- 25 May, 2017 40 commits
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James Hogan authored
commit 8a8b5663 upstream. The __user_bad() macro used by access_ok() has a few corner cases noticed by Al Viro where it doesn't behave correctly: - The kernel range check has off by 1 errors which permit access to the first and last byte of the kernel mapped range. - The kernel range check ends at LINCORE_BASE rather than META_MEMORY_LIMIT, which is ineffective when the kernel is in global space (an extremely uncommon configuration). There are a couple of other shortcomings here too: - Access to the whole of the other address space is permitted (i.e. the global half of the address space when the kernel is in local space). This isn't ideal as it could theoretically still contain privileged mappings set up by the bootloader. - The size argument is unused, permitting user copies which start on valid pages at the end of the user address range and cross the boundary into the kernel address space (e.g. addr = 0x3ffffff0, size > 0x10). It isn't very convenient to add size checks when disallowing certain regions, and it seems far safer to be sure and explicit about what userland is able to access, so invert the logic to allow certain regions instead, and fix the off by 1 errors and missing size checks. This also allows the get_fs() == KERNEL_DS check to be more easily optimised into the user address range case. We now have 3 such allowed regions: - The user address range (incorporating the get_fs() == KERNEL_DS check). - NULL (some kernel code expects this to work, and we'll always catch the fault anyway). - The core code memory region. Fixes: 373cd784 ("metag: Memory handling") Reported-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
James Hogan <james.hogan@imgtec.com> Cc: linux-metag@vger.kernel.org Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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KarimAllah Ahmed authored
commit f73a7eee upstream. Ever since commit 091d42e4 ("iommu/vt-d: Copy translation tables from old kernel") the kdump kernel copies the IOMMU context tables from the previous kernel. Each device mappings will be destroyed once the driver for the respective device takes over. This unfortunately breaks the workflow of mapping and unmapping a new context to the IOMMU. The mapping function assumes that either: 1) Unmapping did the proper IOMMU flushing and it only ever flush if the IOMMU unit supports caching invalid entries. 2) The system just booted and the initialization code took care of flushing all IOMMU caches. This assumption is not true for the kdump kernel since the context tables have been copied from the previous kernel and translations could have been cached ever since. So make sure to flush the IOTLB as well when we destroy these old copied mappings. Cc: Joerg Roedel <joro@8bytes.org> Cc: David Woodhouse <dwmw2@infradead.org> Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: Anthony Liguori <aliguori@amazon.com> Signed-off-by:
KarimAllah Ahmed <karahmed@amazon.de> Acked-by:
David Woodhouse <dwmw@amazon.co.uk> Fixes: 091d42e4 ("iommu/vt-d: Copy translation tables from old kernel") Signed-off-by:
Joerg Roedel <jroedel@suse.de> Signed-off-by:
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Malcolm Priestley authored
commit 95d93e27 upstream. TID 7 is a valid value for QoS IEEE 802.11e. The switch statement that follows states 7 is valid. Remove function IsACValid and use the default case to filter invalid TIDs. Signed-off-by:
Malcolm Priestley <tvboxspy@gmail.com> Signed-off-by:
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Malcolm Priestley authored
commit 90be652c upstream. EPROM_CMD is 2 byte aligned on PCI map so calling with rtl92e_readl will return invalid data so use rtl92e_readw. The device is unable to select the right eeprom type. Signed-off-by:
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Malcolm Priestley authored
commit 867510bd upstream. BSSIDR has two byte alignment on PCI ioremap correct the write by swapping to 16 bits first. This fixes a problem that the device associates fail because the filter is not set correctly. Signed-off-by:
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Malcolm Priestley authored
