https://bugzilla.kernel.org/show_bug.cgi?id=65561 --- Comment #20 from Jidong Xiao <jidong.xiao@xxxxxxxxx> --- Thanks Jatin, I actually tried some other instructions, like accessing cr register. I use the following program: linux:~/code/cvedr # cat getcr.c #include <stdio.h> main(){ asm __volatile__ ( "mov %cr0, %eax\n" "mov %cr3, %ebx\n" ); printf("test cr\n"); } In x86_emulate_insn(), there is a piece of code like this (the printk is added by me.) ================================== case 0x20: /* mov cr, reg */ printk(KERN_ERR "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__); if (c->modrm_mod != 3) goto cannot_emulate; c->regs[c->modrm_rm] = realmode_get_cr(ctxt->vcpu, c->modrm_reg); c->dst.type = OP_NONE; /* no writeback */ break; ================================== My results show that the above c program does not trigger this printk statement neither. I assume accessing cr should be a privileged operation, right? So I am really curious that how to trigger these printk statements? -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
