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Adrian Ratiu 72291ae00f proc: add config & param to block forcing mem writes 
[ Upstream commit 41e8149c8892ed1962bd15350b3c3e6e90cba7f4 ]

This adds a Kconfig option and boot param to allow removing
the FOLL_FORCE flag from /proc/pid/mem write calls because
it can be abused.

The traditional forcing behavior is kept as default because
it can break GDB and some other use cases.

Previously we tried a more sophisticated approach allowing
distributions to fine-tune /proc/pid/mem behavior, however
that got NAK-ed by Linus [1], who prefers this simpler
approach with semantics also easier to understand for users.

Link: https://lore.kernel.org/lkml/CAHk-=wiGWLChxYmUA5HrT5aopZrB7_2VTa0NLZcxORgkUe5tEQ@mail.gmail.com/ [1]
Cc: Doug Anderson <dianders@chromium.org>
Cc: Jeff Xu <jeffxu@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Link: https://lore.kernel.org/r/20240802080225.89408-1-adrian.ratiu@collabora.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-23 23:21:39 +01:00
..
ABI PM / devfreq: Fix buffer overflow in trans_stat_show 2024-11-19 11:32:38 +01:00
accounting Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
admin-guide proc: add config & param to block forcing mem writes 2024-11-23 23:21:39 +01:00
arm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
arm64 arm64: cpufeature: Fix the visibility of compat hwcaps 2024-11-23 23:20:31 +01:00
block bvec/iter: disallow zero-length segment bvecs 2024-11-19 17:42:21 +01:00
bpf Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cdrom Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
core-api Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cpu-freq Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
crypto Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dev-tools Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
device-mapper Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
devicetree dt-bindings: thermal: correct thermal zone node name limit 2024-11-23 23:20:12 +01:00
doc-guide Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
driver-api ipmi: docs: don't advertise deprecated sysfs entries 2024-11-23 23:21:22 +01:00
fault-injection Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fb Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
features Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
filesystems bvec/iter: disallow zero-length segment bvecs 2024-11-19 17:42:21 +01:00
firmware-guide Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
firmware_class Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fpga Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
gpu Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
hid Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
hwmon Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ia64 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ide Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
iio Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
infiniband Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
input Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
isdn Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kbuild Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kernel-hacking Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
leds Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
litmus-tests Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
livepatch Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
locking hwspinlock: Introduce hwspin_lock_bust() 2024-11-23 23:20:58 +01:00
m68k Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
maintainer Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mhi Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mips Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
misc-devices Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
netlabel Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
networking net: change accept_ra_min_rtr_lft to affect all RA lifetimes 2024-11-08 11:25:47 +01:00
nios2 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nvdimm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
openrisc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
parisc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
PCI Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pcmcia Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
power Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
powerpc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
process overflow: Implement size_t saturating arithmetic helpers 2024-11-18 11:42:47 +01:00
RCU Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
riscv Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
s390 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
scheduler Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
scsi Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
security Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sh Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sound ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument 2024-11-18 12:13:17 +01:00
sparc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sphinx docs: kernel_include.py: Cope with docutils 0.21 2024-11-19 12:26:50 +01:00
sphinx-static Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
spi Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
staging Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
target Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
timers Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace mm/lru: revise the comments of lru_lock 2024-11-19 17:58:24 +01:00
translations Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
usb Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
userspace-api Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
virt Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
vm mm/lru: revise the comments of lru_lock 2024-11-19 17:58:24 +01:00
w1 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
watchdog Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
x86 x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 2024-11-19 09:22:40 +01:00
xtensa Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
asm-annotations.rst Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
atomic_bitops.txt Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
atomic_t.txt Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Changes Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
CodingStyle Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
conf.py Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
COPYING-logo Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
docutils.conf Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dontdiff Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
index.rst Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
logo.gif Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
memory-barriers.txt Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
SubmittingPatches Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
watch_queue.rst Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00