commit baabd567 upstream. The driver attempts to alter memory that is mapped to PCI device. This is because tx_fwinfo_8190pci points to skb->data Move the pci_map_single to when completed buffer is ready to be mapped with psdec is empty to drop on mapping error. Signed-off-by:
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Kristina Martsenko authored
commit f0e421b1 upstream. Some kernel features don't currently work if a task puts a non-zero address tag in its stack pointer, frame pointer, or frame record entries (FP, LR). For example, with a tagged stack pointer, the kernel can't deliver signals to the process, and the task is killed instead. As another example, with a tagged frame pointer or frame records, perf fails to generate call graphs or resolve symbols. For now, just document these limitations, instead of finding and fixing everything that doesn't work, as it's not known if anyone needs to use tags in these places anyway. In addition, as requested by Dave Martin, generalize the limitations into a general kernel address tag policy, and refactor tagged-pointers.txt to include it. Fixes: d50240a5 ("arm64: mm: permit use of tagged pointers at EL0") Reviewed-by:
Dave Martin <Dave.Martin@arm.com> Acked-by:
Will Deacon <will.deacon@arm.com> Signed-off-by:
Kristina Martsenko <kristina.martsenko@arm.com> Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
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Mark Rutland authored
commit a06040d7 upstream. Our access_ok() simply hands its arguments over to __range_ok(), which implicitly assummes that the addr parameter is 64 bits wide. This isn't necessarily true for compat code, which might pass down a 32-bit address parameter. In these cases, we don't have a guarantee that the address has been zero extended to 64 bits, and the upper bits of the register may contain unknown values, potentially resulting in a suprious failure. Avoid this by explicitly casting the addr parameter to an unsigned long (as is done on other architectures), ensuring that the parameter is widened appropriately. Fixes: 0aea86a2 ("arm64: User access library functions") Acked-by:
Mark Rutland <mark.rutland@arm.com> Signed-off-by:
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Mark Rutland authored
commit 55de49f9 upstream. Our compat swp emulation holds the compat user address in an unsigned int, which it passes to __user_swpX_asm(). When a 32-bit value is passed in a register, the upper 32 bits of the register are unknown, and we must extend the value to 64 bits before we can use it as a base address. This patch casts the address to unsigned long to ensure it has been suitably extended, avoiding the potential issue, and silencing a related warning from clang. Fixes: bd35a4ad ("arm64: Port SWP/SWPB emulation support from arm") Acked-by:
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Mark Rutland authored
commit 994870be upstream. When an inline assembly operand's type is narrower than the register it is allocated to, the least significant bits of the register (up to the operand type's width) are valid, and any other bits are permitted to contain any arbitrary value. This aligns with the AAPCS64 parameter passing rules. Our __smp_store_release() implementation does not account for this, and implicitly assumes that operands have been zero-extended to the width of the type being stored to. Thus, we may store unknown values to memory when the value type is narrower than the pointer type (e.g. when storing a char to a long). This patch fixes the issue by casting the value operand to the same width as the pointer operand in all cases, which ensures that the value is zero-extended as we expect. We use the same union trickery as __smp_load_acquire and {READ,WRITE}_ONCE() to avoid GCC complaining that pointers are potentially cast to narrower width integers in unreachable paths. A whitespace issue at the top of __smp_store_release() is also corrected. No changes are necessary for __smp_load_acquire(). Load instructions implicitly clear any upper bits of the register, and the compiler will only consider the least significant bits of the register as valid regardless. Fixes: 47933ad4 ("arch: Introduce smp_load_acquire(), smp_store_release()") Fixes: 878a84d5 ("arm64: add missing data types in smp_load_acquire/smp_store_release") Acked-by:
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Mark Rutland authored
