Jann Horn b92e9f7565 x86/entry: Fix ORC unwinder for PUSH_REGS with save_ret=1 ... [ Upstream commit 57e2428f8df8263275344566e02c277648a4b7f1 ] PUSH_REGS with save_ret=1 is used by interrupt entry helper functions that initially start with a UNWIND_HINT_FUNC ORC state. However, save_ret=1 means that we clobber the helper function's return address (and then later restore the return address further down on the stack); after that point, the only thing on the stack we can unwind through is the IRET frame, so use UNWIND_HINT_IRET_REGS until we have a full pt_regs frame. ( An alternate approach would be to move the pt_regs->di overwrite down such that it is the final step of pt_regs setup; but I don't want to rearrange entry code just to make unwinding a tiny bit more elegant. ) Fixes: 9e809d15d6 ("x86/entry: Reduce the code footprint of the 'idtentry' macro") Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Kees Cook <keescook@chromium.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20250325-2025-03-unwind-fixes-v1-1-acd774364768@google.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-04-10 14:33:35 +02:00
..
syscalls
vdso
vsyscall
calling.h	x86/entry: Fix ORC unwinder for PUSH_REGS with save_ret=1	2025-04-10 14:33:35 +02:00
common.c
entry_32.S	x86/entry_32: Clear CPU buffers after register restore in NMI return	2024-10-22 15:56:50 +02:00
entry_64_compat.S
entry_64.S
entry.S
Makefile
syscall_32.c
syscall_64.c
syscall_x32.c
thunk_32.S
thunk_64.S