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- 01 Oct, 2020 17 commits
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Nick Desaulniers authored
commit 1e1b6d63 upstream. LLVM implemented a recent "libcall optimization" that lowers calls to `sprintf(dest, "%s", str)` where the return value is used to `stpcpy(dest, str) - dest`. This generally avoids the machinery involved in parsing format strings. `stpcpy` is just like `strcpy` except it returns the pointer to the new tail of `dest`. This optimization was introduced into clang-12. Implement this so that we don't observe linkage failures due to missing symbol definitions for `stpcpy`. Similar to last year's fire drill with: commit 5f074f3e ("lib/string.c: implement a basic bcmp") The kernel is somewhere between a "freestanding" environment (no full libc) and "hosted" environment (many symbols from libc exist with the same type, function signature, and semantics). As Peter Anvin notes, there's not really a great way to inform the compiler that you're targeting a freestanding environment but would like to opt-in to some libcall optimizations (see pr/47280 below), rather than opt-out. Arvind notes, -fno-builtin-* behaves slightly differently between GCC and Clang, and Clang is missing many __builtin_* definitions, which I consider a bug in Clang and am working on fixing. Masahiro summarizes the subtle distinction between compilers justly: To prevent transformation from foo() into bar(), there are two ways in Clang to do that; -fno-builtin-foo, and -fno-builtin-bar. There is only one in GCC; -fno-buitin-foo. (Any difference in that behavior in Clang is likely a bug from a missing __builtin_* definition.) Masahiro also notes: We want to disable optimization from foo() to bar(), but we may still benefit from the optimization from foo() into something else. If GCC implements the same transform, we would run into a problem because it is not -fno-builtin-bar, but -fno-builtin-foo that disables that optimization. In this regard, -fno-builtin-foo would be more future-proof than -fno-built-bar, but -fno-builtin-foo is still potentially overkill. We may want to prevent calls from foo() being optimized into calls to bar(), but we still may want other optimization on calls to foo(). It seems that compilers today don't quite provide the fine grain control over which libcall optimizations pseudo-freestanding environments would prefer. Finally, Kees notes that this interface is unsafe, so we should not encourage its use. As such, I've removed the declaration from any header, but it still needs to be exported to avoid linkage errors in modules. Reported-by:
Sami Tolvanen <samitolvanen@google.com> Suggested-by:
Andy Lavr <andy.lavr@gmail.com> Suggested-by:
Arvind Sankar <nivedita@alum.mit.edu> Suggested-by:
Joe Perches <joe@perches.com> Suggested-by:
Kees Cook <keescook@chromium.org> Suggested-by:
Masahiro Yamada <masahiroy@kernel.org> Suggested-by:
Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by:
Nick Desaulniers <ndesaulniers@google.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Tested-by:
Nathan Chancellor <natechancellor@gmail.com> Cc: <stable@vger.kernel.org> Link: https://lkml.kernel.org/r/20200914161643.938408-1-ndesaulniers@google.com Link: https://bugs.llvm.org/show_bug.cgi?id=47162 Link: https://bugs.llvm.org/show_bug.cgi?id=47280 Link: https://github.com/ClangBuiltLinux/linux/issues/1126 Link: https://man7.org/linux/man-pages/man3/stpcpy.3.html Link: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stpcpy.html Link: https://reviews.llvm.org/D85963Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Kai-Heng Feng authored
commit f73bbf63 upstream. On Lenovo P520, the front panel headset LED isn't lit up right now. Realtek states that the LED needs to be enabled by ALC233's GPIO2, so let's do it accordingly to light the LED up. Signed-off-by:
Kai-Heng Feng <kai.heng.feng@canonical.com> Acked-by:
Hui Wang <hui.wang@canonical.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200914070231.13192-1-kai.heng.feng@canonical.comSigned-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Hui Wang authored
commit 3f742490 upstream. We found a Mic detection issue on many Lenovo laptops, those laptops belong to differnt models and they have different audio design like internal mic connects to the codec or PCH, they all have this problem, the problem is if plugging a headset before powerup/reboot the machine, after booting up, the headphone could be detected but Mic couldn't. If we plug out and plug in the headset, both headphone and Mic could be detected then. Through debugging we found the codec on those laptops are same, it is alc257, and if we don't disable the 3k pulldown in alc256_shutup(), the issue will be fixed. So far there is no pop noise or power consumption regression on those laptops after this change. Cc: Kailang Yang <kailang@realtek.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Joakim Tjernlund authored
commit 315c7ad7 upstream. Needs the same delay as H650e Signed-off-by:
Joakim Tjernlund <joakim.tjernlund@infinera.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200910085328.19188-1-joakim.tjernlund@infinera.comSigned-off-by:
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Thomas Gleixner authored
commit 86a82ae0 upstream. Several people reported in the kernel bugzilla that between v4.12 and v4.13 the magic which works around broken hardware and BIOSes to find the proper timer interrupt delivery mode stopped working for some older affected platforms which need to fall back to ExtINT delivery mode. The reason is that the core code changed to keep track of the masked and disabled state of an interrupt line more accurately to avoid the expensive hardware operations. That broke an assumption in i8259_make_irq() which invokes disable_irq_nosync(); irq_set_chip_and_handler(); enable_irq(); Up to v4.12 this worked because enable_irq() unconditionally unmasked the interrupt line, but after the state tracking improvements this is not longer the case because the IO/APIC uses lazy disabling. So the line state is unmasked which means that enable_irq() does not call into the new irq chip to unmask it. In principle this is a shortcoming of the core code, but it's more than unclear whether the core code should try to reset state. At least this cannot be done unconditionally as that would break other existing use cases where the chip type is changed, e.g. when changing the trigger type, but the callers expect the state to be preserved. As the way how check_timer() is switching the delivery modes is truly unique, the obvious fix is to simply unmask the i8259 manually after changing the mode to ExtINT delivery and switching the irq chip to the legacy PIC. Note, that the fixes tag is not really precise, but identifies the commit which broke the assumptions in the IO/APIC and i8259 code and that's the kernel version to which this needs to be backported. Fixes: bf22ff45 ("genirq: Avoid unnecessary low level irq function calls") Reported-by: p_c_chan@hotmail.com Reported-by: ecm4@mail.com Reported-by: perdigao1@yahoo.com Reported-by: matzes@users.sourceforge.net Reported-by: rvelascog@gmail.com Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Tested-by: p_c_chan@hotmail.com Tested-by: matzes@users.sourceforge.net Cc: stable@vger.kernel.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=197769Signed-off-by:
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Mikulas Patocka authored
commit a1cd6c2a upstream. If we copy less than 8 bytes and if the destination crosses a cache line, __copy_user_flushcache would invalidate only the first cache line. This patch makes it invalidate the second cache line as well. Fixes: 0aed55af ("x86, uaccess: introduce copy_from_iter_flushcache for pmem / cache-bypass operations") Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
Dan Williams <dan.j.wiilliams@intel.com> Cc: Jan Kara <jack@suse.cz> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: <stable@vger.kernel.org> Link: https://lkml.kernel.org/r/alpine.LRH.2.02.2009161451140.21915@file01.intranet.prod.int.rdu2.redhat.comSigned-off-by:
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Sakari Ailus authored
[ Upstream commit a5b1d541 ] If NVM reading failed, the device was left powered on. Fix that. Signed-off-by:
Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by:
Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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Russell King authored
[ Upstream commit 175fc928 ] Propagate the error code from request_irq(), rather than returning -EBUSY. Signed-off-by:
Russell King <rmk+kernel@armlinux.org.uk> Link: https://lore.kernel.org/r/E1iNIqh-0000tW-EZ@rmk-PC.armlinux.org.ukSigned-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Kangjie Lu authored
[ Upstream commit 57a25a5f ] `best_clock` is an object that may be sent out. Object `clock` contains uninitialized bytes that are copied to `best_clock`, which leads to memory disclosure and information leak. Signed-off-by:
Kangjie Lu <kjlu@umn.edu> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20191018042953.31099-1-kjlu@umn.eduSigned-off-by:
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Fuqian Huang authored
[ Upstream commit 7cf78b6b ] When the option is RTC_PLL_GET, pll will be copied to userland via copy_to_user. pll is initialized using mach_get_rtc_pll indirect call and mach_get_rtc_pll is only assigned with function q40_get_rtc_pll in arch/m68k/q40/config.c. In function q40_get_rtc_pll, the field pll_ctrl is not initialized. This will leak uninitialized stack content to userland. Fix this by zeroing the uninitialized field. Signed-off-by:
Fuqian Huang <huangfq.daxian@gmail.com> Link: https://lore.kernel.org/r/20190927121544.7650-1-huangfq.daxian@gmail.comSigned-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Balsundar P authored
[ Upstream commit c86fbe48 ] The driver fails to handle data when read or written beyond device reported LBA, which triggers kernel panic Link: https://lore.kernel.org/r/1571120524-6037-2-git-send-email-balsundar.p@microsemi.comSigned-off-by:
Balsundar P <balsundar.p@microsemi.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
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Jia He authored
[ Upstream commit 83d116c5 ] When we tested pmdk unit test [1] vmmalloc_fork TEST3 on arm64 guest, there will be a double page fault in __copy_from_user_inatomic of cow_user_page. To reproduce the bug, the cmd is as follows after you deployed everything: make -C src/test/vmmalloc_fork/ TEST_TIME=60m check Below call trace is from arm64 do_page_fault for debugging purpose: [ 110.016195] Call trace: [ 110.016826] do_page_fault+0x5a4/0x690 [ 110.017812] do_mem_abort+0x50/0xb0 [ 110.018726] el1_da+0x20/0xc4 [ 110.019492] __arch_copy_from_user+0x180/0x280 [ 110.020646] do_wp_page+0xb0/0x860 [ 110.021517] __handle_mm_fault+0x994/0x1338 [ 110.022606] handle_mm_fault+0xe8/0x180 [ 110.023584] do_page_fault+0x240/0x690 [ 110.024535] do_mem_abort+0x50/0xb0 [ 110.025423] el0_da+0x20/0x24 The pte info before __copy_from_user_inatomic is (PTE_AF is cleared): [ffff9b007000] pgd=000000023d4f8003, pud=000000023da9b003, pmd=000000023d4b3003, pte=360000298607bd3 As told by Catalin: "On arm64 without hardware Access Flag, copying from user will fail because the pte is old and cannot be marked young. So we always end up with zeroed page after fork() + CoW for pfn mappings. we don't always have a hardware-managed access flag on arm64." This patch fixes it by calling pte_mkyoung. Also, the parameter is changed because vmf should be passed to cow_user_page() Add a WARN_ON_ONCE when __copy_from_user_inatomic() returns error in case there can be some obscure use-case (by Kirill). [1] https://github.com/pmem/pmdk/tree/master/src/test/vmmalloc_forkSigned-off-by:
Jia He <justin.he@arm.com> Reported-by:
Yibo Cai <Yibo.Cai@arm.com> Reviewed-by:
Catalin Marinas <catalin.marinas@arm.com> Acked-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by:
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Miaoqing Pan authored
[ Upstream commit 486a8849 ] The memory of ar->debug.tpc_stats_final is reallocated every debugfs reading, it should be freed in ath10k_debug_destroy() for the last allocation. Tested HW: QCA9984 Tested FW: 10.4-3.9.0.2-00035 Signed-off-by:
Miaoqing Pan <miaoqing@codeaurora.org> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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Miaoqing Pan authored
[ Upstream commit c5329b2d ] If firmware reports rate_max > WMI_TPC_RATE_MAX(WMI_TPC_FINAL_RATE_MAX) or num_tx_chain > WMI_TPC_TX_N_CHAIN, it will cause array out-of-bounds access, so print a warning and reset to avoid memory corruption. Tested HW: QCA9984 Tested FW: 10.4-3.9.0.2-00035 Signed-off-by:
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Chris Wilson authored
[ Upstream commit 9c98f021 ] Make dma_fence_enable_sw_signaling() behave like its dma_fence_add_callback() and dma_fence_default_wait() counterparts and perform the test to enable signaling under the fence->lock, along with the action to do so. This ensure that should an implementation be trying to flush the cb_list (by signaling) on retirement before freeing the fence, it can do so in a race-free manner. See also 0fc89b68 ("dma-fence: Simply wrap dma_fence_signal_locked with dma_fence_signal"). v2: Refactor all 3 enable_signaling paths to use a common function. v3: Don't argue, just keep the tracepoint in the existing spot. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191004101140.32713-1-chris@chris-wilson.co.ukSigned-off-by:
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zhengbin authored
[ Upstream commit 713f871b ] In media_device_register_entity, if media_graph_walk_init fails, need to free the previously memory. Reported-by:
Hulk Robot <hulkci@huawei.com> Signed-off-by:
zhengbin <zhengbin13@huawei.com> Signed-off-by:
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Jonathan Lebon authored
[ Upstream commit 3e3e24b4 ] Currently, the SELinux LSM prevents one from setting the `security.selinux` xattr on an inode without a policy first being loaded. However, this restriction is problematic: it makes it impossible to have newly created files with the correct label before actually loading the policy. This is relevant in distributions like Fedora, where the policy is loaded by systemd shortly after pivoting out of the initrd. In such instances, all files created prior to pivoting will be unlabeled. One then has to relabel them after pivoting, an operation which inherently races with other processes trying to access those same files. Going further, there are use cases for creating the entire root filesystem on first boot from the initrd (e.g. Container Linux supports this today[1], and we'd like to support it in Fedora CoreOS as well[2]). One can imagine doing this in two ways: at the block device level (e.g. laying down a disk image), or at the filesystem level. In the former, labeling can simply be part of the image. But even in the latter scenario, one still really wants to be able to set the right labels when populating the new filesystem. This patch enables this by changing behaviour in the following two ways: 1. allow `setxattr` if we're not initialized 2. don't try to set the in-core inode SID if we're not initialized; instead leave it as `LABEL_INVALID` so that revalidation may be attempted at a later time Note the first hunk of this patch is mostly the same as a previously discussed one[3], though it was part of a larger series which wasn't accepted. [1] https://coreos.com/os/docs/latest/root-filesystem-placement.html [2] https://github.com/coreos/fedora-coreos-tracker/issues/94 [3] https://www.spinics.net/lists/linux-initramfs/msg04593.htmlCo-developed-by:
Victor Kamensky <kamensky@cisco.com> Signed-off-by:
Jonathan Lebon <jlebon@redhat.com> Signed-off-by:
Paul Moore <paul@paul-moore.com> Signed-off-by:
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- 26 Sep, 2020 23 commits
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Greg Kroah-Hartman authored
Tested-by:
Jon Hunter <jonathanh@nvidia.com> Tested-by:
Shuah Khan <skhan@linuxfoundation.org> Tested-by:
Linux Kernel Functional Testing <lkft@linaro.org> Tested-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Lukas Wunner authored
commit e0a851fe upstream. If the call to uart_add_one_port() in serial8250_register_8250_port() fails, a half-initialized entry in the serial_8250ports[] array is left behind. A subsequent reprobe of the same serial port causes that entry to be reused. Because uart->port.dev is set, uart_remove_one_port() is called for the half-initialized entry and bails out with an error message: bcm2835-aux-uart 3f215040.serial: Removing wrong port: (null) != (ptrval) The same happens on failure of mctrl_gpio_init() since commit 4a96895f ("tty/serial/8250: use mctrl_gpio helpers"). Fix by zeroing the uart->port.dev pointer in the probe error path. The bug was introduced in v2.6.10 by historical commit befff6f5 ("[SERIAL] Add new port registration/unregistration functions."): https://git.kernel.org/tglx/history/c/befff6f5bf5f The commit added an unconditional call to uart_remove_one_port() in serial8250_register_port(). In v3.7, commit 835d844d ("8250_pnp: do pnp probe before legacy probe") made that call conditional on uart->port.dev which allows me to fix the issue by zeroing that pointer in the error path. Thus, the present commit will fix the problem as far back as v3.7 whereas still older versions need to also cherry-pick 835d844d. Fixes: 835d844d ("8250_pnp: do pnp probe before legacy probe") Signed-off-by:
Lukas Wunner <lukas@wunner.de> Cc: stable@vger.kernel.org # v2.6.10 Cc: stable@vger.kernel.org # v2.6.10: 835d844d: 8250_pnp: do pnp probe before legacy Reviewed-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/b4a072013ee1a1d13ee06b4325afb19bda57ca1b.1589285873.git.lukas@wunner.de [iwamatsu: Backported to 4.14, 4.19: adjust context] Signed-off-by:
Nobuhiro Iwamatsu (CIP) <nobuhiro1.iwamatsu@toshiba.co.jp> Signed-off-by:
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Priyaranjan Jha authored
commit 78dc70eb upstream. Aggregation effects are extremely common with wifi, cellular, and cable modem link technologies, ACK decimation in middleboxes, and LRO and GRO in receiving hosts. The aggregation can happen in either direction, data or ACKs, but in either case the aggregation effect is visible to the sender in the ACK stream. Previously BBR's sending was often limited by cwnd under severe ACK aggregation/decimation because BBR sized the cwnd at 2*BDP. If packets were acked in bursts after long delays (e.g. one ACK acking 5*BDP after 5*RTT), BBR's sending was halted after sending 2*BDP over 2*RTT, leaving the bottleneck idle for potentially long periods. Note that loss-based congestion control does not have this issue because when facing aggregation it continues increasing cwnd after bursts of ACKs, growing cwnd until the buffer is full. To achieve good throughput in the presence of aggregation effects, this algorithm allows the BBR sender to put extra data in flight to keep the bottleneck utilized during silences in the ACK stream that it has evidence to suggest were caused by aggregation. A summary of the algorithm: when a burst of packets are acked by a stretched ACK or a burst of ACKs or both, BBR first estimates the expected amount of data that should have been acked, based on its estimated bandwidth. Then the surplus ("extra_acked") is recorded in a windowed-max filter to estimate the recent level of observed ACK aggregation. Then cwnd is increased by the ACK aggregation estimate. The larger cwnd avoids BBR being cwnd-limited in the face of ACK silences that recent history suggests were caused by aggregation. As a sanity check, the ACK aggregation degree is upper-bounded by the cwnd (at the time of measurement) and a global max of BW * 100ms. The algorithm is further described by the following presentation: https://datatracker.ietf.org/meeting/101/materials/slides-101-iccrg-an-update-on-bbr-work-at-google-00 In our internal testing, we observed a significant increase in BBR throughput (measured using netperf), in a basic wifi setup. - Host1 (sender on ethernet) -> AP -> Host2 (receiver on wifi) - 2.4 GHz -> BBR before: ~73 Mbps; BBR after: ~102 Mbps; CUBIC: ~100 Mbps - 5.0 GHz -> BBR before: ~362 Mbps; BBR after: ~593 Mbps; CUBIC: ~601 Mbps Also, this code is running globally on YouTube TCP connections and produced significant bandwidth increases for YouTube traffic. This is based on Ian Swett's max_ack_height_ algorithm from the QUIC BBR implementation. Signed-off-by:
Priyaranjan Jha <priyarjha@google.com> Signed-off-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Priyaranjan Jha authored
commit 232aa8ec upstream. Because bbr_target_cwnd() is really a general-purpose BBR helper for computing some volume of inflight data as a function of the estimated BDP, refactor it into following helper functions: - bbr_bdp() - bbr_quantization_budget() - bbr_inflight() Signed-off-by:
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Xunlei Pang authored
commit e3336cab upstream. We've met softlockup with "CONFIG_PREEMPT_NONE=y", when the target memcg doesn't have any reclaimable memory. It can be easily reproduced as below: watchdog: BUG: soft lockup - CPU#0 stuck for 111s![memcg_test:2204] CPU: 0 PID: 2204 Comm: memcg_test Not tainted 5.9.0-rc2+ #12 Call Trace: shrink_lruvec+0x49f/0x640 shrink_node+0x2a6/0x6f0 do_try_to_free_pages+0xe9/0x3e0 try_to_free_mem_cgroup_pages+0xef/0x1f0 try_charge+0x2c1/0x750 mem_cgroup_charge+0xd7/0x240 __add_to_page_cache_locked+0x2fd/0x370 add_to_page_cache_lru+0x4a/0xc0 pagecache_get_page+0x10b/0x2f0 filemap_fault+0x661/0xad0 ext4_filemap_fault+0x2c/0x40 __do_fault+0x4d/0xf9 handle_mm_fault+0x1080/0x1790 It only happens on our 1-vcpu instances, because there's no chance for oom reaper to run to reclaim the to-be-killed process. Add a cond_resched() at the upper shrink_node_memcgs() to solve this issue, this will mean that we will get a scheduling point for each memcg in the reclaimed hierarchy without any dependency on the reclaimable memory in that memcg thus making it more predictable. Suggested-by:
Michal Hocko <mhocko@suse.com> Signed-off-by:
Xunlei Pang <xlpang@linux.alibaba.com> Signed-off-by:
Chris Down <chris@chrisdown.name> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Link: http://lkml.kernel.org/r/1598495549-67324-1-git-send-email-xlpang@linux.alibaba.comSigned-off-by:
Julius Hemanth Pitti <jpitti@cisco.com> Signed-off-by:
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Masahiro Yamada authored
commit a0d1c951 upstream. As Documentation/kbuild/llvm.rst implies, building the kernel with a full set of LLVM tools gets very verbose and unwieldy. Provide a single switch LLVM=1 to use Clang and LLVM tools instead of GCC and Binutils. You can pass it from the command line or as an environment variable. Please note LLVM=1 does not turn on the integrated assembler. You need to pass LLVM_IAS=1 to use it. When the upstream kernel is ready for the integrated assembler, I think we can make it default. We discussed what we need, and we agreed to go with a simple boolean flag that switches both target and host tools: https://lkml.org/lkml/2020/3/28/494 https://lkml.org/lkml/2020/4/3/43 Some items discussed, but not adopted: - LLVM_DIR When multiple versions of LLVM are installed, I just thought supporting LLVM_DIR=/path/to/my/llvm/bin/ might be useful. CC = $(LLVM_DIR)clang LD = $(LLVM_DIR)ld.lld ... However, we can handle this by modifying PATH. So, we decided to not do this. - LLVM_SUFFIX Some distributions (e.g. Debian) package specific versions of LLVM with naming conventions that use the version as a suffix. CC = clang$(LLVM_SUFFIX) LD = ld.lld(LLVM_SUFFIX) ... will allow a user to pass LLVM_SUFFIX=-11 to use clang-11 etc., but the suffixed versions in /usr/bin/ are symlinks to binaries in /usr/lib/llvm-#/bin/, so this can also be handled by PATH. Signed-off-by:
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Masahiro Yamada authored
commit 7e20e47c upstream. The 'AS' variable is unused for building the kernel. Only the remaining usage is to turn on the integrated assembler. A boolean flag is a better fit for this purpose. AS=clang was added for experts. So, I replaced it with LLVM_IAS=1, breaking the backward compatibility. Suggested-by:
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Masahiro Yamada authored
commit aa824e0c upstream. As commit 5ef87263 ("kbuild: get rid of misleading $(AS) from documents") noted, we rarely use $(AS) directly in the kernel build. Now that the only/last user of $(AS) in drivers/net/wan/Makefile was converted to $(CC), $(AS) is no longer used in the build process. You can still pass in AS=clang, which is just a switch to turn on the LLVM integrated assembler. Signed-off-by:
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Dmitry Golovin authored
commit eefb8c12 upstream. Introduce a new READELF variable to top-level Makefile, so the name of readelf binary can be specified. Before this change the name of the binary was hardcoded to "$(CROSS_COMPILE)readelf" which might not be present for every toolchain. This allows to build with LLVM Object Reader by using make parameter READELF=llvm-readelf. Link: https://github.com/ClangBuiltLinux/linux/issues/771Signed-off-by:
Dmitry Golovin <dima@golovin.in> Reviewed-by:
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Masahiro Yamada authored
commit 734f3719 upstream. The firmware source, wanxlfw.S, is currently compiled by the combo of $(CPP) and $(M68KAS). This is not what we usually do for compiling *.S files. In fact, this Makefile is the only user of $(AS) in the kernel build. Instead of combining $(CPP) and (AS) from different tool sets, using $(M68KCC) as an assembler driver is simpler, and saner. Signed-off-by:
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Masahiro Yamada authored
commit 63b903df upstream. As far as I understood from the Kconfig help text, this build rule is used to rebuild the driver firmware, which runs on an old m68k-based chip. So, you need m68k tools for the firmware rebuild. wanxl.c is a PCI driver, but CONFIG_M68K does not select CONFIG_HAVE_PCI. So, you cannot enable CONFIG_WANXL_BUILD_FIRMWARE for ARCH=m68k. In other words, ifeq ($(ARCH),m68k) is false here. I am keeping the dead code for now, but rebuilding the firmware requires 'as68k' and 'ld68k', which I do not have in hand. Instead, the kernel.org m68k GCC [1] successfully built it. Allowing a user to pass in CROSS_COMPILE_M68K= is handier. [1] https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/9.2.0/x86_64-gcc-9.2.0-nolibc-m68k-linux.tar.xzSuggested-by:
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Fangrui Song authored
commit 0f44fbc1 upstream. The tool is called llvm-size, not llvm-objsize. Fixes: fcf1b6a3 ("Documentation/llvm: add documentation on building w/ Clang/LLVM") Signed-off-by:
Fangrui Song <maskray@google.com> Reviewed-by:
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Nick Desaulniers authored
commit fcf1b6a3 upstream. added to kbuild documentation. Provides more official info on building kernels with Clang and LLVM than our wiki. Suggested-by:
Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by:
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Vasily Gorbik authored
commit 7bac9870 upstream. Define and export OBJSIZE variable for "size" tool from binutils to be used in architecture specific Makefiles (naming the variable just "SIZE" would be too risky). In particular this tool is useful to perform checks that early boot code is not using bss section (which might have not been zeroed yet or intersects with initrd or other files boot loader might have put right after the linux kernel). Link: http://lkml.kernel.org/r/patch-1.thread-2257a1.git-188f5a3d81d5.your-ad-here.call-01565088755-ext-5120@work.hoursAcked-by:
Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com> [nd: conflict in exported vars list from not backporting commit e83b9f55 ("kbuild: add ability to generate BTF type info for vmlinux")] Signed-off-by:
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Nick Desaulniers authored
commit 8708e13c upstream. Add keyword support so that our mailing list gets cc'ed for clang/llvm patches. We're pretty active on our mailing list so far as code review. There are numerous Googlers like myself that are paid to support building the Linux kernel with Clang and LLVM. Link: http://lkml.kernel.org/r/20190620001907.255803-1-ndesaulniers@google.comSigned-off-by:
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David Ahern authored
[ Upstream commit 2fbc6e89 ] Kfir reported that pmtu exceptions are not created properly for deployments where multipath routes use the same device. After some digging I see 2 compounding problems: 1. ip_route_output_key_hash_rcu is updating the flowi4_oif *after* the route lookup. This is the second use case where this has been a problem (the first is related to use of vti devices with VRF). I can not find any reason for the oif to be changed after the lookup; the code goes back to the start of git. It does not seem logical so remove it. 2. fib_lookups for exceptions do not call fib_select_path to handle multipath route selection based on the hash. The end result is that the fib_lookup used to add the exception always creates it based using the first leg of the route. An example topology showing the problem: | host1 +------+ | eth0 | .209 +------+ | +------+ switch | br0 | +------+ | +---------+---------+ | host2 | host3 +------+ +------+ | eth0 | .250 | eth0 | 192.168.252.252 +------+ +------+ +-----+ +-----+ | vti | .2 | vti | 192.168.247.3 +-----+ +-----+ \ / ================================= tunnels 192.168.247.1/24 for h in host1 host2 host3; do ip netns add ${h} ip -netns ${h} link set lo up ip netns exec ${h} sysctl -wq net.ipv4.ip_forward=1 done ip netns add switch ip -netns switch li set lo up ip -netns switch link add br0 type bridge stp 0 ip -netns switch link set br0 up for n in 1 2 3; do ip -netns switch link add eth-sw type veth peer name eth-h${n} ip -netns switch li set eth-h${n} master br0 up ip -netns switch li set eth-sw netns host${n} name eth0 done ip -netns host1 addr add 192.168.252.209/24 dev eth0 ip -netns host1 link set dev eth0 up ip -netns host1 route add 192.168.247.0/24 \ nexthop via 192.168.252.250 dev eth0 nexthop via 192.168.252.252 dev eth0 ip -netns host2 addr add 192.168.252.250/24 dev eth0 ip -netns host2 link set dev eth0 up ip -netns host2 addr add 192.168.252.252/24 dev eth0 ip -netns host3 link set dev eth0 up ip netns add tunnel ip -netns tunnel li set lo up ip -netns tunnel li add br0 type bridge ip -netns tunnel li set br0 up for n in $(seq 11 20); do ip -netns tunnel addr add dev br0 192.168.247.