00
vm
w1
watchdog linux-kselftest-4.9-rc1-update 2016-10-14 15:17:12 -07:00
wimax
x86 Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-10 11:01:51 -07:00
xtensa
zh_CN
.gitignore
00-INDEX Doc: update 00-INDEX files to reflect the runnable code move 2016-10-10 07:12:09 -06:00
adding-syscalls.txt
applying-patches.txt
assoc_array.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
bcache.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt
Changes
circular-buffers.txt
clk.txt
CodeOfConflict URL changed for Linux Foundation TAB 2016-10-01 00:57:13 -06:00
CodingStyle
conf.py media updates for v4.9-rc1 2016-10-11 13:22:22 -07:00
cpu-hotplug.txt
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt dma-mapping: add dma_{map,unmap}_resource 2016-09-26 22:16:41 +05:30
DMA-attributes.txt dma-mapping: introduce the DMA_ATTR_NO_WARN attribute 2016-10-11 15:06:32 -07:00
dma-buf-sharing.txt
DMA-ISA-LPC.txt
docutils.conf
dontdiff
dynamic-debug-howto.txt
edac.txt
efi-stub.txt
eisa.txt
email-clients.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
HOWTO
hw_random.txt
hwspinlock.txt
index.rst docs-rst: sphinxify 802.11 documentation 2016-10-11 16:19:17 -06:00
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-documentation.rst This is the documentation update pull for the 4.9 merge window. 2016-10-04 13:54:07 -07:00
kernel-parameters.txt Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2016-10-14 13:19:30 -07:00
kernel-per-CPU-kthreads.txt
kobject.txt
kprobes.txt
kref.txt
kselftest.txt
ldm.txt
local_ops.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lzo.txt
magic-number.txt
mailbox.txt
Makefile samples: move blackfin gptimers-example from Documentation 2016-10-10 07:12:02 -06:00
Makefile.sphinx
ManagementStyle
md-cluster.txt
md.txt
memory-barriers.txt
memory-hotplug.txt
men-chameleon-bus.txt
module-signing.txt
mono.txt
nommu-mmap.txt
ntb.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pinctrl.txt
pnp.txt
preempt-locking.txt
printk-formats.txt
pwm.txt
ramoops.txt
rbtree.txt
remoteproc.txt remoteproc: Split driver and consumer dereferencing 2016-10-02 22:50:21 -07:00
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
SM501.txt
smsc_ece1099.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt
SubmitChecklist
SubmittingDrivers
SubmittingPatches
svga.txt
sync_file.txt
sysfs-rules.txt
sysrq.txt
this_cpu_ops.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt
VGA-softcursor.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt
xillybus.txt
xz.txt
zorro.txt