aboutsummaryrefslogtreecommitdiffstats
path: root/fs/block_dev.c (unfollow)
AgeCommit message (Collapse)AuthorFilesLines
2019-05-01io_uring: drop req submit reference always in async puntJens Axboe1-3/+4
If we don't end up actually calling submit in io_sq_wq_submit_work(), we still need to drop the submit reference to the request. If we don't, then we can leak the request. This can happen if we race with ring shutdown while flushing the workqueue for requests that require use of the mm_struct. Fixes: e65ef56db494 ("io_uring: use regular request ref counts") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-05-01io_uring: free allocated io_memory onceMark Rutland1-8/+7
If io_allocate_scq_urings() fails to allocate an sq_* region, it will call io_mem_free() for any previously allocated regions, but leave dangling pointers to these regions in the ctx. Any regions which have not yet been allocated are left NULL. Note that when returning -EOVERFLOW, the previously allocated sq_ring is not freed, which appears to be an unintentional leak. When io_allocate_scq_urings() fails, io_uring_create() will call io_ring_ctx_wait_and_kill(), which calls io_mem_free() on all the sq_* regions, assuming the pointers are valid and not NULL. This can result in pages being freed multiple times, which has been observed to corrupt the page state, leading to subsequent fun. This can also result in virt_to_page() on NULL, resulting in the use of bogus page addresses, and yet more subsequent fun. The latter can be detected with CONFIG_DEBUG_VIRTUAL on arm64. Adding a cleanup path to io_allocate_scq_urings() complicates the logic, so let's leave it to io_ring_ctx_free() to consistently free these pointers, and simplify the io_allocate_scq_urings() error paths. Full splats from before this patch below. Note that the pointer logged by the DEBUG_VIRTUAL "non-linear address" warning has been hashed, and is actually NULL. [ 26.098129] page:ffff80000e949a00 count:0 mapcount:-128 mapping:0000000000000000 index:0x0 [ 26.102976] flags: 0x63fffc000000() [ 26.104373] raw: 000063fffc000000 ffff80000e86c188 ffff80000ea3df08 0000000000000000 [ 26.108917] raw: 0000000000000000 0000000000000001 00000000ffffff7f 0000000000000000 [ 26.137235] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 26.143960] ------------[ cut here ]------------ [ 26.146020] kernel BUG at include/linux/mm.h:547! [ 26.147586] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 26.149163] Modules linked in: [ 26.150287] Process syz-executor.21 (pid: 20204, stack limit = 0x000000000e9cefeb) [ 26.153307] CPU: 2 PID: 20204 Comm: syz-executor.21 Not tainted 5.1.0-rc7-00004-g7d30b2ea43d6 #18 [ 26.156566] Hardware name: linux,dummy-virt (DT) [ 26.158089] pstate: 40400005 (nZcv daif +PAN -UAO) [ 26.159869] pc : io_mem_free+0x9c/0xa8 [ 26.161436] lr : io_mem_free+0x9c/0xa8 [ 26.162720] sp : ffff000013003d60 [ 26.164048] x29: ffff000013003d60 x28: ffff800025048040 [ 26.165804] x27: 0000000000000000 x26: ffff800025048040 [ 26.167352] x25: 00000000000000c0 x24: ffff0000112c2820 [ 26.169682] x23: 0000000000000000 x22: 0000000020000080 [ 26.171899] x21: ffff80002143b418 x20: ffff80002143b400 [ 26.174236] x19: ffff80002143b280 x18: 0000000000000000 [ 26.176607] x17: 0000000000000000 x16: 0000000000000000 [ 26.178997] x15: 0000000000000000 x14: 0000000000000000 [ 26.181508] x13: 00009178a5e077b2 x12: 0000000000000001 [ 26.183863] x11: 0000000000000000 x10: 0000000000000980 [ 26.186437] x9 : ffff000013003a80 x8 : ffff800025048a20 [ 26.189006] x7 : ffff8000250481c0 x6 : ffff80002ffe9118 [ 26.191359] x5 : ffff80002ffe9118 x4 : 0000000000000000 [ 26.193863] x3 : ffff80002ffefe98 x2 : 44c06ddd107d1f00 [ 26.196642] x1 : 0000000000000000 x0 : 000000000000003e [ 26.198892] Call trace: [ 26.199893] io_mem_free+0x9c/0xa8 [ 26.201155] io_ring_ctx_wait_and_kill+0xec/0x180 [ 26.202688] io_uring_setup+0x6c4/0x6f0 [ 