commit fee960be upstream. The inline assembly in __XCHG_CASE() uses a +Q constraint to hazard against other accesses to the memory location being exchanged. However, the pointer passed to the constraint is a u8 pointer, and thus the hazard only applies to the first byte of the location. GCC can take advantage of this, assuming that other portions of the location are unchanged, as demonstrated with the following test case: union u { unsigned long l; unsigned int i[2]; }; unsigned long update_char_hazard(union u *u) { unsigned int a, b; a = u->i[1]; asm ("str %1, %0" : "+Q" (*(char *)&u->l) : "r" (0UL)); b = u->i[1]; return a ^ b; } unsigned long update_long_hazard(union u *u) { unsigned int a, b; a = u->i[1]; asm ("str %1, %0" : "+Q" (*(long *)&u->l) : "r" (0UL)); b = u->i[1]; return a ^ b; } The linaro 15.08 GCC 5.1.1 toolchain compiles the above as follows when using -O2 or above: 0000000000000000 <update_char_hazard>: 0: d2800001 mov x1, #0x0 // #0 4: f9000001 str x1, [x0] 8: d2800000 mov x0, #0x0 // #0 c: d65f03c0 ret 0000000000000010 <update_long_hazard>: 10: b9400401 ldr w1, [x0,#4] 14: d2800002 mov x2, #0x0 // #0 18: f9000002 str x2, [x0] 1c: b9400400 ldr w0, [x0,#4] 20: 4a000020 eor w0, w1, w0 24: d65f03c0 ret This patch fixes the issue by passing an unsigned long pointer into the +Q constraint, as we do for our cmpxchg code. This may hazard against more than is necessary, but this is better than missing a necessary hazard. Fixes: 305d454a ("arm64: atomics: implement native {relaxed, acquire, release} atomics") Acked-by:
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Daniel Lezcano authored
commit 0fbdf995 upstream. The MMC hosts could be left in an unconsistent or uninitialized state from the firmware. Instead of assuming, the firmware did the right things, let's reset the host controllers. This change fixes a bug when the mmc2/sdio is initialized leading to a hung task: [ 242.704294] INFO: task kworker/7:1:675 blocked for more than 120 seconds. [ 242.711129] Not tainted 4.9.0-rc8-00017-gcf0251f #3 [ 242.716571] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.724435] kworker/7:1 D 0 675 2 0x00000000 [ 242.729973] Workqueue: events_freezable mmc_rescan [ 242.734796] Call trace: [ 242.737269] [<ffff00000808611c>] __switch_to+0xa8/0xb4 [ 242.742437] [<ffff000008d07c04>] __schedule+0x1c0/0x67c [ 242.747689] [<ffff000008d08254>] schedule+0x40/0xa0 [ 242.752594] [<ffff000008d0b284>] schedule_timeout+0x1c4/0x35c [ 242.758366] [<ffff000008d08e38>] wait_for_common+0xd0/0x15c [ 242.763964] [<ffff000008d09008>] wait_for_completion+0x28/0x34 [ 242.769825] [<ffff000008a1a9f4>] mmc_wait_for_req_done+0x40/0x124 [ 242.775949] [<ffff000008a1ab98>] mmc_wait_for_req+0xc0/0xf8 [ 242.781549] [<ffff000008a1ac3c>] mmc_wait_for_cmd+0x6c/0x84 [ 242.787149] [<ffff000008a26610>] mmc_io_rw_direct_host+0x9c/0x114 [ 242.793270] [<ffff000008a26aa0>] sdio_reset+0x34/0x7c [ 242.798347] [<ffff000008a1d46c>] mmc_rescan+0x2fc/0x360 [ ... ] Signed-off-by:
Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by:
Wei Xu <xuwei5@hisilicon.com> Signed-off-by:
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Leonard Crestez authored
commit d8581c7c upstream. The board file for imx6sx-sdb overrides cpufreq operating points to use higher voltages. This is done because the board has a shared rail for VDD_ARM_IN and VDD_SOC_IN and when using LDO bypass the shared voltage needs to be a value suitable for both ARM and SOC. This only applies to LDO bypass mode, a feature not present in upstream. When LDOs are enabled the effect is to use higher voltages than necessary for no good reason. Setting these higher voltages can make some boards fail to boot with ugly semi-random crashes reminiscent of memory corruption. These failures only happen on board rev. C, rev. B is reported to still work. Signed-off-by:
Leonard Crestez <leonard.crestez@nxp.com> Fixes: 54183bd7 ("ARM: imx6sx-sdb: add revb board and make it default") Signed-off-by:
Shawn Guo <shawnguo@kernel.org> Signed-off-by:
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Ludovic Desroches authored
commit d3df1ec0 upstream. Remove ADC channels that are not available by default on the sama5d3_xplained board (resistor not populated) in order to not create confusion. Signed-off-by:
