- 01 Feb, 2016 4 commits
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Antonio Ospite authored
[ Upstream commit dcc7fdbe ] v4l2-compliance sends a zeroed struct v4l2_streamparm in v4l2-test-formats.cpp::testParmType(), and this results in a division by 0 in some gspca subdrivers: divide error: 0000 [#1] SMP Modules linked in: gspca_ov534 gspca_main ... CPU: 0 PID: 17201 Comm: v4l2-compliance Not tainted 4.3.0-rc2-ao2 #1 Hardware name: System manufacturer System Product Name/M2N-E SLI, BIOS ASUS M2N-E SLI ACPI BIOS Revision 1301 09/16/2010 task: ffff8800818306c0 ti: ffff880095c4c000 task.ti: ffff880095c4c000 RIP: 0010:[<ffffffffa079bd62>] [<ffffffffa079bd62>] sd_set_streamparm+0x12/0x60 [gspca_ov534] RSP: 0018:ffff880095c4fce8 EFLAGS: 00010296 RAX: 0000000000000000 RBX: ffff8800c9522000 RCX: ffffffffa077a140 RDX: 0000000000000000 RSI: ffff880095e0c100 RDI: ffff8800c9522000 RBP: ffff880095e0c100 R08: ffffffffa077a100 R09: 00000000000000cc R10: ffff880067ec7740 R11: 0000000000000016 R12: ffffffffa07bb400 R13: 0000000000000000 R14: ffff880081b6a800 R15: 0000000000000000 FS: 00007fda0de78740(0000) GS:ffff88012fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000014630f8 CR3: 00000000cf349000 CR4: 00000000000006f0 Stack: ffffffffa07a6431 ffff8800c9522000 ffffffffa077656e 00000000c0cc5616 ffff8800c9522000 ffffffffa07a5e20 ffff880095e0c100 0000000000000000 ffff880067ec7740 ffffffffa077a140 ffff880067ec7740 0000000000000016 Call Trace: [<ffffffffa07a6431>] ? v4l_s_parm+0x21/0x50 [videodev] [<ffffffffa077656e>] ? vidioc_s_parm+0x4e/0x60 [gspca_main] [<ffffffffa07a5e20>] ? __video_do_ioctl+0x280/0x2f0 [videodev] [<ffffffffa07a5ba0>] ? video_ioctl2+0x20/0x20 [videodev] [<ffffffffa07a59b9>] ? video_usercopy+0x319/0x4e0 [videodev] [<ffffffff81182dc1>] ? page_add_new_anon_rmap+0x71/0xa0 [<ffffffff811afb92>] ? mem_cgroup_commit_charge+0x52/0x90 [<ffffffff81179b18>] ? handle_mm_fault+0xc18/0x1680 [<ffffffffa07a15cc>] ? v4l2_ioctl+0xac/0xd0 [videodev] [<ffffffff811c846f>] ? do_vfs_ioctl+0x28f/0x480 [<ffffffff811c86d4>] ? SyS_ioctl+0x74/0x80 [<ffffffff8154a8b6>] ? entry_SYSCALL_64_fastpath+0x16/0x75 Code: c7 93 d9 79 a0 5b 5d e9 f1 f3 9a e0 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 53 31 d2 48 89 fb 48 83 ec 08 8b 46 10 <f7> 76 0c 80 bf ac 0c 00 00 00 88 87 4e 0e 00 00 74 09 80 bf 4f RIP [<ffffffffa079bd62>] sd_set_streamparm+0x12/0x60 [gspca_ov534] RSP <ffff880095c4fce8> ---[ end trace 279710c2c6c72080 ]--- Following what the doc says about a zeroed timeperframe (see http://www.linuxtv.org/downloads/v4l-dvb-apis/vidioc-g-parm.html): ... To reset manually applications can just set this field to zero. fix the issue by resetting the frame rate to a default value in case of an unusable timeperframe. The fix is done in the subdrivers instead of gspca.c because only the subdrivers have notion of a default frame rate to reset the camera to. Signed-off-by:
Antonio Ospite <ao2@ao2.it> Cc: stable@vger.kernel.org Reviewed-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by:
Sasha Levin <sasha.levin@oracle.com>
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Sasha Levin authored
[ Upstream commit 4623e596 ] In the 3.17 kernel the poll() behavior changed for output streams: as long as not all buffers were queued up poll() would return that userspace can write. This is fine for the write() call, but when using stream I/O this changed the behavior since the expectation was that it would wait for buffers to become available for dequeuing. This patch only enables the check whether you can queue buffers for file I/O only, and skips it for stream I/O. Signed-off-by:
Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: <stable@vger.kernel.org> # for v3.17 and up Signed-off-by:
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Vito Caputo authored
[ Upstream commit e4ad29fa ] Rather than always allocating the high-order XATTR_SIZE_MAX buffer which is costly and prone to failure, only allocate what is needed and realloc if necessary. Fixes https://github.com/coreos/bugs/issues/489Signed-off-by:
Miklos Szeredi <miklos@szeredi.hu> Cc: <stable@vger.kernel.org> Signed-off-by:
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Miklos Szeredi authored
[ Upstream commit 97daf8b9 ] When ovl_copy_xattr() encountered a zero size xattr no more xattrs were copied and the function returned success. This is clearly not the desired behavior. Signed-off-by:
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- 31 Jan, 2016 36 commits
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Greg Kroah-Hartman authored
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libin authored
