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xen
x86_64-sysret-canonical.patch
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File x86_64-sysret-canonical.patch of Package xen
References: CVE-2012-0217, bnc#757537 --- a/xen/arch/x86/x86_64/entry.S +++ b/xen/arch/x86/x86_64/entry.S @@ -40,6 +40,13 @@ restore_all_guest: testw $TRAP_syscall,4(%rsp) jz iret_exit_to_guest + /* Don't use SYSRET path if the return address is not canonical. */ + movq 8(%rsp),%rcx + sarq $47,%rcx + incl %ecx + cmpl $1,%ecx + ja .Lforce_iret + addq $8,%rsp popq %rcx # RIP popq %r11 # CS @@ -50,6 +57,10 @@ restore_all_guest: sysretq 1: sysretl +.Lforce_iret: + /* Mimic SYSRET behavior. */ + movq 8(%rsp),%rcx # RIP + movq 24(%rsp),%r11 # RFLAGS ALIGN /* No special register assumptions. */ iret_exit_to_guest:
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