Ludovic Desroches <ludovic.desroches@microchip.com> Acked-by:
Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by:
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Ludovic Desroches authored
commit 9cdd31e5 upstream. The voltage reference for the ADC is not 3V but 3.3V since it is connected to VDDANA. Signed-off-by:
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Vladimir Murzin authored
commit 6d805949 upstream. We save/restore registers around v7m_invalidate_l1 to address pointed by r12, which is vector table, so the first eight entries are overwritten with a garbage. We already have stack setup at that stage, so use it to save/restore register. Fixes: 6a8146f4 ("ARM: 8609/1: V7M: Add support for the Cortex-M7 processor") Signed-off-by:
Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by:
Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by:
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Ard Biesheuvel authored
commit b7ede5a1 upstream. Since commit 35fa91ee ("ARM: kernel: merge core and init PLTs"), the ARM module PLT code allocates all PLT entries in a single core section, since the overhead of having a separate init PLT section is not justified by the small number of PLT entries usually required for init code. However, the core and init module regions are allocated independently, and there is a corner case where the core region may be allocated from the VMALLOC region if the dedicated module region is exhausted, but the init region, being much smaller, can still be allocated from the module region. This puts the PLT entries out of reach of the relocated branch instructions, defeating the whole purpose of PLTs. So split the core and init PLT regions, and name the latter ".init.plt" so it gets allocated along with (and sufficiently close to) the .init sections that it serves. Also, given that init PLT entries may need to be emitted for branches that target the core module, modify the logic that disregards defined symbols to only disregard symbols that are defined in the same section. Fixes: 35fa91ee ("ARM: kernel: merge core and init PLTs") Reported-by:
Angus Clark <angus@angusclark.org> Tested-by:
Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by:
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Zhichao Huang authored
commit 661e6b02 upstream. Hardware debugging in guests is not intercepted currently, it means that a malicious guest can bring down the entire machine by writing to the debug registers. This patch enable trapping of all debug registers, preventing the guests to access the debug registers. This includes access to the debug mode(DBGDSCR) in the guest world all the time which could otherwise mess with the host state. Reads return 0 and writes are ignored (RAZ_WI). The result is the guest cannot detect any working hardware based debug support. As debug exceptions are still routed to the guest normal debug using software based breakpoints still works. To support debugging using hardware registers we need to implement a debug register aware world switch as well as special trapping for registers that may affect the host state. Signed-off-by:
Zhichao Huang <zhichao.huang@linaro.org> Signed-off-by:
Alex Bennée <alex.bennee@linaro.org> Reviewed-by:
Christoffer Dall <cdall@linaro.org> Signed-off-by:
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Marc Zyngier authored
commit 501ad27c upstream. We like living dangerously. Nothing explicitely forbids stack-protector to be used in the HYP code, while distributions routinely compile their kernel with it. We're just lucky that no code actually triggers the instrumentation. Let's not try our luck for much longer, and disable stack-protector for code living at HYP. Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com> Acked-by:
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Marc Zyngier authored
commit cde13b5d upstream. We like living dangerously. Nothing explicitely forbids stack-protector to be used in the EL2 code, while distributions routinely compile their kernel with it. We're just lucky that no code actually triggers the instrumentation. Let's not try our luck for much longer, and disable stack-protector for code living at EL2. Signed-off-by:
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Michael Neuling authored
