x86/bpf: Use alternative RET encoding
stable inclusion from stable-v5.10.133 commit e0e06a922706204df43d50032c05af75d8e75f8e 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=e0e06a922706204df43d50032c05af75d8e75f8e -------------------------------- commit d77cfe59 upstream. Use the return thunk in eBPF generated code, if needed. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NBorislav Petkov <bp@suse.de> Reviewed-by: NJosh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: NBorislav Petkov <bp@suse.de> Signed-off-by: NThadeu Lima de Souza Cascardo <cascardo@canonical.com> [bwh: Backported to 5.10: add the necessary cnt variable to emit_return()] Signed-off-by: NBen Hutchings <ben@decadent.org.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NLin Yujun <linyujun809@huawei.com> Reviewed-by: NZhang Jianhua <chris.zjh@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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