commit c84da8b9 upstream. In nop_mcount, shdr->sh_offset and welp->r_offset should handle endianness properly, otherwise it will trigger Segmentation fault if the recordmcount main and file.o have different endianness. Link: http://lkml.kernel.org/r/563806C7.7070606@huawei.comSigned-off-by:
Li Bin <huawei.libin@huawei.com> Signed-off-by:
Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Yang Shi authored
commit 92e788b7 upstream. As previously reported, some userspace applications depend on bogomips showed by /proc/cpuinfo. Although there is much less legacy impact on aarch64 than arm, it does break libvirt. This patch reverts commit 326b16db ("arm64: delay: don't bother reporting bogomips in /proc/cpuinfo"), but with some tweak due to context change and without the pr_info(). Fixes: 326b16db ("arm64: delay: don't bother reporting bogomips in /proc/cpuinfo") Signed-off-by:
Yang Shi <yang.shi@linaro.org> Acked-by:
Will Deacon <will.deacon@arm.com> Cc: <stable@vger.kernel.org> # 3.12+ Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
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Guenter Roeck authored
commit c86576ea upstream. mn10300 builds fail with fs/stat.c: In function 'cp_old_stat': fs/stat.c:163:2: error: 'old_uid_t' undeclared ipc/util.c: In function 'ipc64_perm_to_ipc_perm': ipc/util.c:540:2: error: 'old_uid_t' undeclared Select CONFIG_HAVE_UID16 and remove local definition of CONFIG_UID16 to fix the problem. Fixes: fbc416ff ("arm64: fix building without CONFIG_UID16") Cc: Arnd Bergmann <arnd@arndb.de> Acked-by:
Arnd Bergmann <arnd@arndb.de> Acked-by:
Acked-by: David Howells <dhowells@redhat.com> Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Al Viro authored
commit 2d4594ac upstream. Sure, it's better to bail out of past-the-eof read and return 0 than return a bogus negative value on such. Only we'd better make sure we are bailing out with 0 and not -ENOMEM... Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Jan Kara authored
commit 74cedf9b upstream. Assume a filesystem with 4KB blocks. When a file has size 1000 bytes and we issue direct IO read at offset 1024, blockdev_direct_IO() reads the tail of the last block and the logic for handling short DIO reads in dio_complete() results in a return value -24 (1000 - 1024) which obviously confuses userspace. Fix the problem by bailing out early once we sample i_size and can reliably check that direct IO read starts beyond i_size. Reported-by:
Avi Kivity <avi@scylladb.com> Fixes: 9fe55eea CC: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Salva Peiró authored
commit eda98796 upstream. The vivid_fb_ioctl() code fails to initialize the 16 _reserved bytes of struct fb_vblank after the ->hcount member. Add an explicit memset(0) before filling the structure to avoid the info leak. Signed-off-by:
Salva Peiró <speirofr@gmail.com> Signed-off-by:
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Al Viro authored
commit 9225c0b7 upstream. missing get_user() Signed-off-by:
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Richard Purdie authored
commit 79b568b9 upstream. hid_connect adds various strings to the buffer but they're all conditional. You can find circumstances where nothing would be written to it but the kernel will still print the supposedly empty buffer with printk. This leads to corruption on the console/in the logs. Ensure buf is initialized to an empty string. Signed-off-by:
Richard Purdie <richard.purdie@linuxfoundation.org> [dvhart: Initialize string to "" rather than assign buf[0] = NULL;] Cc: Jiri Kosina <jikos@kernel.org> Cc: linux-input@vger.kernel.org Signed-off-by:
Darren Hart <dvhart@linux.intel.com> Signed-off-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
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Mikulas Patocka authored
commit e46e31a3 upstream. When using the Promise TX2+ SATA controller on PA-RISC, the system often crashes with kernel panic, for example just writing data with the dd utility will make it crash. Kernel panic - not syncing: drivers/parisc/sba_iommu.c: I/O MMU @ 000000000000a000 is out of mapping resources CPU: 0 PID: 18442 Comm: mkspadfs Not tainted 4.4.0-rc2 #2 Backtrace: [<000000004021497c>] show_stack+0x14/0x20 [<0000000040410bf0>] dump_stack+0x88/0x100 [<000000004023978c>] panic+0x124/0x360 [<0000000040452c18>] sba_alloc_range+0x698/0x6a0 [<0000000040453150>] sba_map_sg+0x260/0x5b8 [<000000000c18dbb4>] ata_qc_issue+0x264/0x4a8 [libata] [<000000000c19535c>] ata_scsi_translate+0xe4/0x220 [libata] [<000000000c19a93c>] ata_scsi_queuecmd+0xbc/0x320 [libata] [<0000000040499bbc>] scsi_dispatch_cmd+0xfc/0x130 [<000000004049da34>] scsi_request_fn+0x6e4/0x970 [<00000000403e95a8>] __blk_run_queue+0x40/0x60 [<00000000403e9d8c>] blk_run_queue+0x3c/0x68 [<000000004049a534>] scsi_run_queue+0x2a4/0x360 [<000000004049be68>] scsi_end_request+0x1a8/0x238 [<000000004049de84>] scsi_io_completion+0xfc/0x688 [<0000000040493c74>] scsi_finish_command+0x17c/0x1d0 The cause of the crash is not exhaustion of the IOMMU space, there is plenty of free pages. The function sba_alloc_range is called with size 0x11000, thus the pages_needed variable is 0x11. The function sba_search_bitmap is called with bits_wanted 0x11 and boundary size is 0x10 (because dma_get_seg_boundary(dev) returns 0xffff). The function sba_search_bitmap attempts to allocate 17 pages that must not cross 16-page boundary - it can't satisfy this requirement (iommu_is_span_boundary always returns true) and fails even if there are many free entries in the IOMMU space. How did it happen that we try to allocate 17 pages that don't cross 16-page boundary? The cause is in the function iommu_coalesce_chunks. This function tries to coalesce adjacent entries in the scatterlist. The function does several checks if it may coalesce one entry with the next, one of those checks is this: if (startsg->length + dma_len > max_seg_size) break; When it finishes coalescing adjacent entries, it allocates the mapping: sg_dma_len(contig_sg) = dma_len; dma_len = ALIGN(dma_len + dma_offset, IOVP_SIZE); sg_dma_address(contig_sg) = PIDE_FLAG | (iommu_alloc_range(ioc, dev, dma_len) << IOVP_SHIFT) | dma_offset; It is possible that (startsg->length + dma_len > max_seg_size) is false (we are just near the 0x10000 max_seg_size boundary), so the funcion decides to coalesce this entry with the next entry. When the coalescing succeeds, the function performs dma_len = ALIGN(dma_len + dma_offset, IOVP_SIZE); And now, because of non-zero dma_offset, dma_len is greater than 0x10000. iommu_alloc_range (a pointer to sba_alloc_range) is called and it attempts to allocate 17 pages for a device that must not cross 16-page boundary. To fix the bug, we must make sure that dma_len after addition of dma_offset and alignment doesn't cross the segment boundary. I.e. change if (startsg->length + dma_len > max_seg_size) break; to if (ALIGN(dma_len + dma_offset + startsg->length, IOVP_SIZE) > max_seg_size) break; This patch makes this change (it precalculates max_seg_boundary at the beginning of the function iommu_coalesce_chunks). I also added a check that the mapping length doesn't exceed dma_get_seg_boundary(dev) (it is not needed for Promise TX2+ SATA, but it may be needed for other devices that have dma_get_seg_boundary lower than dma_get_max_seg_size). Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
Helge Deller <deller@gmx.de> Signed-off-by:
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David Woodhouse authored
commit d14053b3 upstream. The VT-d specification says that "Software must enable ATS on endpoint devices behind a Root Port only if the Root Port is reported as supporting ATS transactions." We walk up the tree to find a Root Port, but for integrated devices we don't find one — we get to the host bridge. In that case we *should* allow ATS. Currently we don't, which means that we are incorrectly failing to use ATS for the integrated graphics. Fix that. We should never break out of this loop "naturally" with bus==NULL, since we'll always find bridge==NULL in that case (and now return 1). So remove the check for (!bridge) after the loop, since it can never happen. If it did, it would be worthy of a BUG_ON(!bridge). But since it'll oops anyway in that case, that'll do just as well. Signed-off-by:
David Woodhouse <David.Woodhouse@intel.com> Signed-off-by:
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Will Deacon authored
commit 32d63978 upstream. In paging_init, we allocate the zero page, memset it to zero and then point TTBR0 to it in order to avoid speculative fetches through the identity mapping. In order to guarantee that the freshly zeroed page is indeed visible to the page table walker, we need to execute a dsb instruction prior to writing the TTBR. Signed-off-by:
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John Blackwood authored
commit 5db4fd8c upstream. Make sure to clear out any ptrace singlestep state when a ptrace(2) PTRACE_DETACH call is made on arm64 systems. Otherwise, the previously ptraced task will die off with a SIGTRAP signal if the debugger just previously singlestepped the ptraced task. Signed-off-by:
John Blackwood <john.blackwood@ccur.com> [will: added comment to justify why this is in the arch code] Signed-off-by:
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Ard Biesheuvel authored