26.204091] __arm64_sys_io_uring_setup+0x18/0x20 [ 26.205576] el0_svc_common.constprop.0+0x7c/0xe8 [ 26.207186] el0_svc_handler+0x28/0x78 [ 26.208389] el0_svc+0x8/0xc [ 26.209408] Code: aa0203e0 d0006861 9133a021 97fcdc3c (d4210000) [ 26.211995] ---[ end trace bdb81cd43a21e50d ]--- [ 81.770626] ------------[ cut here ]------------ [ 81.825015] virt_to_phys used for non-linear address: 000000000d42f2c7 ( (null)) [ 81.827860] WARNING: CPU: 1 PID: 30171 at arch/arm64/mm/physaddr.c:15 __virt_to_phys+0x48/0x68 [ 81.831202] Modules linked in: [ 81.832212] CPU: 1 PID: 30171 Comm: syz-executor.20 Not tainted 5.1.0-rc7-00004-g7d30b2ea43d6 #19 [ 81.835616] Hardware name: linux,dummy-virt (DT) [ 81.836863] pstate: 60400005 (nZCv daif +PAN -UAO) [ 81.838727] pc : __virt_to_phys+0x48/0x68 [ 81.840572] lr : __virt_to_phys+0x48/0x68 [ 81.842264] sp : ffff80002cf67c70 [ 81.843858] x29: ffff80002cf67c70 x28: ffff800014358e18 [ 81.846463] x27: 0000000000000000 x26: 0000000020000080 [ 81.849148] x25: 0000000000000000 x24: ffff80001bb01f40 [ 81.851986] x23: ffff200011db06c8 x22: ffff2000127e3c60 [ 81.854351] x21: ffff800014358cc0 x20: ffff800014358d98 [ 81.856711] x19: 0000000000000000 x18: 0000000000000000 [ 81.859132] x17: 0000000000000000 x16: 0000000000000000 [ 81.861586] x15: 0000000000000000 x14: 0000000000000000 [ 81.863905] x13: 0000000000000000 x12: ffff1000037603e9 [ 81.866226] x11: 1ffff000037603e8 x10: 0000000000000980 [ 81.868776] x9 : ffff80002cf67840 x8 : ffff80001bb02920 [ 81.873272] x7 : ffff1000037603e9 x6 : ffff80001bb01f47 [ 81.875266] x5 : ffff1000037603e9 x4 : dfff200000000000 [ 81.876875] x3 : ffff200010087528 x2 : ffff1000059ecf58 [ 81.878751] x1 : 44c06ddd107d1f00 x0 : 0000000000000000 [ 81.880453] Call trace: [ 81.881164] __virt_to_phys+0x48/0x68 [ 81.882919] io_mem_free+0x18/0x110 [ 81.886585] io_ring_ctx_wait_and_kill+0x13c/0x1f0 [ 81.891212] io_uring_setup+0xa60/0xad0 [ 81.892881] __arm64_sys_io_uring_setup+0x2c/0x38 [ 81.894398] el0_svc_common.constprop.0+0xac/0x150 [ 81.896306] el0_svc_handler+0x34/0x88 [ 81.897744] el0_svc+0x8/0xc [ 81.898715] ---[ end trace b4a703802243cbba ]--- Fixes: 2b188cc1bb857a9d ("Add io_uring IO interface") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-block@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-05-01io_uring: fix SQPOLL cpu validationMark Rutland1-7/+3
In io_sq_offload_start(), we call cpu_possible() on an unbounded cpu value from userspace. On v5.1-rc7 on arm64 with CONFIG_DEBUG_PER_CPU_MAPS, this results in a splat: WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpu_max_bits_warn include/linux/cpumask.h:121 [inline] There was an attempt to fix this in commit: 917257daa0fea7a0 ("io_uring: only test SQPOLL cpu after we've verified it") ... by adding a check after the cpu value had been limited to NR_CPU_IDS using array_index_nospec(). However, this left an unbound check at the start of the function, for which the warning still fires. Let's fix this correctly by checking that the cpu value is bound by nr_cpu_ids before passing it to cpu_possible(). Note that only nr_cpu_ids of a cpumask are guaranteed to exist at runtime, and nr_cpu_ids can be significantly smaller than NR_CPUs. For example, an arm64 defconfig has NR_CPUS=256, while my test VM has 4 vCPUs. Following the intent from the commit message for 917257daa0fea7a0, the check is moved under the SQ_AFF branch, which is the only branch where the cpu values is consumed. The check is performed before bounding the value with array_index_nospec() so that we don't silently accept bogus cpu values from userspace, where array_index_nospec() would force these values to 0. I suspect we can remove the array_index_nospec() call entirely, but I've conservatively left that in place, updated to use nr_cpu_ids to match the prior check. Tested on arm64 with the Syzkaller reproducer: https://syzkaller.appspot.com/bug?extid=cd714a07c6de2bc34293 