${n}/24 done for n in 2 3 do ip -netns tunnel link add vti${n} type veth peer name eth${n} ip -netns tunnel link set eth${n} mtu 1360 master br0 up ip -netns tunnel link set vti${n} netns host${n} mtu 1360 up ip -netns host${n} addr add dev vti${n} 192.168.247.${n}/24 done ip -netns tunnel ro add default nexthop via 192.168.247.2 nexthop via 192.168.247.3 ip netns exec host1 ping -M do -s 1400 -c3 -I 192.168.252.209 192.168.247.11 ip netns exec host1 ping -M do -s 1400 -c3 -I 192.168.252.209 192.168.247.15 ip -netns host1 ro ls cache Before this patch the cache always shows exceptions against the first leg in the multipath route; 192.168.252.250 per this example. Since the hash has an initial random seed, you may need to vary the final octet more than what is listed. In my tests, using addresses between 11 and 19 usually found 1 that used both legs. With this patch, the cache will have exceptions for both legs. Fixes: 4895c771 ("ipv4: Add FIB nexthop exceptions") Reported-by:
Kfir Itzhak <mastertheknife@gmail.com> Signed-off-by:
David Ahern <dsahern@kernel.org> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 4a009cb0 ] skb_put_padto() and __skb_put_padto() callers must check return values or risk use-after-free. Signed-off-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 3ca1a42a ] If skb_put_padto() returns an error, skb has been freed. Better not touch it anymore, as reported by syzbot [1] Note to qrtr maintainers : this suggests qrtr_sendmsg() should adjust sock_alloc_send_skb() second parameter to account for the potential added alignment to avoid reallocation. [1] BUG: KASAN: use-after-free in __skb_insert include/linux/skbuff.h:1907 [inline] BUG: KASAN: use-after-free in __skb_queue_before include/linux/skbuff.h:2016 [inline] BUG: KASAN: use-after-free in __skb_queue_tail include/linux/skbuff.h:2049 [inline] BUG: KASAN: use-after-free in skb_queue_tail+0x6b/0x120 net/core/skbuff.c:3146 Write of size 8 at addr ffff88804d8ab3c0 by task syz-executor.4/4316 CPU: 1 PID: 4316 Comm: syz-executor.4 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d6/0x29e lib/dump_stack.c:118 print_address_description+0x66/0x620 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 __skb_insert include/linux/skbuff.h:1907 [inline] __skb_queue_before include/linux/skbuff.h:2016 [inline] __skb_queue_tail include/linux/skbuff.h:2049 [inline] skb_queue_tail+0x6b/0x120 net/core/skbuff.c:3146 qrtr_tun_send+0x1a/0x40 net/qrtr/tun.c:23 qrtr_node_enqueue+0x44f/0xc00 net/qrtr/qrtr.c:364 qrtr_bcast_enqueue+0xbe/0x140 net/qrtr/qrtr.c:861 qrtr_sendmsg+0x680/0x9c0 net/qrtr/qrtr.c:960 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] sock_write_iter+0x317/0x470 net/socket.c:998 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xa96/0xd10 fs/read_write.c:578 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f84b5b81c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000038b40 RCX: 000000000045d5b9 RDX: 0000000000000055 RSI: 0000000020001240 RDI: 0000000000000003 RBP: 00007f84b5b81ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000f R13: 00007ffcbbf86daf R14: 00007f84b5b829c0 R15: 000000000118cf4c Allocated by task 4316: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461 slab_post_alloc_hook+0x3e/0x290 mm/slab.h:518 slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x1c1/0x2d0 mm/slab.c:3482 skb_clone+0x1b2/0x370 net/core/skbuff.c:1449 qrtr_bcast_enqueue+0x6d/0x140 net/qrtr/qrtr.c:857 qrtr_sendmsg+0x680/0x9c0 net/qrtr/qrtr.c:960 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] sock_write_iter+0x317/0x470 net/socket.c:998 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xa96/0xd10 fs/read_write.c:578 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4316: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:56 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free+0x82/0xf0 mm/slab.c:3693 __skb_pad+0x3f5/0x5a0 net/core/skbuff.c:1823 __skb_put_padto include/linux/skbuff.h:3233 [inline] skb_put_padto include/linux/skbuff.h:3252 [inline] qrtr_node_enqueue+0x62f/0xc00 net/qrtr/qrtr.c:360 qrtr_bcast_enqueue+0xbe/0x140 net/qrtr/qrtr.c:861 qrtr_sendmsg+0x680/0x9c0 net/qrtr/qrtr.c:960 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] sock_write_iter+0x317/0x470 net/socket.c:998 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xa96/0xd10 fs/read_write.c:578 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88804d8ab3c0 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 0 bytes inside of 224-byte region [ffff88804d8ab3c0, ffff88804d8ab4a0) The buggy address belongs to the page: page:00000000ea8cccfb refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804d8abb40 pfn:0x4d8ab flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002237ec8 ffffea00029b3388 ffff88821bb66800 raw: ffff88804d8abb40 ffff88804d8ab000 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Fixes: ce57785b ("net: qrtr: fix len of skb_put_padto in qrtr_node_enqueue") Signed-off-by:
