Chris Wilson 1ea3602095 kcmp: Support selection of SYS_kcmp without CHECKPOINT_RESTORE ... commit bfe3911a91047557eb0e620f95a370aee6a248c7 upstream. Userspace has discovered the functionality offered by SYS_kcmp and has started to depend upon it. In particular, Mesa uses SYS_kcmp for os_same_file_description() in order to identify when two fd (e.g. device or dmabuf) point to the same struct file. Since they depend on it for core functionality, lift SYS_kcmp out of the non-default CONFIG_CHECKPOINT_RESTORE into the selectable syscall category. Rasmus Villemoes also pointed out that systemd uses SYS_kcmp to deduplicate the per-service file descriptor store. Note that some distributions such as Ubuntu are already enabling CHECKPOINT_RESTORE in their configs and so, by extension, SYS_kcmp. References: https://gitlab.freedesktop.org/drm/intel/-/issues/3046 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Will Drewry <wad@chromium.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Airlie <airlied@gmail.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: stable@vger.kernel.org Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> # DRM depends on kcmp Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> # systemd uses kcmp Reviewed-by: Cyrill Gorcunov <gorcunov@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20210205220012.1983-1-chris@chris-wilson.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-03-04 11:38:41 +01:00
..
accounting
arch	x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes	2020-12-06 09:58:13 +01:00
bootconfig	tools/bootconfig: Add tracing_on support to helper scripts	2021-01-19 18:27:19 +01:00
bpf	tools: Factor HOSTCC, HOSTLD, HOSTAR definitions	2021-01-30 13:55:19 +01:00
build	tools: Factor HOSTCC, HOSTLD, HOSTAR definitions	2021-01-30 13:55:19 +01:00
cgroup
debugging
edid
firewire
firmware
gpio	tools: gpio: fix %llu warning in gpio-watch.c	2021-01-27 11:55:20 +01:00
hv
iio
include	tools headers UAPI: Sync linux/fscrypt.h with the kernel sources	2021-01-17 14:17:06 +01:00
io_uring
kvm/kvm_stat	tools/kvm_stat: Exempt time-based counters	2020-12-11 19:18:51 -05:00
laptop
leds
lib	libbpf: Ignore non function pointer member in struct_ops	2021-03-04 11:37:33 +01:00
memory-model
objtool	objtool: Fix ".cold" section suffix check for newer versions of GCC	2021-03-04 11:38:00 +01:00
pci
pcmcia
perf	perf test: Fix unaligned access in sample parsing test	2021-03-04 11:38:10 +01:00
power	tools/power/x86/intel-speed-select: Set higher of cpuinfo_max_freq or base_frequency	2021-02-07 15:37:13 +01:00
scripts	tools: Factor HOSTCC, HOSTLD, HOSTAR definitions	2021-01-30 13:55:19 +01:00
spi
testing	kcmp: Support selection of SYS_kcmp without CHECKPOINT_RESTORE	2021-03-04 11:38:41 +01:00
thermal/tmon
time
usb
virtio
vm
wmi
Makefile