https://syzkaller.appspot.com/x/repro.syz?x=15d8b397200000 Full splat from before this patch: WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpu_max_bits_warn include/linux/cpumask.h:121 [inline] WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpumask_check include/linux/cpumask.h:128 [inline] WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpumask_test_cpu include/linux/cpumask.h:344 [inline] WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 io_sq_offload_start fs/io_uring.c:2244 [inline] WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 io_uring_create fs/io_uring.c:2864 [inline] WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 io_uring_setup+0x1108/0x15a0 fs/io_uring.c:2916 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 27601 Comm: syz-executor.0 Not tainted 5.1.0-rc7 #3 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x0/0x2f0 include/linux/compiler.h:193 show_stack+0x20/0x30 arch/arm64/kernel/traps.c:158 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x110/0x190 lib/dump_stack.c:113 panic+0x384/0x68c kernel/panic.c:214 __warn+0x2bc/0x2c0 kernel/panic.c:571 report_bug+0x228/0x2d8 lib/bug.c:186 bug_handler+0xa0/0x1a0 arch/arm64/kernel/traps.c:956 call_break_hook arch/arm64/kernel/debug-monitors.c:301 [inline] brk_handler+0x1d4/0x388 arch/arm64/kernel/debug-monitors.c:316 do_debug_exception+0x1a0/0x468 arch/arm64/mm/fault.c:831 el1_dbg+0x18/0x8c cpu_max_bits_warn include/linux/cpumask.h:121 [inline] cpumask_check include/linux/cpumask.h:128 [inline] cpumask_test_cpu include/linux/cpumask.h:344 [inline] io_sq_offload_start fs/io_uring.c:2244 [inline] io_uring_create fs/io_uring.c:2864 [inline] io_uring_setup+0x1108/0x15a0 fs/io_uring.c:2916 __do_sys_io_uring_setup fs/io_uring.c:2929 [inline] __se_sys_io_uring_setup fs/io_uring.c:2926 [inline] __arm64_sys_io_uring_setup+0x50/0x70 fs/io_uring.c:2926 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall arch/arm64/kernel/syscall.c:47 [inline] el0_svc_common.constprop.0+0x148/0x2e0 arch/arm64/kernel/syscall.c:83 el0_svc_handler+0xdc/0x100 arch/arm64/kernel/syscall.c:129 el0_svc+0x8/0xc arch/arm64/kernel/entry.S:948 SMP: stopping secondary CPUs Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled CPU features: 0x002,23000438 Memory Limit: none Rebooting in 1 seconds.. Fixes: 917257daa0fea7a0 ("io_uring: only test SQPOLL cpu after we've verified it") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-block@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Simplied the logic Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-05-01net: aquantia: remove outdated device idsNikita Danilov3-12/+0
Some device ids were never released and does not exist. Cleanup these. Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: fixups on 64bit dma countersDmitry Bogdanov6-64/+36
DMA counters are 64 bit and we can fetch that to reduce counter overflow, espesially on byte counters. Tested-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: get total counters from DMA blockDmitry Bogdanov1-4/+5
aq_nic_update_ndev_stats pushes statistics to ndev->stats from system interface. This is not always good because it counts packets/bytes before any of rx filters (including mac filter). Its better to report the packet/bytes statistics from DMA counters which gives actual values of data transferred over pci. System level stats is still available via ethtool. Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: fetch up to date statistics on ethtool requestDmitry Bogdanov1-1/+8
This improves ethtool -S usage, where stats are now actual on each request. Before that stats only were updated at service timer period. Tested-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: extract timer cb into work jobIgor Russkikh2-6/+20
