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[PATCH for v4.9 LTS 01/86] sparc64: Handle PIO & MEM non-resumable errors.

From "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>
Newsgroups linux.kernel
Subject [PATCH for v4.9 LTS 01/86] sparc64: Handle PIO & MEM non-resumable errors.
Date 2017-06-18 00:30 +0200
Message-ID <tTuo9-58F-5@gated-at.bofh.it> (permalink)
Organization linux.* mail to news gateway

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From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

[ Upstream commit 047487241ff59374fded8c477f21453681f5995c ]

User processes trying to access an invalid memory address via PIO will
receive a SIGBUS signal instead of causing a panic.  Memory errors will
receive a SIGKILL since a SIGBUS may result in a coredump which may
attempt to repeat the faulting access.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
---
 arch/sparc/kernel/traps_64.c | 73 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index 496fa926e1e0..d44fb806bbd7 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2051,6 +2051,73 @@ void sun4v_resum_overflow(struct pt_regs *regs)
 	atomic_inc(&sun4v_resum_oflow_cnt);
 }
 
+/* Given a set of registers, get the virtual addressi that was being accessed
+ * by the faulting instructions at tpc.
+ */
+static unsigned long sun4v_get_vaddr(struct pt_regs *regs)
+{
+	unsigned int insn;
+
+	if (!copy_from_user(&insn, (void __user *)regs->tpc, 4)) {
+		return compute_effective_address(regs, insn,
+						 (insn >> 25) & 0x1f);
+	}
+	return 0;
+}
+
+/* Attempt to handle non-resumable errors generated from userspace.
+ * Returns true if the signal was handled, false otherwise.
+ */
+bool sun4v_nonresum_error_user_handled(struct pt_regs *regs,
+				  struct sun4v_error_entry *ent) {
+
+	unsigned int attrs = ent->err_attrs;
+
+	if (attrs & SUN4V_ERR_ATTRS_MEMORY) {
+		unsigned long addr = ent->err_raddr;
+		siginfo_t info;
+
+		if (addr == ~(u64)0) {
+			/* This seems highly unlikely to ever occur */
+			pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory error detected in unknown location!\n");
+		} else {
+			unsigned long page_cnt = DIV_ROUND_UP(ent->err_size,
+							      PAGE_SIZE);
+
+			/* Break the unfortunate news. */
+			pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory failed at %016lX\n",
+				 addr);
+			pr_emerg("SUN4V NON-RECOVERABLE ERROR:   Claiming %lu ages.\n",
+				 page_cnt);
+
+			while (page_cnt-- > 0) {
+				if (pfn_valid(addr >> PAGE_SHIFT))
+					get_page(pfn_to_page(addr >> PAGE_SHIFT));
+				addr += PAGE_SIZE;
+			}
+		}
+		info.si_signo = SIGKILL;
+		info.si_errno = 0;
+		info.si_trapno = 0;
+		force_sig_info(info.si_signo, &info, current);
+
+		return true;
+	}
+	if (attrs & SUN4V_ERR_ATTRS_PIO) {
+		siginfo_t info;
+
+		info.si_signo = SIGBUS;
+		info.si_code = BUS_ADRERR;
+		info.si_addr = (void __user *)sun4v_get_vaddr(regs);
+		force_sig_info(info.si_signo, &info, current);
+
+		return true;
+	}
+
+	/* Default to doing nothing */
+	return false;
+}
+
 /* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate.
  * Log the event, clear the first word of the entry, and die.
  */
@@ -2075,6 +2142,12 @@ void sun4v_nonresum_error(struct pt_regs *regs, unsigned long offset)
 
 	put_cpu();
 
+	if (!(regs->tstate & TSTATE_PRIV) &&
+	    sun4v_nonresum_error_user_handled(regs, &local_copy)) {
+		/* DON'T PANIC: This userspace error was handled. */
+		return;
+	}
+
 #ifdef CONFIG_PCI
 	/* Check for the special PCI poke sequence. */
 	if (pci_poke_in_progress && pci_poke_cpu == cpu) {
-- 
2.11.0

