Linux Kernel https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v6.0.14 2022-06-29T15:43:41Z 2022-06-29T15:43:41Z Peter Zijlstra peterz@infradead.org 2022-06-27T22:21:17Z urn:sha1:f43b9876e857c739d407bc56df288b0ebe1a9164 Do fine-grained Kconfig for all the various retbleed parts. NOTE: if your compiler doesn't support return thunks this will silently 'upgrade' your mitigation to IBPB, you might not like this. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> 2022-06-27T08:34:00Z Peter Zijlstra peterz@infradead.org 2022-06-14T21:16:03Z urn:sha1:a09a6e2399ba0595c3042b3164f3ca68a3cff33e 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> 2022-06-04T21:20:57Z Masahiro Yamada masahiroy@kernel.org 2022-05-28T15:47:04Z urn:sha1:b42d2306502419688190aa6dd4dab4a6def24b3d scripts/Makefile.build and scripts/link-vmlinux.sh have similar setups for the objtool arguments. It was difficult to factor out them because all the vmlinux build rules were written in a shell script. It is somewhat tedious to touch the two files every time a new objtool option is supported. To reduce the code duplication, move the objtool for vmlinux.o into scripts/Makefile.vmlinux_o. Then, move the common macros to Makefile.lib so they are shared between Makefile.build and Makefile.vmlinux_o. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64) 2022-06-04T21:20:57Z Masahiro Yamada masahiroy@kernel.org 2022-05-28T15:47:03Z urn:sha1:5d45950dfbb1540bba3e3762a3497de8b4a715d3 This is a preparation for moving the objtool rule in the next commit. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)