Service timer callback fetches statistics from FW and that may cause a long delay in error cases. We also now need to use fw mutex to prevent concurrent access to FW, thus - extract that logic from timer callback into the job in the separate work queue. Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: introduce fwreq mutexNikita Danilov4-10/+42
Some of FW operations could be invoked simultaneously, from f.e. ethtool context and from service service activity work. Here we introduce a fw mutex to secure and serialize access to FW logic. Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: user correct MSI irq typeIgor Russkikh1-1/+1
Typo in msi code. No much impact though. Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: use macros for better visibilityIgor Russkikh2-8/+8
Improve for better readability Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: improve ifup link detectionIgor Russkikh1-2/+1
Original code detected link only after 1 sec is passed after up. Here we replace this with direct service callback which updates link status immediately Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: link status irq handlingIgor Russkikh4-19/+50
Here we define and request an extra interrupt line, assign it on link isr handler and restructure abit aq_pci code to better support that. We also remove logic for using different timer intervals depending on link state, since thats now useless. Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: create global service workqueueNikita Danilov4-1/+56
We need this to schedule link interrupt handling and various service tasks. Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: link interrupt handling functionIgor Russkikh1-0/+14
Define link interrupt handler Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: add link interrupt fieldsIgor Russkikh2-1/+4
Declare macroes and nic fields to support link interrupt handling Signed-off-by: Nikita Danilov <ndanilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: implement hwmon api for chip temperatureYana Esina4-0/+144
Added support for hwmon api to fetch out chip temperature Signed-off-by: Yana Esina <yana.esina@aquantia.com> Signed-off-by: Nikita Danilov <nikita.danilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01net: aquantia: add infrastructure to readout chip temperatureYana Esina3-0/+39
Ability to read the chip temperature from memory via hwmon interface Signed-off-by: Yana Esina <yana.esina@aquantia.com> Signed-off-by: Nikita Danilov <nikita.danilov@aquantia.com> Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01sctp: avoid running the sctp state machine recursivelyXin Long3-38/+27
Ying triggered a call trace when doing an asconf testing: BUG: scheduling while atomic: swapper/12/0/0x10000100 Call Trace: <IRQ> [<ffffffffa4375904>] dump_stack+0x19/0x1b [<ffffffffa436fcaf>] __schedule_bug+0x64/0x72 [<ffffffffa437b93a>] __schedule+0x9ba/0xa00 [<ffffffffa3cd5326>] __cond_resched+0x26/0x30 [<ffffffffa437bc4a>] _cond_resched+0x3a/0x50 [<ffffffffa3e22be8>] kmem_cache_alloc_node+0x38/0x200 [<ffffffffa423512d>] __alloc_skb+0x5d/0x2d0 [<ffffffffc0995320>] sctp_packet_transmit+0x610/0xa20 [sctp] [<ffffffffc098510e>] sctp_outq_flush+0x2ce/0xc00 [sctp] [<ffffffffc098646c>] sctp_outq_uncork+0x1c/0x20 [sctp] [<ffffffffc0977338>] sctp_cmd_interpreter.isra.22+0xc8/0x1460 [sctp] [<ffffffffc0976ad1>] sctp_do_sm+0xe1/0x350 [sctp] [<ffffffffc099443d>] sctp_primitive_ASCONF+0x3d/0x50 [sctp] [<ffffffffc0977384>] sctp_cmd_interpreter.isra.22+0x114/0x1460 [sctp] [<ffffffffc0976ad1>] sctp_do_sm+0xe1/0x350 [sctp] [<ffffffffc097b3a4>] sctp_assoc_bh_rcv+0xf4/0x1b0 [sctp] [<ffffffffc09840f1>] sctp_inq_push+0x51/0x70 [sctp] [<ffffffffc099732b>] sctp_rcv+0xa8b/0xbd0 [sctp] As it shows, the first sctp_do_sm() running under atomic context (NET_RX softirq) invoked sctp_primitive_ASCONF() that uses GFP_KERNEL flag later, and this flag is supposed to be used in non-atomic context only. Besides, sctp_do_sm() was called recursively, which is not expected. Vlad tried to fix this recursive call