commit f48e91e8 upstream. In commit dc310669 ("powerpc: tm: Always use fp_state and vr_state to store live registers"), a section of code was removed that copied the current state to checkpointed state. That code should not have been removed. When an FP (Floating Point) unavailable is taken inside a transaction, we need to abort the transaction. This is because at the time of the tbegin, the FP state is bogus so the state stored in the checkpointed registers is incorrect. To fix this, we treclaim (to get the checkpointed GPRs) and then copy the thread_struct FP live state into the checkpointed state. We then trecheckpoint so that the FP state is correctly restored into the CPU. The copying of the FP registers from live to checkpointed is what was missing. This simplifies the logic slightly from the original patch. tm_reclaim_thread() will now always write the checkpointed FP state. Either the checkpointed FP state will be written as part of the actual treclaim (in tm.S), or it'll be a copy of the live state. Which one we use is based on MSR[FP] from userspace. Similarly for VMX. Fixes: dc310669 ("powerpc: tm: Always use fp_state and vr_state to store live registers") Signed-off-by:
Michael Neuling <mikey@neuling.org> Reviewed-by: cyrilbur@gmail.com Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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LiuHailong authored
commit fd615f69 upstream. Debug interrupts can be taken during interrupt entry, since interrupt entry does not automatically turn them off. The kernel will check whether the faulting instruction is between [interrupt_base_book3e, __end_interrupts], and if so clear MSR[DE] and return. However, when the kernel is built with CONFIG_RELOCATABLE, it can't use LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e) and LOAD_REG_IMMEDIATE(r15,__end_interrupts), as they ignore relocation. Thus, if the kernel is actually running at a different address than it was built at, the address comparison will fail, and the exception entry code will hang at kernel_dbg_exc. r2(toc) is also not usable here, as r2 still holds data from the interrupted context, so LOAD_REG_ADDR() doesn't work either. So we use the *name@got* to get the EV of two labels directly. Test programs test.c shows as follows: int main(int argc, char *argv[]) { if (access("/proc/sys/kernel/perf_event_paranoid", F_OK) == -1) printf("Kernel doesn't have perf_event support\n"); } Steps to reproduce the bug, for example: 1) ./gdb ./test 2) (gdb) b access 3) (gdb) r 4) (gdb) s Signed-off-by:
Liu Hailong <liu.hailong6@zte.com.cn> Signed-off-by:
Jiang Xuexin <jiang.xuexin@zte.com.cn> Reviewed-by:
Jiang Biao <jiang.biao2@zte.com.cn> Reviewed-by:
Liu Song <liu.song11@zte.com.cn> Reviewed-by:
Huang Jian <huang.jian@zte.com.cn> [scottwood: cleaned up commit message, and specified bad behavior as a hang rather than an oops to correspond to mainline kernel behavior] Fixes: 1cb6e064 ("powerpc/book3e: support CONFIG_RELOCATABLE") Signed-off-by:
Scott Wood <oss@buserror.net> Signed-off-by:
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Alexey Kardashevskiy authored
commit e889e96e upstream. The CMA pages migration code does not support compound pages at the moment so it performs few tests before proceeding to actual page migration. One of the tests - PageTransHuge() - has VM_BUG_ON_PAGE(PageTail()) as it is designed to be called on head pages only. Since we also test for PageCompound(), and it contains PageTail() and PageHead(), we can simplify the check by leaving just PageCompound() and therefore avoid possible VM_BUG_ON_PAGE. Fixes: 2e5bbb54 ("KVM: PPC: Book3S HV: Migrate pinned pages out of CMA") Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by:
Balbir Singh <bsingharora@gmail.com> Signed-off-by:
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Tyrel Datwyler authored