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[PATCH for v4.9 LTS 01/86] sparc64: Handle PIO & MEM non-resumable  errors. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 80/86] be2net: don't delete MAC on close on  unprivileged BE3 VFs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 81/86] be2net: fix MAC addr setting on privileged  BE3 VFs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 85/86] perf probe: Fix to probe on gcc generated  functions in modules "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 03/86] net: ethtool: add support for 2500BaseT  and 5000BaseT link modes "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 59/86] usb: gadget: composite: Fix function used  to free memory "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 79/86] be2net: fix status check in  be_cmd_pmac_add() "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 50/86] Documentation: devicetree: change the  mediatek ethernet compatible string "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 82/86] perf probe: Fix to show correct locations  for events on modules "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 84/86] tipc: allocate user memory with GFP_KERNEL  flag "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 22/86] net: phy: dp83848: add DP83620 PHY support "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 10/86] ARM64: dts: meson-gx: Add firmware  reserved memory zones "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 60/86] usb: dwc3: exynos fix axius clock error  path to do cleanup "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 20/86] drm/amdgpu: fix program vce instance logic  error. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 76/86] swiotlb: ensure that page-sized mappings  are page-aligned "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 32/86] Btrfs: fix truncate down when no_holes  feature is enabled "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 83/86] net: phy: dp83867: allow  RGMII_TXID/RGMII_RXID interface types "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 54/86] net: phy: marvell: fix Marvell 88E1512  used in SGMII mode "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 52/86] perf/x86/intel/uncore: Fix hardcoded  socket 0 assumption in the Haswell init code "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 65/86] drm/amd/powerplay: fix vce cg logic error  on CZ/St. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:30 +0200
  [PATCH for v4.9 LTS 43/86] vfio/spapr: fail tce_iommu_attach_group()  when iommu_data is null "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 33/86] virtio_console: fix a crash in  config_work_handler "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 55/86] mac80211: recalculate min channel width on  VHT opmode changes "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 49/86] kernel/panic.c: add missing \n "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 74/86] aio: fix lock dep warning "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 47/86] vxlan: do not age static remote mac  entries "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 36/86] xen-netfront: Fix Rx stall during network  stress and OOM "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 40/86] amd-xgbe: Check xgbe_init() return code "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 29/86] objtool: Fix IRET's opcode "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 67/86] pmem: return EIO on read_pmem() failure "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 56/86] perf/x86/intel: Use ULL constant to  prevent undefined shift behaviour "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 30/86] gianfar: Do not reuse pages from emergency  reserve "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 21/86] drm/amdgpu: add support for new hainan  variants "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 35/86] net: sctp: fix array overrun read on  sctp_timer_tbl "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 57/86] HID: i2c-hid: Add sleep between POWER ON  and RESET "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 46/86] ip6_tunnel: must reload ipv6h in  ip6ip6_tnl_xmit() "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 78/86] usb: dwc2: gadget: Fix GUSBCFG.USBTRDTIM  value "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 53/86] pinctrl: intel: Set pin direction properly "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 86/86] net/mlx4_core: Eliminate warning messages  for SRQ_LIMIT under SRIOV "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 42/86] drm/amdgpu: check ring being ready before  using "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 70/86] x86/tsc: Add the Intel Denverton Processor  to native_calibrate_tsc() "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 37/86] scsi: virtio_scsi: Reject commands when  virtqueue is broken "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 64/86] drm/radeon/si: load special ucode for  certain MC configs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 58/86] scsi: lpfc: avoid double free of resource  identifiers "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 51/86] drm/etnaviv: trick drm_mm into giving out  a low IOVA "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 62/86] arm64: assembler: make adr_l work in  modules under KASLR "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 69/86] KVM: arm64: Access CNTHCTL_EL2 bit fields  correctly on VHE systems "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 41/86] net: dsa: Check return value of  phy_connect_direct() "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 63/86] net: thunderx: acpi: fix LMAC  initialization "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 75/86] coredump: Ensure proper size of sparse  core files "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 71/86] x86/mpx: Use compatible types in  comparison to fix sparse error "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 44/86] mlxsw: spectrum_router: Correctly  reallocate adjacency entries "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 45/86] virtio_net: fix PAGE_SIZE > 64k "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 38/86] iwlwifi: fix kernel crash when  unregistering thermal zone "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 34/86] swiotlb-xen: update dev_addr after  swapping pages "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 68/86] mac80211: initialize SMPS field in HT  capabilities "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:40 +0200
  [PATCH for v4.9 LTS 14/86] KVM: x86: fix fixing of hypercalls "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 24/86] net: ethtool: Initialize buffer when  querying device channel settings "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 23/86] powerpc/eeh: Enable IO path on permanent  error "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 26/86] xen-netback: protect resource cleaning on  XenBus disconnect "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 07/86] net: phy: use boolean dt properties for  eee broken modes "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 04/86] net: phy: add an option to disable EEE  advertisement "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 08/86] dt: bindings: net: use boolean dt  properties for eee broken modes "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 13/86] ubifs: allow encryption ioctls in compat  mode "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
    Re: [PATCH for v4.9 LTS 13/86] ubifs: allow encryption ioctls in  compat mode Eric Biggers <ebiggers@google.com> - 2017-06-19 19:10 +0200
      Re: [PATCH for v4.9 LTS 13/86] ubifs: allow encryption ioctls in  compat mode Richard Weinberger <richard@nod.at> - 2017-06-19 21:30 +0200
        Re: [PATCH for v4.9 LTS 13/86] ubifs: allow encryption ioctls in  compat mode "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-19 21:50 +0200
          Re: [PATCH for v4.9 LTS 13/86] ubifs: allow encryption ioctls in  compat mode Richard Weinberger <richard@nod.at> - 2017-06-19 22:10 +0200
  [PATCH for v4.9 LTS 25/86] xen-netback: fix memory leaks on XenBus  disconnect "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 11/86] ARM64: dts: meson-gxbb-odroidc2: fix GbE  tx link breakage "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 27/86] bnxt_en: Fix "uninitialized variable" bug  in TPA code path. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 02/86] sparc64: Zero pages on allocation for  mondo and error queues. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 31/86] Btrfs: Fix deadlock between direct IO and  fast fsync "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 19/86] qla2xxx: Fix erroneous invalid handle  message "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 06/86] net: phy: fix sign type error in  genphy_config_eee_advert "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 15/86] scsi: sd: Fix wrong DPOFUA disable in  sd_read_cache_type "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 16/86] stmmac: add missing of_node_put "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 05/86] dt-bindings: net: add EEE capability  constants "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 18/86] qla2xxx: Terminate exchange if corrupted "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 12/86] perf/x86/intel: Handle exclusive threadid  correctly on CPU hotplug "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200
  [PATCH for v4.9 LTS 28/86] bpf: don't trigger OOM killer under  pressure with map alloc "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-06-18 00:50 +0200

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