in Commit c0786693404c ("sctp: Fix oops when sending queued ASCONF chunks") by introducing a new command SCTP_CMD_SEND_NEXT_ASCONF. But it didn't work as this command is still used in the first sctp_do_sm() call, and sctp_primitive_ASCONF() will be called in this command again. To avoid calling sctp_do_sm() recursively, we send the next queued ASCONF not by sctp_primitive_ASCONF(), but by sctp_sf_do_prm_asconf() in the 1st sctp_do_sm() directly. Reported-by: Ying Xu <yinxu@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01stmmac: pci: Fix typo in IOT2000 commentJan Kiszka1-1/+1
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01Documentation: fix netdev-FAQ.rst markup warningRandy Dunlap1-1/+1
Fix ReST underline warning: ./Documentation/networking/netdev-FAQ.rst:135: WARNING: Title underline too short. Q: I made changes to only a few patches in a patch series should I resend only those changed? -------------------------------------------------------------------------------------------- Fixes: ffa91253739c ("Documentation: networking: Update netdev-FAQ regarding patches") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01io_uring: have submission side sqe errors post a cqeJens Axboe1-28/+6
Currently we only post a cqe if we get an error OUTSIDE of submission. For submission, we return the error directly through io_uring_enter(). This is a bit awkward for applications, and it makes more sense to always post a cqe with an error, if the error happens on behalf of an sqe. This changes submission behavior a bit. io_uring_enter() returns -ERROR for an error, and > 0 for number of sqes submitted. Before this change, if you wanted to submit 8 entries and had an error on the 5th entry, io_uring_enter() would return 4 (for number of entries successfully submitted) and rewind the sqring. The application would then have to peek at the sqring and figure out what was wrong with the head sqe, and then skip it itself. With this change, we'll return 5 since we did consume 5 sqes, and the last sqe (with the error) will result in a cqe being posted with the error. This makes the logic easier to handle in the application, and it cleans up the submission part. Suggested-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-04-30ipv6: fix races in ip6_dst_destroy()Eric Dumazet2-10/+3
We had many syzbot reports that seem to be caused by use-after-free of struct fib6_info. ip6_dst_destroy(), fib6_drop_pcpu_from() and rt6_remove_exception() are writers vs rt->from, and use non consistent synchronization among themselves. Switching to xchg() will solve the issues with no possible lockdep issues. BUG: KASAN: user-memory-access in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:747 [inline] BUG: KASAN: user-memory-access in fib6_info_release include/net/ip6_fib.h:294 [inline] BUG: KASAN: user-memory-access in fib6_info_release include/net/ip6_fib.h:292 [inline] BUG: KASAN: user-memory-access in fib6_drop_pcpu_from net/ipv6/ip6_fib.c:927 [inline] BUG: KASAN: user-memory-access in fib6_purge_rt+0x4f6/0x670 net/ipv6/ip6_fib.c:960 Write of size 4 at addr 0000000000ffffb4 by task syz-executor.1/7649 CPU: 0 PID: 7649 Comm: syz-executor.1 Not tainted 5.1.0-rc6+ #183 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+0x172/0x1f0 lib/dump_stack.c:113 kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_write+0x14/0x20 mm/kasan/common.c:108 atomic_dec_and_test include/asm-generic/atomic-instrumented.h:747 [inline] fib6_info_release include/net/ip6_fib.h:294 [inline] fib6_info_release include/net/ip6_fib.h:292 [inline] fib6_drop_pcpu_from net/ipv6/ip6_fib.c:927 [inline] fib6_purge_rt+0x4f6/0x670 net/ipv6/ip6_fib.c:960 fib6_del_route net/ipv6/ip6_fib.c:1813 [inline] fib6_del+0xac2/0x10a0 net/ipv6/ip6_fib.c:1844 fib6_clean_node+0x3a8/0x590 net/ipv6/ip6_fib.c:2006 fib6_walk_continue+0x495/0x900 net/ipv6/ip6_fib.c:1928 fib6_walk+0x9d/0x100 net/ipv6/ip6_fib.c:1976 