On Mon, May 20, 2019 at 04:19:33PM -0700, Thomas Garnier wrote: > From: Thomas Garnier <[email protected]> > > Change the assembly code to use only relative references of symbols for the > kernel to be PIE compatible. > > Position Independent Executable (PIE) support will allow to extend the > KASLR randomization range below 0xffffffff80000000. > > Signed-off-by: Thomas Garnier <[email protected]>
Reviewed-by: Kees Cook <[email protected]> -Kees > Acked-by: Pavel Machek <[email protected]> > Acked-by: Rafael J. Wysocki <[email protected]> > --- > arch/x86/kernel/acpi/wakeup_64.S | 31 ++++++++++++++++--------------- > 1 file changed, 16 insertions(+), 15 deletions(-) > > diff --git a/arch/x86/kernel/acpi/wakeup_64.S > b/arch/x86/kernel/acpi/wakeup_64.S > index 510fa12aab73..e080e943e295 100644 > --- a/arch/x86/kernel/acpi/wakeup_64.S > +++ b/arch/x86/kernel/acpi/wakeup_64.S > @@ -14,7 +14,7 @@ > * Hooray, we are in Long 64-bit mode (but still running in low memory) > */ > ENTRY(wakeup_long64) > - movq saved_magic, %rax > + movq saved_magic(%rip), %rax > movq $0x123456789abcdef0, %rdx > cmpq %rdx, %rax > jne bogus_64_magic > @@ -25,14 +25,14 @@ ENTRY(wakeup_long64) > movw %ax, %es > movw %ax, %fs > movw %ax, %gs > - movq saved_rsp, %rsp > + movq saved_rsp(%rip), %rsp > > - movq saved_rbx, %rbx > - movq saved_rdi, %rdi > - movq saved_rsi, %rsi > - movq saved_rbp, %rbp > + movq saved_rbx(%rip), %rbx > + movq saved_rdi(%rip), %rdi > + movq saved_rsi(%rip), %rsi > + movq saved_rbp(%rip), %rbp > > - movq saved_rip, %rax > + movq saved_rip(%rip), %rax > jmp *%rax > ENDPROC(wakeup_long64) > > @@ -45,7 +45,7 @@ ENTRY(do_suspend_lowlevel) > xorl %eax, %eax > call save_processor_state > > - movq $saved_context, %rax > + leaq saved_context(%rip), %rax > movq %rsp, pt_regs_sp(%rax) > movq %rbp, pt_regs_bp(%rax) > movq %rsi, pt_regs_si(%rax) > @@ -64,13 +64,14 @@ ENTRY(do_suspend_lowlevel) > pushfq > popq pt_regs_flags(%rax) > > - movq $.Lresume_point, saved_rip(%rip) > + leaq .Lresume_point(%rip), %rax > + movq %rax, saved_rip(%rip) > > - movq %rsp, saved_rsp > - movq %rbp, saved_rbp > - movq %rbx, saved_rbx > - movq %rdi, saved_rdi > - movq %rsi, saved_rsi > + movq %rsp, saved_rsp(%rip) > + movq %rbp, saved_rbp(%rip) > + movq %rbx, saved_rbx(%rip) > + movq %rdi, saved_rdi(%rip) > + movq %rsi, saved_rsi(%rip) > > addq $8, %rsp > movl $3, %edi > @@ -82,7 +83,7 @@ ENTRY(do_suspend_lowlevel) > .align 4 > .Lresume_point: > /* We don't restore %rax, it must be 0 anyway */ > - movq $saved_context, %rax > + leaq saved_context(%rip), %rax > movq saved_context_cr4(%rax), %rbx > movq %rbx, %cr4 > movq saved_context_cr3(%rax), %rbx > -- > 2.21.0.1020.gf2820cf01a-goog > -- Kees Cook