commit 0de58f85 upstream. Commit e6fab544 ("ARM/arm64: KVM: test properly for a PTE's uncachedness") modified the logic to test whether a HYP or stage-2 mapping needs flushing, from [incorrectly] interpreting the page table attributes to [incorrectly] checking whether the PFN that backs the mapping is covered by host system RAM. The PFN number is part of the output of the translation, not the input, so we have to use pte_pfn() on the contents of the PTE, not __phys_to_pfn() on the HYP virtual address or stage-2 intermediate physical address. Fixes: e6fab544 ("ARM/arm64: KVM: test properly for a PTE's uncachedness") Tested-by:
Pavel Fedin <p.fedin@samsung.com> Signed-off-by:
Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com> Signed-off-by:
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Arnd Bergmann authored
commit fbc416ff upstream. As reported by Michal Simek, building an ARM64 kernel with CONFIG_UID16 disabled currently fails because the system call table still needs to reference the individual function entry points that are provided by kernel/sys_ni.c in this case, and the declarations are hidden inside of #ifdef CONFIG_UID16: arch/arm64/include/asm/unistd32.h:57:8: error: 'sys_lchown16' undeclared here (not in a function) __SYSCALL(__NR_lchown, sys_lchown16) I believe this problem only exists on ARM64, because older architectures tend to not need declarations when their system call table is built in assembly code, while newer architectures tend to not need UID16 support. ARM64 only uses these system calls for compatibility with 32-bit ARM binaries. This changes the CONFIG_UID16 check into CONFIG_HAVE_UID16, which is set unconditionally on ARM64 with CONFIG_COMPAT, so we see the declarations whenever we need them, but otherwise the behavior is unchanged. Fixes: af1839eb ("Kconfig: clean up the long arch list for the UID16 config option") Signed-off-by:
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Marc Zyngier authored
commit c0f09634 upstream. When running a 32bit guest under a 64bit hypervisor, the ARMv8 architecture defines a mapping of the 32bit registers in the 64bit space. This includes banked registers that are being demultiplexed over the 64bit ones. On exceptions caused by an operation involving a 32bit register, the HW exposes the register number in the ESR_EL2 register. It was so far understood that SW had to distinguish between AArch32 and AArch64 accesses (based on the current AArch32 mode and register number). It turns out that I misinterpreted the ARM ARM, and the clue is in D1.20.1: "For some exceptions, the exception syndrome given in the ESR_ELx identifies one or more register numbers from the issued instruction that generated the exception. Where the exception is taken from an Exception level using AArch32 these register numbers give the AArch64 view of the register." Which means that the HW is already giving us the translated version, and that we shouldn't try to interpret it at all (for example, doing an MMIO operation from the IRQ mode using the LR register leads to very unexpected behaviours). The fix is thus not to perform a call to vcpu_reg32() at all from vcpu_reg(), and use whatever register number is supplied directly. The only case we need to find out about the mapping is when we actively generate a register access, which only occurs when injecting a fault in a guest. Reviewed-by:
Robin Murphy <robin.murphy@arm.com> Signed-off-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
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Ard Biesheuvel authored
commit e6fab544 upstream. The open coded tests for checking whether a PTE maps a page as uncached use a flawed '(pte_val(xxx) & CONST) != CONST' pattern, which is not guaranteed to work since the type of a mapping is not a set of mutually exclusive bits For HYP mappings, the type is an index into the MAIR table (i.e, the index itself does not contain any information whatsoever about the type of the mapping), and for stage-2 mappings it is a bit field where normal memory and device types are defined as follows: #define MT_S2_NORMAL 0xf #define MT_S2_DEVICE_nGnRE 0x1 I.e., masking *and* comparing with the latter matches on the former, and we have been getting lucky merely because the S2 device mappings also have the PTE_UXN bit set, or we would misidentify memory mappings as device mappings. Since the unmap_range() code path (which contains one instance of the flawed test) is used both for HYP mappings and stage-2 mappings, and considering the difference between the two, it is non-trivial to fix this by rewriting the tests in place, as it would involve passing down the type of mapping through all the functions. However, since HYP mappings and stage-2 mappings both deal with host physical addresses, we can simply check whether the mapping is backed by memory that is managed by the host kernel, and only perform the D-cache maintenance if this is the case. Signed-off-by:
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Lorenzo Pieralisi authored
commit de818bd4 upstream. The function graph tracer adds instrumentation that is required to trace both entry and exit of a function. In particular the function graph tracer updates the "return address" of a function in order to insert a trace callback on function exit. Kernel power management functions like cpu_suspend() are called upon power down entry with functions called "finishers" that are in turn called to trigger the power down sequence but they may not return to the kernel through the normal return path. When the core resumes from low-power it returns to the cpu_suspend() function through the cpu_resume path, which leaves the trace stack frame set-up by the function tracer in an incosistent state upon return to the kernel when tracing is enabled. This patch fixes the issue by pausing/resuming the function graph tracer on the thread executing cpu_suspend() (ie the function call that subsequently triggers the "suspend finishers"), so that the function graph tracer state is kept consistent across functions that enter power down states and never return by effectively disabling graph tracer while they are executing. Fixes: 819e50e2 ("arm64: Add ftrace support") Signed-off-by:
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reported-by:
AKASHI Takahiro <takahiro.akashi@linaro.org> Suggested-by:
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Zi Shen Lim authored
commit 14e589ff upstream. Turns out in the case of modulo by zero in a BPF program: A = A % X; (X == 0) the expected behavior is to terminate with return value 0. The bug in JIT is exposed by a new test case [1]. [1] https://lkml.org/lkml/2015/11/4/499Signed-off-by:
Zi Shen Lim <zlim.lnx@gmail.com> Reported-by:
Xi Wang <xi.wang@gmail.com> CC: Alexei Starovoitov <ast@plumgrid.com> Fixes: e54bcde3 ("arm64: eBPF JIT compiler") Signed-off-by:
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Zi Shen Lim authored
commit 251599e1 upstream. In the case of division by zero in a BPF program: A = A / X; (X == 0) the expected behavior is to terminate with return value 0. This is confirmed by the test case introduced in commit 86bf1721 ("test_bpf: add tests checking that JIT/interpreter sets A and X to 0."). Reported-by:
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Li Bin authored
commit 2ee8a74f upstream. By now, the recordmcount only records the function that in following sections: .text/.ref.text/.sched.text/.spinlock.text/.irqentry.text/ .kprobes.text/.text.unlikely For the function that not in these sections, the call mcount will be in place and not be replaced when kernel boot up. And it will bring performance overhead, such as do_mem_abort (in .exception.text section). This patch make the call mcount to nop for this case in recordmcount. Link: http://lkml.kernel.org/r/1446019445-14421-1-git-send-email-huawei.libin@huawei.com Link: http://lkml.kernel.org/r/1446193864-24593-4-git-send-email-huawei.libin@huawei.com Cc: <lkp@intel.com> Cc: <catalin.marinas@arm.com> Cc: <takahiro.akashi@linaro.org> Acked-by:
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Ulrich Weigand authored
commit a61674bd upstream. GCC 6 will include changes to generated code with -mcmodel=large, which is used to build kernel modules on powerpc64le. This was necessary because the large model is supposed to allow arbitrary sizes and locations of the code and data sections, but the ELFv2 global entry point prolog still made the unconditional assumption that the TOC associated with any particular function can be found within 2 GB of the function entry point: func: addis r2,r12,(.TOC.-func)@ha addi r2,r2,(.TOC.-func)@l .localentry func, .-func To remove this assumption, GCC will now generate instead this global entry point prolog sequence when using -mcmodel=large: .quad .TOC.-func func: .reloc ., R_PPC64_ENTRY ld r2, -8(r12) add r2, r2, r12 .localentry func, .-func The new .reloc triggers an optimization in the linker that will replace this new prolog with the original code (see above) if the linker determines that the distance between .TOC. and func is in range after all. Since this new relocation is now present in module object files, the kernel module loader is required to handle them too. This patch adds support for the new relocation and implements the same optimization done by the GNU linker. Signed-off-by:
Ulrich Weigand <ulrich.weigand@de.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Ulrich Weigand authored
commit 2e50c4be upstream. If a text section starts out with a data blob before the first function start label, disassembly parsing doing in recordmcount.pl gets confused on powerpc, leading to creation of corrupted module objects. This was not a problem so far since the compiler would never create such text sections. However, this has changed with a recent change in GCC 6 to support distances of > 2GB between a function and its assoicated TOC in the ELFv2 ABI, exposing this problem. There is already code in recordmcount.pl to handle such data blobs on the sparc64 platform. This patch uses the same method to handle those on powerpc as well. Acked-by:
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Boqun Feng authored
commit 81d7a329 upstream. According to memory-barriers.txt, xchg*, cmpxchg* and their atomic_ versions all need to be fully ordered, however they are now just RELEASE+ACQUIRE, which are not fully ordered. So also replace PPC_RELEASE_BARRIER and PPC_ACQUIRE_BARRIER with PPC_ATOMIC_ENTRY_BARRIER and PPC_ATOMIC_EXIT_BARRIER in __{cmp,}xchg_{u32,u64} respectively to guarantee fully ordered semantics of atomic{,64}_{cmp,}xchg() and {cmp,}xchg(), as a complement of commit b97021f8 ("powerpc: Fix atomic_xxx_return barrier semantics") This patch depends on patch "powerpc: Make value-returning atomics fully ordered" for PPC_ATOMIC_ENTRY_BARRIER definition. Signed-off-by:
Boqun Feng <boqun.feng@gmail.com> Reviewed-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
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Boqun Feng authored
commit 49e9cf3f upstream. According to memory-barriers.txt: > Any atomic operation that modifies some state in memory and returns > information about the state (old or new) implies an SMP-conditional > general memory barrier (smp_mb()) on each side of the actual > operation ... Which mean these operations should be fully ordered. However on PPC, PPC_ATOMIC_ENTRY_BARRIER is the barrier before the actual operation, which is currently "lwsync" if SMP=y. The leading "lwsync" can not guarantee fully ordered atomics, according to Paul Mckenney: https://lkml.org/lkml/2015/10/14/970 To fix this, we define PPC_ATOMIC_ENTRY_BARRIER as "sync" to guarantee the fully-ordered semantics. This also makes futex atomics fully ordered, which can avoid possible memory ordering problems if userspace code relies on futex system call for fully ordered semantics. Fixes: b97021f8 ("powerpc: Fix atomic_xxx_return barrier semantics") Signed-off-by:
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Stewart Smith authored
commit 98da62b7 upstream. When running on newer OPAL firmware that supports sending extra OPAL_MSG types, we would print a warning on *every* message received. This could be a problem for kernels that don't support OPAL_MSG_OCC on machines that are running real close to thermal limits and the OCC is throttling the chip. For a kernel that is paying attention to the message queue, we could get these notifications quite often. Conceivably, future message types could also come fairly often, and printing that we didn't understand them 10,000 times provides no further information than printing them once. Signed-off-by:
Stewart Smith <stewart@linux.vnet.ibm.com> Signed-off-by:
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Michael Neuling authored
commit 7f821fc9 upstream. Currently we can hit a scenario where we'll tm_reclaim() twice. This results in a TM bad thing exception because the second reclaim occurs when not in suspend mode. The scenario in which this can happen is the following. We attempt to deliver a signal to userspace. To do this we need obtain the stack pointer to write the signal context. To get this stack pointer we must tm_reclaim() in case we need to use the checkpointed stack pointer (see get_tm_stackpointer()). Normally we'd then return directly to userspace to deliver the signal without going through __switch_to(). Unfortunatley, if at this point we get an error (such as a bad userspace stack pointer), we need to exit the process. The exit will result in a __switch_to(). __switch_to() will attempt to save the process state which results in another tm_reclaim(). This tm_reclaim() now causes a TM Bad Thing exception as this state has already been saved and the processor is no longer in TM suspend mode. Whee! This patch checks the state of the MSR to ensure we are TM suspended before we attempt the tm_reclaim(). If we've already saved the state away, we should no longer be in TM suspend mode. This has the additional advantage of checking for a potential TM Bad Thing exception. Found using syscall fuzzer. Fixes: fb09692e ("powerpc: Add reclaim and recheckpoint functions for context switching transactional memory processes") Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
