Borislav Petkov (AMD) acdc883eb6 x86/srso: Add a Speculative RAS Overflow mitigation ... Upstream commit: fb3bd914b3 Add a mitigation for the speculative return address stack overflow vulnerability found on AMD processors. The mitigation works by ensuring all RET instructions speculate to a controlled location, similar to how speculation is controlled in the retpoline sequence. To accomplish this, the __x86_return_thunk forces the CPU to mispredict every function return using a 'safe return' sequence. To ensure the safety of this mitigation, the kernel must ensure that the safe return sequence is itself free from attacker interference. In Zen3 and Zen4, this is accomplished by creating a BTB alias between the untraining function srso_untrain_ret_alias() and the safe return function srso_safe_ret_alias() which results in evicting a potentially poisoned BTB entry and using that safe one for all function returns. In older Zen1 and Zen2, this is accomplished using a reinterpretation technique similar to Retbleed one: srso_untrain_ret() and srso_safe_ret(). Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-08-08 20:04:51 +02:00
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accounting	delayacct: track delays from IRQ/SOFTIRQ	2023-04-18 16:39:34 -07:00
arch	x86/bugs: Increase the x86 bugs vector size to two u32s	2023-08-08 20:04:51 +02:00
bootconfig
bpf	tools/resolve_btfids: Fix setting HOSTCFLAGS	2023-07-19 16:35:26 +02:00
build
certs
cgroup
counter
debugging
edid
firewire
firmware
gpio	tools: gpio: fix debounce_period_us output of lsgpio	2023-05-11 10:56:24 +02:00
hv
iio
include	tools/nolibc: ensure stack protector guard is never zero	2023-07-27 08:56:48 +02:00
io_uring
kvm/kvm_stat
laptop
leds
lib	libbpf: fix offsetof() and container_of() to work with CO-RE	2023-07-19 16:35:23 +02:00
memory-model	LKMM scripting updates for v6.4	2023-04-24 12:02:25 -07:00
mm	slab changes for 6.4	2023-04-25 13:00:41 -07:00
net/ynl	tools: ynl-gen: fix enum index in _decode_enum(..)	2023-08-03 10:25:53 +02:00
objtool	x86/srso: Add a Speculative RAS Overflow mitigation	2023-08-08 20:04:51 +02:00
pci
pcmcia
perf	perf build: Fix library not found error when using CSLIBS	2023-07-27 08:56:54 +02:00
power	cpupower: Make TSC read per CPU for Mperf monitor	2023-05-08 10:46:49 -06:00
rcu
scripts	sh updates for v6.4	2023-04-27 17:41:23 -07:00
spi
testing	selftests: mptcp: join: only check for ip6tables if needed	2023-08-03 10:26:10 +02:00
thermal
time
tracing	rtla/hwnoise: Reduce runtime to 75%	2023-07-19 16:36:36 +02:00
usb
verification	rv: Fix addition on an uninitialized variable 'run'	2023-04-25 17:02:13 -04:00
virtio	tools/virtio: fix build break for aarch64	2023-07-19 16:36:41 +02:00
wmi
Makefile	tools/Makefile: do missed s/vm/mm/	2023-04-18 14:22:12 -07:00