fib6_clean_tree+0xe0/0x120 net/ipv6/ip6_fib.c:2055 __fib6_clean_all+0x118/0x2a0 net/ipv6/ip6_fib.c:2071 fib6_clean_all+0x2b/0x40 net/ipv6/ip6_fib.c:2082 rt6_sync_down_dev+0x134/0x150 net/ipv6/route.c:4057 rt6_disable_ip+0x27/0x5f0 net/ipv6/route.c:4062 addrconf_ifdown+0xa2/0x1220 net/ipv6/addrconf.c:3705 addrconf_notify+0x19a/0x2260 net/ipv6/addrconf.c:3630 notifier_call_chain+0xc7/0x240 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1753 call_netdevice_notifiers_extack net/core/dev.c:1765 [inline] call_netdevice_notifiers net/core/dev.c:1779 [inline] dev_close_many+0x33f/0x6f0 net/core/dev.c:1522 rollback_registered_many+0x43b/0xfd0 net/core/dev.c:8177 rollback_registered+0x109/0x1d0 net/core/dev.c:8242 unregister_netdevice_queue net/core/dev.c:9289 [inline] unregister_netdevice_queue+0x1ee/0x2c0 net/core/dev.c:9282 unregister_netdevice include/linux/netdevice.h:2658 [inline] __tun_detach+0xd5b/0x1000 drivers/net/tun.c:727 tun_detach drivers/net/tun.c:744 [inline] tun_chr_close+0xe0/0x180 drivers/net/tun.c:3443 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 __do_sys_exit_group kernel/exit.c:991 [inline] __se_sys_exit_group kernel/exit.c:989 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:989 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffeafc2a6a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001c RCX: 0000000000458da9 RDX: 0000000000412a80 RSI: 0000000000a54ef0 RDI: 0000000000000043 RBP: 00000000004be552 R08: 000000000000000c R09: 000000000004c0d1 R10: 0000000002341940 R11: 0000000000000246 R12: 00000000ffffffff R13: 00007ffeafc2a7f0 R14: 000000000004c065 R15: 00007ffeafc2a800 Fixes: a68886a69180 ("net/ipv6: Make from in rt6_info rcu protected") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Cc: David Ahern <dsahern@gmail.com> Reviewed-by: David Ahern <dsahern@gmail.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Wei Wang <weiwan@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30r8169: remove manual autoneg restart workaroundHeiner Kallweit1-8/+0
According to Neil who reported the issue leading to this workaround, the workaround is no longer needed since version 5.0. So let's remove it. This was the bug report leading to the workaround: https://bugzilla.kernel.org/show_bug.cgi?id=201081 Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Tested-by: Neil MacLeod <neil@nmacleod.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30r8169: add rtl_reset_packet_filterHeiner Kallweit1-13/+12
Fortunately in one place there's a comment explaining what toggling this bit does. So let's create a helper for it. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30r8169: add helpers rtl_eri_set/clear_bitsHeiner Kallweit1-36/+40
Add helpers rtl_eri_set_bits and rtl_eri_clear_bits to improve readability of the code. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30r8169: make ERIAR_EXGMAC the default in eri functionsHeiner Kallweit1-114/+108
In basically all eri function calls the type argument is ERIAR_EXGMAC. Therefore make it the default. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30dt-bindings: net: DSA: Remove legacy bindingAndrew Lunn1-155/+0
Now that the code to support the legacy binding has been removed, remove the documentation for it. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Remove legacy probing supportAndrew Lunn6-797/+0
Now that all drivers can be probed using more traditional methods, remove the legacy probe code. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: mv88e6060: Remove support for legacy probingAndrew Lunn2-40/+2
Now that the driver can be probed as an mdio device, remove the legacy DSA platform device probing. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: mv88e6060: Support probing as an mdio deviceAndrew Lunn1-1/+58
