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Alexei Starovoitov af86ca4e30 bpf: Prevent memory disambiguation attack 
Detect code patterns where malicious 'speculative store bypass' can be used
and sanitize such patterns.

 39: (bf) r3 = r10
 40: (07) r3 += -216
 41: (79) r8 = *(u64 *)(r7 +0)   // slow read
 42: (7a) *(u64 *)(r10 -72) = 0  // verifier inserts this instruction
 43: (7b) *(u64 *)(r8 +0) = r3   // this store becomes slow due to r8
 44: (79) r1 = *(u64 *)(r6 +0)   // cpu speculatively executes this load
 45: (71) r2 = *(u8 *)(r1 +0)    // speculatively arbitrary 'load byte'
                                 // is now sanitized

Above code after x86 JIT becomes:
 e5: mov    %rbp,%rdx
 e8: add    $0xffffffffffffff28,%rdx
 ef: mov    0x0(%r13),%r14
 f3: movq   $0x0,-0x48(%rbp)
 fb: mov    %rdx,0x0(%r14)
 ff: mov    0x0(%rbx),%rdi
103: movzbq 0x0(%rdi),%rsi

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2018-05-19 20:44:24 +02:00
..
acpi xen: fixes for 4.17-rc1 2018-04-12 11:04:35 -07:00
asm-generic earlycon: Use a pointer table to fix __earlycon_table stride 2018-04-23 10:06:59 +02:00
clocksource ARM: SoC platform updates for 4.17 2018-04-05 21:21:08 -07:00
crypto
drm drm: Fix HDCP downstream dev count read 2018-04-16 12:10:48 -04:00
dt-bindings The large diff this time around is from the addition of a new clk driver 2018-04-13 15:51:06 -07:00
keys
kvm arm/arm64: KVM: Add PSCI version selection API 2018-04-20 16:32:23 +01:00
linux bpf: Prevent memory disambiguation attack 2018-05-19 20:44:24 +02:00
math-emu
media media updates for v4.17-rc1 2018-04-10 10:10:30 -07:00
memory
misc
net net: sched: ife: handle malformed tlv length 2018-04-22 21:12:00 -04:00
pcmcia
ras
rdma Merge candidates for 4.17 merge window 2018-04-06 17:35:43 -07:00
scsi scsi: core: remove reference to scsi_show_extd_sense() 2018-04-18 23:37:39 -04:00
soc soc: bcm2835: Make !RASPBERRYPI_FIRMWARE dummies return failure 2018-04-16 15:15:23 -07:00
sound ALSA: control: Hardening for potential Spectre v1 2018-04-25 10:37:46 +02:00
target
trace Following tracing fixes: 2018-04-26 16:22:47 -07:00
uapi seccomp: Add filter flag to opt-out of SSB mitigation 2018-05-05 00:51:44 +02:00
video
xen xen/sndif: Sync up with the canonical definition in Xen 2018-04-17 08:26:33 -04:00