Re: [PATCH 7/7] x86/entry/64: extend register clearing on syscall entry to lower registers

* Dominik Brodowski wrote: > .endif > pushq \rdx/* pt_regs->dx */ > + xorl%edx, %edx /* nosepc dx */ > pushq %rcx/* pt_regs->cx */ > + xorl%ecx, %ecx /* nosepc cx */ > pushq \rax

Re: [PATCH 7/7] x86/entry/64: extend register clearing on syscall entry to lower registers

* Dominik Brodowski wrote: > .endif > pushq \rdx/* pt_regs->dx */ > + xorl%edx, %edx /* nosepc dx */ > pushq %rcx/* pt_regs->cx */ > + xorl%ecx, %ecx /* nosepc cx */ > pushq \rax/* pt_regs->ax */ >

[PATCH 7/7] x86/entry/64: extend register clearing on syscall entry to lower registers

To reduce the chance that random user space content leaks down the call chain in registers, also clear lower registers on syscall entry: For 64bit syscalls, extend the register clearing in PUSH_AND_CLEAR_REGS to %dx and %cx. This should not hurt at all, also on the other callers of that macro. We

[PATCH 7/7] x86/entry/64: extend register clearing on syscall entry to lower registers

To reduce the chance that random user space content leaks down the call chain in registers, also clear lower registers on syscall entry: For 64bit syscalls, extend the register clearing in PUSH_AND_CLEAR_REGS to %dx and %cx. This should not hurt at all, also on the other callers of that macro. We