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Michael Neuling authored
commit d2b9d2a5 upstream. Currently we allow both the MSR T and S bits to be set by userspace on a signal return. Unfortunately this is a reserved configuration and will cause a TM Bad Thing exception if attempted (via rfid). This patch checks for this case in both the 32 and 64 bit signals code. If both T and S are set, we mark the context as invalid. Found using a syscall fuzzer. Fixes: 2b0a576d ("powerpc: Add new transactional memory state to the signal context") Signed-off-by:
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Dan Streetman authored
[ Upstream commit a8a572a6 ] Remove the dst_entries_init/destroy calls for xfrm4 and xfrm6 dst_ops templates; their dst_entries counters will never be used. Move the xfrm dst_ops initialization from the common xfrm/xfrm_policy.c to xfrm4/xfrm4_policy.c and xfrm6/xfrm6_policy.c, and call dst_entries_init and dst_entries_destroy for each net namespace. The ipv4 and ipv6 xfrms each create dst_ops template, and perform dst_entries_init on the templates. The template values are copied to each net namespace's xfrm.xfrm*_dst_ops. The problem there is the dst_ops pcpuc_entries field is a percpu counter and cannot be used correctly by simply copying it to another object. The result of this is a very subtle bug; changes to the dst entries counter from one net namespace may sometimes get applied to a different net namespace dst entries counter. This is because of how the percpu counter works; it has a main count field as well as a pointer to the percpu variables. Each net namespace maintains its own main count variable, but all point to one set of percpu variables. When any net namespace happens to change one of the percpu variables to outside its small batch range, its count is moved to the net namespace's main count variable. So with multiple net namespaces operating concurrently, the dst_ops entries counter can stray from the actual value that it should be; if counts are consistently moved from one net namespace to another (which my testing showed is likely), then one net namespace winds up with a negative dst_ops count while another winds up with a continually increasing count, eventually reaching its gc_thresh limit, which causes all new traffic on the net namespace to fail with -ENOBUFS. Signed-off-by:
Dan Streetman <dan.streetman@canonical.com> Signed-off-by:
Dan Streetman <ddstreet@ieee.org> Signed-off-by:
Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by:
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Joe Jin authored
[ Upstream commit ca88ea12 ] Sometimes xennet_create_queues() may failed to created all requested queues, we need to update num_queues to real created to avoid NULL pointer dereference. Signed-off-by:
Joe Jin <joe.jin@oracle.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Wei Liu <wei.liu2@citrix.com> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: David S. Miller <davem@davemloft.net> Reviewed-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Wei Liu authored
[ Upstream commit 32a84405 ] Originally that parameter was always reset to num_online_cpus during module initialisation, which renders it useless. The fix is to only set max_queues to num_online_cpus when user has not provided a value. Signed-off-by:
Wei Liu <wei.liu2@citrix.com> Cc: David Vrabel <david.vrabel@citrix.com> Reviewed-by:
David Vrabel <david.vrabel@citrix.com> Tested-by:
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Wei Liu authored
[ Upstream commit 4c82ac3c ] Originally that parameter was always reset to num_online_cpus during module initialisation, which renders it useless. The fix is to only set max_queues to num_online_cpus when user has not provided a value. Reported-by:
Johnny Strom <johnny.strom@linuxsolutions.fi> Signed-off-by:
Ian Campbell <ian.campbell@citrix.com> Signed-off-by:
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Karl Heiss authored
