Peter Zijlstra dab72c3c32 objtool: Add entry UNRET validation ... commit a09a6e2399 upstream. Since entry asm is tricky, add a validation pass that ensures the retbleed mitigation has been done before the first actual RET instruction. Entry points are those that either have UNWIND_HINT_ENTRY, which acts as UNWIND_HINT_EMPTY but marks the instruction as an entry point, or those that have UWIND_HINT_IRET_REGS at +0. This is basically a variant of validate_branch() that is intra-function and it will simply follow all branches from marked entry points and ensures that all paths lead to ANNOTATE_UNRET_END. If a path hits RET or an indirection the path is a fail and will be reported. There are 3 ANNOTATE_UNRET_END instances: - UNTRAIN_RET itself - exception from-kernel; this path doesn't need UNTRAIN_RET - all early exceptions; these also don't need UNTRAIN_RET Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> [cascardo: tools/objtool/builtin-check.c no link option validation] [cascardo: tools/objtool/check.c opts.ibt is ibt] [cascardo: tools/objtool/include/objtool/builtin.h leave unret option as bool, no struct opts] [cascardo: objtool is still called from scripts/link-vmlinux.sh] [cascardo: no IBT support] Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-07-23 12:54:06 +02:00
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accounting
arch	KVM: x86/speculation: Disable Fill buffer clear within guests	2022-06-16 13:30:34 +02:00
bootconfig	tools/bootconfig: Define memblock_free_ptr() to fix build error	2021-09-15 09:49:48 -07:00
bpf	bpftool: Fix the error when lookup in no-btf maps	2022-04-08 14:23:31 +02:00
build	perf build: Fix btf__load_from_kernel_by_id() feature check	2022-06-09 10:23:16 +02:00
cgroup
debugging
edid
firewire
firmware
gpio
hv
iio
include	objtool: Add entry UNRET validation	2022-07-23 12:54:06 +02:00
io_uring
kvm/kvm_stat	KVM: kvm_stat: do not show halt_wait_ns	2021-10-18 14:07:18 -04:00
laptop
leds
lib	libbpf: Fix logic for finding matching program for CO-RE relocation	2022-06-09 10:22:51 +02:00
memory-model
objtool	objtool: Add entry UNRET validation	2022-07-23 12:54:06 +02:00
pci
pcmcia
perf	perf build-id: Fix caching files with a wrong build ID	2022-06-29 09:03:31 +02:00
power	tools/power turbostat: fix ICX DRAM power numbers	2022-06-09 10:22:32 +02:00
rcu
scripts
spi
testing	selftests/net: fix section name when using xdp_dummy.o	2022-07-12 16:35:19 +02:00
thermal/tmon
time
tracing	tools/latency-collector: Use correct size when writing queue_full_warning	2021-11-18 19:16:19 +01:00
usb	usb: testusb: Fix for showing the connection speed	2021-09-14 10:31:41 +02:00
virtio	tools/virtio: compile with -pthread	2022-05-25 09:57:25 +02:00
vm	tools/vm/page-types: remove dependency on opt_file for idle page tracking	2021-09-24 16:13:35 -07:00
wmi
Makefile