KP Singh 08d87c87d6 x86/speculation: Allow enabling STIBP with legacy IBRS ... commit 6921ed9049 upstream. When plain IBRS is enabled (not enhanced IBRS), the logic in spectre_v2_user_select_mitigation() determines that STIBP is not needed. The IBRS bit implicitly protects against cross-thread branch target injection. However, with legacy IBRS, the IBRS bit is cleared on returning to userspace for performance reasons which leaves userspace threads vulnerable to cross-thread branch target injection against which STIBP protects. Exclude IBRS from the spectre_v2_in_ibrs_mode() check to allow for enabling STIBP (through seccomp/prctl() by default or always-on, if selected by spectre_v2_user kernel cmdline parameter). [ bp: Massage. ] Fixes: 7c693f54c8 ("x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS") Reported-by: José Oliveira <joseloliveira11@gmail.com> Reported-by: Rodrigo Branco <rodrigo@kernelhacking.com> Signed-off-by: KP Singh <kpsingh@kernel.org> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230220120127.1975241-1-kpsingh@kernel.org Link: https://lore.kernel.org/r/20230221184908.2349578-1-kpsingh@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-03-10 09:34:14 +01:00
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alpha	alpha/boot/tools/objstrip: fix the check for ELF header	2023-03-10 09:33:30 +01:00
arc	…
arm	ARM: dts: exynos: correct HDMI phy compatible in Exynos4	2023-03-10 09:34:07 +01:00
arm64	arm64: zynqmp: Enable hs termination flag for USB dwc3 controller	2023-03-10 09:33:46 +01:00
csky	…
hexagon	…
ia64	ia64: fix build error due to switch case label appearing next to declaration	2023-02-09 11:28:23 +01:00
loongarch	LoongArch, bpf: Use 4 instructions for function address in JIT	2023-03-10 09:33:06 +01:00
m68k	m68k: Check syscall_trace_enter() return code	2023-03-10 09:33:51 +01:00
microblaze	…
mips	of/fdt: run soc memory setup when early_init_dt_scan_memory fails	2023-01-12 12:02:51 +01:00
nios2	…
openrisc	…
parisc	parisc: Wire up PTRACE_GETREGS/PTRACE_SETREGS for compat case	2023-02-09 11:28:20 +01:00
powerpc	powerpc: Remove linker flag from KBUILD_AFLAGS	2023-03-10 09:33:41 +01:00
riscv	RISC-V: time: initialize hrtimer based broadcast clock event device	2023-03-10 09:33:03 +01:00
s390	KVM: s390: disable migration mode when dirty tracking is disabled	2023-03-10 09:34:05 +01:00
sh	sh: define RUNTIME_DISCARD_EXIT	2023-02-25 11:25:42 +01:00
sparc	sparc: allow PM configs for sparc32 COMPILE_TEST	2023-03-10 09:33:27 +01:00
um	um: virt-pci: Avoid GCC non-NULL warning	2023-01-07 11:11:52 +01:00
x86	x86/speculation: Allow enabling STIBP with legacy IBRS	2023-03-10 09:34:14 +01:00
xtensa	xtensa: add __umulsidi3 helper	2023-01-07 11:11:46 +01:00
.gitignore	…
Kconfig	ftrace: Allow WITH_ARGS flavour of graph tracer with shadow call stack	2022-12-31 13:32:45 +01:00