Probing DSA devices as platform devices has been superseded by using normal bus drivers. Add support for probing the mv88e6060 device as an mdio device. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Add more convenient functions for installing port VLANsVladimir Oltean3-21/+36
This hides the need to perform a two-phase transaction and construct a switchdev_obj_port_vlan struct. Call graph (including a function that will be introduced in a follow-up patch) looks like this now (same for the *_vlan_del function): dsa_slave_vlan_rx_add_vid dsa_port_setup_8021q_tagging | | | | | +-------------+ | | v v dsa_port_vid_add dsa_slave_port_obj_add | | +-------+ +-------+ | | v v dsa_port_vlan_add Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: b53: Use vlan_filtering property from dsa_switchVladimir Oltean2-4/+2
While possible (and safe) to use the newly introduced dsa_port_is_vlan_filtering helper, fabricating a dsa_port pointer is a bit awkward, so simply retrieve this from the dsa_switch structure. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: b53: Let DSA call .port_vlan_filtering only when necessaryVladimir Oltean1-2/+2
Since DSA has recently learned to treat better with drivers that set vlan_filtering_is_global, doing this is no longer required. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Skip calling .port_vlan_filtering on no changeVladimir Oltean1-0/+3
Even if VLAN filtering is global, DSA will call this callback once per each port. Drivers should not have to compare the global state with the requested change. So let DSA do it. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: mt7530: Use the DSA vlan_filtering helper functionVladimir Oltean2-12/+5
This was recently introduced, so keeping state inside the driver is no longer necessary. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Suggested-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Add helper function to retrieve VLAN awareness settingVladimir Oltean1-0/+10
Since different types of hardware may or may not support this setting per-port, DSA keeps it either in dsa_switch or in dsa_port. While drivers may know the characteristics of their hardware and retrieve it from the correct place without the need of helpers, it is cumbersone to find out an unambigous answer from generic DSA code. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Keep the vlan_filtering setting in dsa_switch if it's globalVladimir Oltean2-1/+9
The current behavior is not as obvious as one would assume (which is that, if the driver set vlan_filtering_is_global = 1, then checking any dp->vlan_filtering would yield the same result). Only the ports which are actively enslaved into a bridge would have vlan_filtering set. This makes it tricky for drivers to check what the global state is. So fix this and make the struct dsa_switch hold this global setting. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: mt7530: Let DSA handle the unsetting of vlan_filteringVladimir Oltean1-2/+2
The driver, recognizing that the .port_vlan_filtering callback was never coming after the port left its parent bridge, decided to take that duty in its own hands. DSA now takes care of this condition, so fix that. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Unset vlan_filtering when ports leave the bridgeVladimir Oltean1-0/+29
When ports are standalone (after they left the bridge), they should have no VLAN filtering semantics (they should pass all traffic to the CPU). Currently this is not true for switchdev drivers, because the bridge "forgets" to unset that. Normally one would think that doing this at the bridge layer would be a better idea, i.e. call br_vlan_filter_toggle() from br_del_if(), similar to how nbp_vlan_init() is called from br_add_if(). However what complicates that approach, and makes this one preferable, is the fact that for the bridge core, vlan_filtering is a per-bridge setting, whereas for switchdev/DSA it is per-port. Also there are switches where the setting is per the entire device, and unsetting vlan_filtering one by one, for each leaving port, would not be possible from the bridge core without a certain level of awareness. So do this in DSA and let drivers be unaware of it. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: b53: Let DSA handle mismatched VLAN filtering settingsVladimir Oltean1-18/+7
