From: Peter Zijlstra <peterz@infradead.org> stable inclusion from stable-v5.10.133 commit 8e2774270aa319f552fab969bc4500e412d2566b category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 564d998106397394b6aad260f219b882b3347e62 upstream. Implement apply_returns() stub for UM, just like all the other patching routines. Fixes: 15e67227c49a ("x86: Undo return-thunk damage") Reported-by: Randy Dunlap <rdunlap@infradead.org) Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/Ys%2Ft45l%2FgarIrD0u@worktop.programming.kicks-ass... Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Lin Yujun <linyujun809@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- arch/um/kernel/um_arch.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 2676ac322146..26af24b5d900 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -362,6 +362,10 @@ void apply_retpolines(s32 *start, s32 *end) { } +void apply_returns(s32 *start, s32 *end) +{ +} + void apply_alternatives(struct alt_instr *start, struct alt_instr *end) { } -- 2.20.1