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| author | David S. Miller <davem@davemloft.net> | 2018-01-19 22:59:33 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-19 22:59:33 -0500 |
| commit | 8565d26bcb2ff6df646e946d2913fcf706d46b66 (patch) | |
| tree | 21ffaccc3cbac5e558d51c20cfbecbfec86a02c4 /arch/x86/entry/entry_64.S | |
| parent | 85831e56a1d0c75a1560e61acbb8591e9f11c6b7 (diff) | |
| parent | ec835f8104a21f4d4eeb9d316ee71d2b4a7f00de (diff) | |
| download | op-kernel-dev-8565d26bcb2ff6df646e946d2913fcf706d46b66.zip op-kernel-dev-8565d26bcb2ff6df646e946d2913fcf706d46b66.tar.gz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
The BPF verifier conflict was some minor contextual issue.
The TUN conflict was less trivial. Cong Wang fixed a memory leak of
tfile->tx_array in 'net'. This is an skb_array. But meanwhile in
net-next tun changed tfile->tx_arry into tfile->tx_ring which is a
ptr_ring.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/x86/entry/entry_64.S')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 4f8e1d3..aa15b4c 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -491,6 +491,17 @@ ENTRY(__switch_to_asm) movq %rbx, PER_CPU_VAR(irq_stack_union)+stack_canary_offset #endif +#ifdef CONFIG_RETPOLINE + /* + * When switching from a shallower to a deeper call stack + * the RSB may either underflow or use entries populated + * with userspace addresses. On CPUs where those concerns + * exist, overwrite the RSB with entries which capture + * speculative execution to prevent attack. + */ + FILL_RETURN_BUFFER %r12, RSB_CLEAR_LOOPS, X86_FEATURE_RSB_CTXSW +#endif + /* restore callee-saved registers */ popq %r15 popq %r14 |