The DSA core is now able to do this check prior to calling the .port_vlan_filtering callback, so tell it that VLAN filtering is global for this particular hardware. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Suggested-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Be aware of switches where VLAN filtering is a global settingVladimir Oltean2-7/+50
On some switches, the action of whether to parse VLAN frame headers and use that information for ingress admission is configurable, but not per port. Such is the case for the Broadcom BCM53xx and the NXP SJA1105 families, for example. In that case, DSA can prevent the bridge core from trying to apply different VLAN filtering settings on net devices that belong to the same switch. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Suggested-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Store vlan_filtering as a property of dsa_portVladimir Oltean2-4/+9
This allows drivers to query the VLAN setting imposed by the bridge driver directly from DSA, instead of keeping their own state based on the .port_vlan_filtering callback. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30net: dsa: Fix pharse -> phase typoVladimir Oltean1-1/+1
Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-30Revert "ACPICA: Clear status of GPEs before enabling them"Rafael J. Wysocki1-5/+1
Revert commit c8b1917c8987 ("ACPICA: Clear status of GPEs before enabling them") that causes problems with Thunderbolt controllers to occur if a dock device is connected at init time (the xhci_hcd and thunderbolt modules crash which prevents peripherals connected through them from working). Commit c8b1917c8987 effectively causes commit ecc1165b8b74 ("ACPICA: Dispatch active GPEs at init time") to get undone, so the problem addressed by commit ecc1165b8b74 appears again as a result of it. Fixes: c8b1917c8987 ("ACPICA: Clear status of GPEs before enabling them") Link: https://lore.kernel.org/lkml/s5hy33siofw.wl-tiwai@suse.de/T/#u Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1132943 Reported-by: Michael Hirmke <opensuse@mike.franken.de> Reported-by: Takashi Iwai <tiwai@suse.de> Cc: 4.17+ <stable@vger.kernel.org> # 4.17+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-04-30io_uring: remove unnecessary barrier after unsetting IORING_SQ_NEED_WAKEUPStefan Bühler1-2/+0
There is no operation to order with afterwards, and removing the flag is not critical in any way. There will always be a "race condition" where the application will trigger IORING_ENTER_SQ_WAKEUP when it isn't actually needed. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-04-30io_uring: remove unnecessary barrier after incrementing dropped counterStefan Bühler1-2/+0
smp_store_release in io_commit_sqring already orders the store to dropped before the update to SQ head. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-04-30io_uring: remove unnecessary barrier before reading SQ tailStefan Bühler1-2/+0
There is no operation before to order with. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-04-30io_uring: remove unnecessary barrier after updating SQ headStefan Bühler1-6/+0
There is no operation afterwards to order with. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-04-30io_uring: remove unnecessary barrier before reading cq headStefan Bühler1-2/+5
The memory operations before reading cq head are unrelated and we don't care about their order. Document that the control dependency in combination with READ_ONCE and WRITE_ONCE forms a barrier we need. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.