commit 68baf692 upstream. Historically struct device_node references were tracked using a kref embedded as a struct field. Commit 75b57ecf ("of: Make device nodes kobjects so they show up in sysfs") (Mar 2014) refactored device_nodes to be kobjects such that the device tree could by more simply exposed to userspace using sysfs. Commit 0829f6d1 ("of: device_node kobject lifecycle fixes") (Mar 2014) followed up these changes to better control the kobject lifecycle and in particular the referecne counting via of_node_get(), of_node_put(), and of_node_init(). A result of this second commit was that it introduced an of_node_put() call when a dynamic node is detached, in of_node_remove(), that removes the initial kobj reference created by of_node_init(). Traditionally as the original dynamic device node user the pseries code had assumed responsibilty for releasing this final reference in its platform specific DLPAR detach code. This patch fixes a refcount underflow introduced by commit 0829f6d1, and recently exposed by the upstreaming of the recount API. Messages like the following are no longer seen in the kernel log with this patch following DLPAR remove operations of cpus and pci devices. rpadlpar_io: slot PHB 72 removed refcount_t: underflow; use-after-free. ------------[ cut here ]------------ WARNING: CPU: 5 PID: 3335 at lib/refcount.c:128 refcount_sub_and_test+0xf4/0x110 Fixes: 0829f6d1 ("of: device_node kobject lifecycle fixes") Signed-off-by:
Tyrel Datwyler <tyreld@linux.vnet.ibm.com> [mpe: Make change log commit references more verbose] Signed-off-by:
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Mahesh Salgaonkar authored
commit d93b0ac0 upstream. machine_check_early() gets called in real mode. The very first time when add_taint() is called, it prints a warning which ends up calling opal call (that uses OPAL_CALL wrapper) for writing it to console. If we get a very first machine check while we are in opal we are doomed. OPAL_CALL overwrites the PACASAVEDMSR in r13 and in this case when we are done with MCE handling the original opal call will use this new MSR on it's way back to opal_return. This usually leads to unexpected behaviour or the kernel to panic. Instead move the add_taint() call later in the virtual mode where it is safe to call. This is broken with current FW level. We got lucky so far for not getting very first MCE hit while in OPAL. But easily reproducible on Mambo. Fixes: 27ea2c42 ("powerpc: Set the correct kernel taint on machine check errors.") Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by:
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Russell Currey authored
commit daeba295 upstream. eeh_handle_special_event() is called when an EEH event is detected but can't be narrowed down to a specific PE. This function looks through every PE to find one in an erroneous state, then calls the regular event handler eeh_handle_normal_event() once it knows which PE has an error. However, if eeh_handle_normal_event() found that the PE cannot possibly be recovered, it will free it, rendering the passed PE stale. This leads to a use after free in eeh_handle_special_event() as it attempts to clear the "recovering" state on the PE after eeh_handle_normal_event() returns. Thus, make sure the PE is valid when attempting to clear state in eeh_handle_special_event(). Fixes: 8a6b1bc7 ("powerpc/eeh: EEH core to handle special event") Reported-by:
Russell Currey <ruscur@russell.cc> Reviewed-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by:
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David Gibson authored
commit 9765ad13 upstream. powerpc expects IRQs to already be (soft) disabled when switch_mm() is called, as made clear in the commit message of 9c1e1052 ("powerpc: Allow perf_counters to access user memory at interrupt time"). Aside from any race conditions that might exist between switch_mm() and an IRQ, there is also an unconditional hard_irq_disable() in switch_slb(). If that isn't followed at some point by an IRQ enable then interrupts will remain disabled until we return to userspace. It is true that when switch_mm() is called from the scheduler IRQs are off, but not when it's called by use_mm(). Looking closer we see that last year in commit f98db601 ("sched/core: Add switch_mm_irqs_off() and use it in the scheduler") this was made more explicit by the addition of switch_mm_irqs_off() which is now called by the scheduler, vs switch_mm() which is used by use_mm(). Arguably it is a bug in use_mm() to call switch_mm() in a different context than it expects, but fixing that will take time. This was discovered recently when vhost started throwing warnings such as: BUG: sleeping function called from invalid context at kernel/mutex.c:578 in_atomic(): 0, irqs_disabled(): 1, pid: 10768, name: vhost-10760 no locks held