Alexandre Chartre d16e0b2667 x86/entry: Remove UNTRAIN_RET from native_irq_return_ldt ...

UNTRAIN_RET is not needed in native_irq_return_ldt because RET
untraining has already been done at this point.

In addition, when the RETBleed mitigation is IBPB, UNTRAIN_RET clobbers
several registers (AX, CX, DX) so here it trashes user values which are
in these registers.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/35b0d50f-12d1-10c3-f5e8-d6c140486d4a@oracle.com

2022-07-14 09:45:12 +02:00

..

syscalls

Kbuild updates for v5.18

2022-03-31 11:59:03 -07:00

vdso

x86: Use return-thunk in asm code

2022-06-27 10:33:58 +02:00

vsyscall

x86/vsyscall_emu/64: Don't use RET in vsyscall emulation

2022-06-27 10:33:58 +02:00

calling.h

x86/retbleed: Add fine grained Kconfig knobs

2022-06-29 17:43:41 +02:00

common.c

X86 entry code related updates:

2021-06-29 12:44:51 -07:00

entry_32.S

x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n

2022-06-27 10:34:00 +02:00

entry_64_compat.S

objtool: Add entry UNRET validation

2022-06-27 10:34:00 +02:00

entry_64.S

x86/entry: Remove UNTRAIN_RET from native_irq_return_ldt

2022-07-14 09:45:12 +02:00

entry.S

x86/bugs: Add retbleed=ibpb

2022-06-27 10:34:00 +02:00

Makefile

x86/bugs: Add retbleed=ibpb

2022-06-27 10:34:00 +02:00

syscall_32.c

x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall

2021-05-20 15:03:59 +02:00

syscall_64.c

x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall

2021-05-20 15:03:59 +02:00

syscall_x32.c

x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall

2021-05-20 15:03:59 +02:00

thunk_32.S

x86: Prepare asm files for straight-line-speculation

2021-12-08 12:25:37 +01:00

thunk_64.S

x86: Prepare asm files for straight-line-speculation

2021-12-08 12:25:37 +01:00