syzbot <syzkaller@googlegroups.com> Cc: Carl Huang <cjhuang@codeaurora.org> Cc: Wen Gong <wgong@codeaurora.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by:
Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Reviewed-by:
Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by:
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Florian Fainelli authored
[ Upstream commit c2b727df ] If we have unbound the PHY driver prior to calling phy_detach() (often via phy_disconnect()) then we can cause a NULL pointer de-reference accessing the driver owner member. The steps to reproduce are: echo unimac-mdio-0:01 > /sys/class/net/eth0/phydev/driver/unbind ip link set eth0 down Fixes: cafe8df8 ("net: phy: Fix lack of reference count on PHY driver") Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Reviewed-by:
Andrew Lunn <andrew@lunn.ch> Signed-off-by:
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Michael Chan authored
[ Upstream commit a5390690 ] All changes related to bp->link_info require the protection of the link_lock mutex. It's not sufficient to rely just on RTNL. Fixes: 163e9ef6 ("bnxt_en: Fix race when modifying pause settings.") Reviewed-by:
Edwin Peer <edwin.peer@broadcom.com> Signed-off-by:
Michael Chan <michael.chan@broadcom.com> Signed-off-by:
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Edwin Peer authored
[ Upstream commit d69753fa ] Returning "unknown" as a temperature value violates the hwmon interface rules. Appropriate error codes should be returned via device_attribute show instead. These will ultimately be propagated to the user via the file system interface. In addition to the corrected error handling, it is an even better idea to not present the sensor in sysfs at all if it is known that the read will definitely fail. Given that temp1_input is currently the only sensor reported, ensure no hwmon registration if TEMP_MONITOR_QUERY is not supported or if it will fail due to access permissions. Something smarter may be needed if and when other sensors are added. Fixes: 12cce90b ("bnxt_en: fix HWRM error when querying VF temperature") Signed-off-by:
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Xin Long authored
[ Upstream commit ff48b622 ] In tipc_buf_append() it may change skb's frag_list, and it causes problems when this skb is cloned. skb_unclone() doesn't really make this skb's flag_list available to change. Shuang Li has reported an use-after-free issue because of this when creating quite a few macvlan dev over the same dev, where the broadcast packets will be cloned and go up to the stack: [ ] BUG: KASAN: use-after-free in pskb_expand_head+0x86d/0xea0 [ ] Call Trace: [ ] dump_stack+0x7c/0xb0 [ ] print_address_description.constprop.7+0x1a/0x220 [ ] kasan_report.cold.10+0x37/0x7c [ ] check_memory_region+0x183/0x1e0 [ ] pskb_expand_head+0x86d/0xea0 [ ] process_backlog+0x1df/0x660 [ ] net_rx_action+0x3b4/0xc90 [ ] [ ] Allocated by task 1786: [ ] kmem_cache_alloc+0xbf/0x220 [ ] skb_clone+0x10a/0x300 [ ] macvlan_broadcast+0x2f6/0x590 [macvlan] [ ] macvlan_process_broadcast+0x37c/0x516 [macvlan] [ ] process_one_work+0x66a/0x1060 [ ] worker_thread+0x87/0xb10 [ ] [ ] Freed by task 3253: [ ] kmem_cache_free+0x82/0x2a0 [ ] skb_release_data+0x2c3/0x6e0 [ ] kfree_skb+0x78/0x1d0 [ ] tipc_recvmsg+0x3be/0xa40 [tipc] So fix it by using skb_unshare() instead, which would create a new skb for the cloned frag and it'll be safe to change its frag_list. The similar things were also done in sctp_make_reassembled_event(), which is using skb_copy(). Reported-by:
Shuang Li <shuali@redhat.com> Fixes: 37e22164 ("tipc: rename and move message reassembly function") Signed-off-by:
Xin Long <lucien.xin@gmail.com> Signed-off-by:
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Tetsuo Handa authored
[ Upstream commit a4b5cc9e ] I confirmed that the problem fixed by commit 2a63866c ("tipc: fix shutdown() of connectionless socket") also applies to stream socket. ---------- #include <sys/socket.h> #include <unistd.h> #include <sys/wait.h> int main(int argc, char *argv[]) { int fds[2] = { -1, -1 }; socketpair(PF_TIPC, SOCK_STREAM /* or SOCK_DGRAM */, 0, fds); if (fork() == 0) _exit(read(fds[0], NULL, 1)); shutdown(fds[0], SHUT_RDWR); /* This must make read() return. */ wait(NULL); /* To be woken up by _exit(). */ return 0; } ---------- Since shutdown(SHUT_RDWR) should affect all processes sharing that socket, unconditionally setting sk->sk_shutdown to SHUTDOWN_MASK will be the right behavior. Signed-off-by:
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Acked-by:
Ying Xue <ying.xue@windriver.com> Signed-off-by:
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