by vhost-10760/10768. irq event stamp: 10 hardirqs last enabled at (9): _raw_spin_unlock_irq+0x40/0x80 hardirqs last disabled at (10): switch_slb+0x2e4/0x490 softirqs last enabled at (0): copy_process+0x5e8/0x1260 softirqs last disabled at (0): (null) Call Trace: show_stack+0x88/0x390 (unreliable) dump_stack+0x30/0x44 __might_sleep+0x1c4/0x2d0 mutex_lock_nested+0x74/0x5c0 cgroup_attach_task_all+0x5c/0x180 vhost_attach_cgroups_work+0x58/0x80 [vhost] vhost_worker+0x24c/0x3d0 [vhost] kthread+0xec/0x100 ret_from_kernel_thread+0x5c/0xd4 Prior to commit 04b96e55 ("vhost: lockless enqueuing") (Aug 2016) the vhost_worker() would do a spin_unlock_irq() not long after calling use_mm(), which had the effect of reenabling IRQs. Since that commit removed the locking in vhost_worker() the body of the vhost_worker() loop now runs with interrupts off causing the warnings. This patch addresses the problem by making the powerpc code mirror the x86 code, ie. we disable interrupts in switch_mm(), and optimise the scheduler case by defining switch_mm_irqs_off(). Signed-off-by:
David Gibson <david@gibson.dropbear.id.au> [mpe: Flesh out/rewrite change log, add stable] Signed-off-by:
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Johan Hovold authored
commit 0cd273bb upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer or accessing memory beyond the endpoint array should a malicious device lack the expected endpoints. Fixes: e0d3bafd ("V4L/DVB (10954): Add cx231xx USB driver") Cc: Sri Deevi <Srinivasa.Deevi@conexant.com> Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by:
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Johan Hovold authored
commit 65f92164 upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer or accessing memory beyond the endpoint array should a malicious device lack the expected endpoints. Fixes: e0d3bafd ("V4L/DVB (10954): Add cx231xx USB driver") Cc: Sri Deevi <Srinivasa.Deevi@conexant.com> Signed-off-by:
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Johan Hovold authored
commit fff1abc4 upstream. Make sure to release the snd_card also on a late allocation error. Fixes: e0d3bafd ("V4L/DVB (10954): Add cx231xx USB driver") Cc: Sri Deevi <Srinivasa.Deevi@conexant.com> Signed-off-by:
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Alyssa Milburn authored
commit 950e252c upstream. Otherwise the i2c transfer functions can read or write beyond the end of stack or heap buffers. Signed-off-by:
Alyssa Milburn <amilburn@zall.org> Signed-off-by:
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Alyssa Milburn authored
commit 821117dc upstream. Return an error rather than memcpy()ing beyond the end of the buffer. Internal callers use appropriate sizes, but digitv_i2c_xfer may not. Signed-off-by:
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Daniel Scheller authored
commit 158f0328 upstream. Fixes "w_scan -f c" complaining with This dvb driver is *buggy*: the symbol rate limits are undefined - please report to linuxtv.org) Signed-off-by:
Daniel Scheller <d.scheller@gmx.net> Acked-by:
Abylay Ospan <aospan@netup.ru> Signed-off-by:
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Alyssa Milburn authored
commit ee0fe833 upstream. This code copies actual_length-128 bytes from the header, which will underflow if the received buffer is too small. Signed-off-by:
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Johan Hovold authored
commit d5823511 upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Fixes: c4018fa2 ("[media] dib0700: fix RC support on Hauppauge Nova-TD") Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by:
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Marek Szyprowski authored
commit a5cb00eb upstream. Clock should be turned off after calling s5p_mfc_init_hw() from the watchdog worker, like it is already done in the s5p_mfc_open() which also calls this function. Fixes: af935746 ("[media] MFC: Add MFC 5.1 V4L2 driver") Signed-off-by:
Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by:
Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by:
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Johan Hovold authored