[ Upstream commit 635682a1 ] A case can occur when sctp_accept() is called by the user during a heartbeat timeout event after the 4-way handshake. Since sctp_assoc_migrate() changes both assoc->base.sk and assoc->ep, the bh_sock_lock in sctp_generate_heartbeat_event() will be taken with the listening socket but released with the new association socket. The result is a deadlock on any future attempts to take the listening socket lock. Note that this race can occur with other SCTP timeouts that take the bh_lock_sock() in the event sctp_accept() is called. BUG: soft lockup - CPU#9 stuck for 67s! [swapper:0] ... RIP: 0010:[<ffffffff8152d48e>] [<ffffffff8152d48e>] _spin_lock+0x1e/0x30 RSP: 0018:ffff880028323b20 EFLAGS: 00000206 RAX: 0000000000000002 RBX: ffff880028323b20 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff880028323be0 RDI: ffff8804632c4b48 RBP: ffffffff8100bb93 R08: 0000000000000000 R09: 0000000000000000 R10: ffff880610662280 R11: 0000000000000100 R12: ffff880028323aa0 R13: ffff8804383c3880 R14: ffff880028323a90 R15: ffffffff81534225 FS: 0000000000000000(0000) GS:ffff880028320000(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 00000000006df528 CR3: 0000000001a85000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 0, threadinfo ffff880616b70000, task ffff880616b6cab0) Stack: ffff880028323c40 ffffffffa01c2582 ffff880614cfb020 0000000000000000 <d> 0100000000000000 00000014383a6c44 ffff8804383c3880 ffff880614e93c00 <d> ffff880614e93c00 0000000000000000 ffff8804632c4b00 ffff8804383c38b8 Call Trace: <IRQ> [<ffffffffa01c2582>] ? sctp_rcv+0x492/0xa10 [sctp] [<ffffffff8148c559>] ? nf_iterate+0x69/0xb0 [<ffffffff814974a0>] ? ip_local_deliver_finish+0x0/0x2d0 [<ffffffff8148c716>] ? nf_hook_slow+0x76/0x120 [<ffffffff814974a0>] ? ip_local_deliver_finish+0x0/0x2d0 [<ffffffff8149757d>] ? ip_local_deliver_finish+0xdd/0x2d0 [<ffffffff81497808>] ? ip_local_deliver+0x98/0xa0 [<ffffffff81496ccd>] ? ip_rcv_finish+0x12d/0x440 [<ffffffff81497255>] ? ip_rcv+0x275/0x350 [<ffffffff8145cfeb>] ? __netif_receive_skb+0x4ab/0x750 ... With lockdep debugging: ===================================== [ BUG: bad unlock balance detected! ] ------------------------------------- CslRx/12087 is trying to release lock (slock-AF_INET) at: [<ffffffffa01bcae0>] sctp_generate_timeout_event+0x40/0xe0 [sctp] but there are no more locks to release! other info that might help us debug this: 2 locks held by CslRx/12087: #0: (&asoc->timers[i]){+.-...}, at: [<ffffffff8108ce1f>] run_timer_softirq+0x16f/0x3e0 #1: (slock-AF_INET){+.-...}, at: [<ffffffffa01bcac3>] sctp_generate_timeout_event+0x23/0xe0 [sctp] Ensure the socket taken is also the same one that is released by saving a copy of the socket before entering the timeout event critical section. Signed-off-by:
Karl Heiss <kheiss@gmail.com> Signed-off-by:
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Ido Schimmel authored
[ Upstream commit 60a6531b ] We can't be within an RCU read-side critical section when deleting VLANs, as underlying drivers might sleep during the hardware operation. Therefore, replace the RCU critical section with a mutex. This is consistent with team_vlan_rx_add_vid. Fixes: 3d249d4c ("net: introduce ethernet teaming device") Acked-by:
Jiri Pirko <jiri@mellanox.com> Signed-off-by:
Ido Schimmel <idosch@mellanox.com> Signed-off-by:
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Sven Eckelmann authored
[ Upstream commit 42eff6a6 ] It is not allowed to free the memory of an object which is part of a list which is protected by rcu-read-side-critical sections without making sure that no other context is accessing the object anymore. This usually happens by removing the references to this object and then waiting until the rcu grace period is over and no one (allowedly) accesses it anymore. But the _now functions ignore this completely. They free the object directly even when a different context still tries to access it. This has to be avoided and thus these functions must be removed and all functions have to use batadv_orig_node_free_ref. Fixes: 72822225 ("batman-adv: Fix rcu_barrier() miss due to double call_rcu() in TT code") Signed-off-by:
Sven Eckelmann <sven@narfation.org> Signed-off-by:
Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by:
Antonio Quartulli <a@unstable.cc> Signed-off-by:
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Sven Eckelmann authored
[ Upstream commit b4d922cf ] It is not allowed to free the memory of an object which is part of a list which is protected by rcu-read-side-critical sections without making sure that no other context is accessing the object anymore. This usually happens by removing the references to this object and then waiting until the rcu grace period is over and no one (allowedly) accesses it anymore. But the _now functions ignore this completely. They free the object directly even when a different context still tries to access it. This has to be avoided and thus these functions must be removed and all functions have to use batadv_hardif_free_ref. Fixes: 89652331 ("batman-adv: split tq information in neigh_node struct") Signed-off-by:
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