commit aa58fedb upstream. Make sure to check the number of endpoints to avoid accessing memory beyond the endpoint array should a device lack the expected endpoints. Note that, as far as I can tell, the gspca framework has already made sure there is at least one endpoint in the current alternate setting so there should be no risk for a NULL-pointer dereference here. Fixes: b517af72 ("V4L/DVB: gspca_konica: New gspca subdriver for konica chipset using cams") Cc: Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Hans Verkuil <hansverk@cisco.com> Signed-off-by:
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Marek Szyprowski authored
commit 0c32b8ec upstream. Interrupt routine must wake process waiting for given interrupt AFTER updating driver's internal structures and contexts. Doing it in-between is a serious bug. This patch moves all calls to the wake() function to the end of the interrupt processing block to avoid potential and real races, especially on multi-core platforms. This also fixes following issue reported from clock core (clocks were disabled in interrupt after being unprepared from the other place in the driver, the stack trace however points to the different place than s5p_mfc driver because of the race): WARNING: CPU: 1 PID: 18 at drivers/clk/clk.c:544 clk_core_unprepare+0xc8/0x108 Modules linked in: CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.10.0-next-20170223-00070-g04e18bc99ab9-dirty #2154 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) Workqueue: pm pm_runtime_work [<c010d8b0>] (unwind_backtrace) from [<c010a534>] (show_stack+0x10/0x14) [<c010a534>] (show_stack) from [<c033292c>] (dump_stack+0x74/0x94) [<c033292c>] (dump_stack) from [<c011cef4>] (__warn+0xd4/0x100) [<c011cef4>] (__warn) from [<c011cf40>] (warn_slowpath_null+0x20/0x28) [<c011cf40>] (warn_slowpath_null) from [<c0387a84>] (clk_core_unprepare+0xc8/0x108) [<c0387a84>] (clk_core_unprepare) from [<c0389d84>] (clk_unprepare+0x24/0x2c) [<c0389d84>] (clk_unprepare) from [<c03d4660>] (exynos_sysmmu_suspend+0x48/0x60) [<c03d4660>] (exynos_sysmmu_suspend) from [<c042b9b0>] (pm_generic_runtime_suspend+0x2c/0x38) [<c042b9b0>] (pm_generic_runtime_suspend) from [<c0437580>] (genpd_runtime_suspend+0x94/0x220) [<c0437580>] (genpd_runtime_suspend) from [<c042e240>] (__rpm_callback+0x134/0x208) [<c042e240>] (__rpm_callback) from [<c042e334>] (rpm_callback+0x20/0x80) [<c042e334>] (rpm_callback) from [<c042d3b8>] (rpm_suspend+0xdc/0x458) [<c042d3b8>] (rpm_suspend) from [<c042ea24>] (pm_runtime_work+0x80/0x90) [<c042ea24>] (pm_runtime_work) from [<c01322c4>] (process_one_work+0x120/0x318) [<c01322c4>] (process_one_work) from [<c0132520>] (worker_thread+0x2c/0x4ac) [<c0132520>] (worker_thread) from [<c0137ab0>] (kthread+0xfc/0x134) [<c0137ab0>] (kthread) from [<c0107978>] (ret_from_fork+0x14/0x3c) ---[ end trace 1ead49a7bb83f0d8 ]--- Fixes: af935746 ("[media] MFC: Add MFC 5.1 V4L2 driver") Signed-off-by:
Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by:
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Srinivas Pandruvada authored
commit 5d9854ea upstream. This change undo the change done by 'commit 3bec2474 ("iio: hid-sensor-trigger: Change get poll value function order to avoid sensor properties losing after resume from S3")' as this breaks some USB/i2c sensor hubs. Instead of relying on HW for restoring poll and hysteresis, driver stores and restores on resume (S3). In this way user space modified settings are not lost for any kind of sensor hub behavior. In this change, whenever user space modifies sampling frequency or hysteresis driver will get the feature value from the hub and store in the per device hid_sensor_common data structure. On resume callback from S3, system will set the feature to sensor hub, if user space ever modified the feature value. Fixes: 3bec2474 ("iio: hid-sensor-trigger: Change get poll value function order to avoid sensor properties losing after resume from S3") Reported-by:
Ritesh Raj Sarraf <rrs@researchut.com> Tested-by:
Song, Hongyan <hongyan.song@intel.com> Signed-off-by:
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
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Matt Ranostay authored
commit 84ca8e36 upstream. AS3935_WRITE_DATA macro bit is incorrect and the actual write sequence is two leading zeros. Cc: George McCollister <george.mccollister@gmail.com> Signed-off-by:
Matt Ranostay <matt.ranostay@konsulko.com> Signed-off-by:
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