- 28 Feb, 2020 1 commit
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Andy Lutomirski authored
CVE-2020-2732 commit a582c540 upstream. RDPID is a new instruction that reads MSR_TSC_AUX quickly. This should be considerably faster than reading the GDT. Add a cpufeature for it and use it from __vdso_getcpu() when available. Tested-by:
Megha Dey <megha.dey@intel.com> Signed-off-by:
Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/4f6c3a22012d10f1c65b9ca15800e01b42c7d39d.1479320367.git.luto@kernel.orgSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Acked-by:
Benjamin M Romer <benjamin.romer@canonical.com> Acked-by:
Khalid Elmously <khalid.elmously@canonical.com> Signed-off-by:
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- 14 Feb, 2020 5 commits
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Marcelo Henrique Cerri authored
Signed-off-by:Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
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Marcelo Henrique Cerri authored
BugLink: https://bugs.launchpad.net/bugs/1863338 Properties: no-test-build Signed-off-by:
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Marcelo Henrique Cerri authored
Ignore: yes Signed-off-by: -
Seth Forshee authored
BugLink: https://bugs.launchpad.net/bugs/1861973 Debian source package diffs cannot represent that a file should be executable. This is a problem for us if a patch adds a script which is invoked directly during the build, as happened with a recent stable update for 4.14. Update gen-auto-reconstruct to detect this situation and restore the execute permissions in the reconstruct script. Exclude the debian packaging directories as the scripts here already account for the loss of execute permissions. Signed-off-by:
Seth Forshee <seth.foddrshee@canonical.com> Signed-off-by:
Po-Hsu Lin <po-hsu.lin@canonical.com> Acked-by:
Kleber Sacilotto de Souza <kleber.souza@canonical.com> Signed-off-by:
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Richard Palethorpe authored
BugLink: https://bugs.launchpad.net/bugs/1862114 write_wakeup can happen in parallel with close/hangup where tty->disc_data is set to NULL and the netdevice is freed thus also freeing disc_data. write_wakeup accesses disc_data so we must prevent close from freeing the netdev while write_wakeup has a non-NULL view of tty->disc_data. We also need to make sure that accesses to disc_data are atomic. Which can all be done with RCU. This problem was found by Syzkaller on SLCAN, but the same issue is reproducible with the SLIP line discipline using an LTP test based on the Syzkaller reproducer. A fix which didn't use RCU was posted by Hillf Danton. Fixes: 661f7fda ("slip: Fix deadlock in write_wakeup") Fixes: a8e83b17 ("slcan: Port write_wakeup deadlock fix from slip") Reported-by: syzbot+017e491ae13c0068598a@syzkaller.appspotmail.com Signed-off-by:
Richard Palethorpe <rpalethorpe@suse.com> Cc: Wolfgang Grandegger <wg@grandegger.com> Cc: Marc Kleine-Budde <mkl@pengutronix.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: Tyler Hall <tylerwhall@gmail.com> Cc: linux-can@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com Signed-off-by:
David S. Miller <davem@davemloft.net> (cherry picked from commit 0ace17d5) Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
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- 29 Jan, 2020 34 commits
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Khalid Elmously authored
Signed-off-by: -
Khalid Elmously authored
BugLink: https://bugs.launchpad.net/bugs/1861122 Properties: no-test-build Signed-off-by:
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Khalid Elmously authored
Ignore: yes Signed-off-by: -
Connor Kuehl authored
BugLink: https://bugs.launchpad.net/bugs/1860681 Ignore: yes Signed-off-by:
Connor Kuehl <connor.kuehl@canonical.com> Signed-off-by:
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Greg Kroah-Hartman authored
BugLink: https://bugs.launchpad.net/bugs/1860681Signed-off-by:
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Stephan Gerhold authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 458ea3ad upstream. Those regulators are not actually supported by the AB8500 regulator driver. There is no ab8500_regulator_info for them and no entry in ab8505_regulator_match. As such, they cannot be registered successfully, and looking them up in ab8505_regulator_match causes an out-of-bounds array read. Fixes: 547f384f ("regulator: ab8500: add support for ab8505") Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Stephan Gerhold <stephan@gerhold.net> Reviewed-by:
Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20191106173125.14496-2-stephan@gerhold.netSigned-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Masami Hiramatsu authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 07d36985 upstream. Since there are some DIE which has only ranges instead of the combination of entrypc/highpc, address verification must use dwarf_haspc() instead of dwarf_entrypc/dwarf_highpc. Also, the ranges only DIE will have a partial code in different section (e.g. unlikely code will be in text.unlikely as "FUNC.cold" symbol). In that case, we can not use dwarf_entrypc() or die_entrypc(), because the offset from original DIE can be a minus value. Instead, this simply gets the symbol and offset from symtab. Without this patch; # perf probe -D clear_tasks_mm_cpumask:1 Failed to get entry address of clear_tasks_mm_cpumask Error: Failed to add events. And with this patch: # perf probe -D clear_tasks_mm_cpumask:1 p:probe/clear_tasks_mm_cpumask clear_tasks_mm_cpumask+0 p:probe/clear_tasks_mm_cpumask_1 clear_tasks_mm_cpumask+5 p:probe/clear_tasks_mm_cpumask_2 clear_tasks_mm_cpumask+8 p:probe/clear_tasks_mm_cpumask_3 clear_tasks_mm_cpumask+16 p:probe/clear_tasks_mm_cpumask_4 clear_tasks_mm_cpumask+82 Committer testing: I managed to reproduce the above: [root@quaco ~]# perf probe -D clear_tasks_mm_cpumask:1 p:probe/clear_tasks_mm_cpumask _text+919968 p:probe/clear_tasks_mm_cpumask_1 _text+919973 p:probe/clear_tasks_mm_cpumask_2 _text+919976 [root@quaco ~]# But then when trying to actually put the probe in place, it fails if I use :0 as the offset: [root@quaco ~]# perf probe -L clear_tasks_mm_cpumask | head -5 <clear_tasks_mm_cpumask@/usr/src/debug/kernel-5.2.fc30/linux-5.2.18-200.fc30.x86_64/kernel/cpu.c:0> 0 void clear_tasks_mm_cpumask(int cpu) 1 { 2 struct task_struct *p; [root@quaco ~]# perf probe clear_tasks_mm_cpumask:0 Probe point 'clear_tasks_mm_cpumask' not found. Error: Failed to add events. [root@quaco The next patch is needed to fix this case. Fixes: 576b5237 ("perf probe: Fix probing symbols with optimization suffix") Reported-by:
Arnaldo Carvalho de Melo <acme@kernel.org> Tested-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lore.kernel.org/lkml/157199318513.8075.10463906803299647907.stgit@devnote2Signed-off-by:
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Bart Van Assche authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit b1335f5b upstream. This patch fixes an unintended sign extension on left shifts. From Colin King: "Shifting a u8 left will cause the value to be promoted to an integer. If the top bit of the u8 is set then the following conversion to an u64 will sign extend the value causing the upper 32 bits to be set in the result." Fix this by using get_unaligned_be*() instead. Fixes: bf816235 ("[SCSI] add scsi trace core functions and put trace points") Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: Douglas Gilbert <dgilbert@interlog.com> Link: https://lore.kernel.org/r/20191101211447.187151-1-bvanassche@acm.orgReported-by:
Bart Van Assche <bvanassche@acm.org> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
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Bart Van Assche authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit c941e0d1 upstream. Print the string for which conversion failed instead of printing the function name twice. Fixes: 2650d71e ("target: move transport ID handling to the core") Cc: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20191107215525.64415-1-bvanassche@acm.orgSigned-off-by:
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Pan Bian authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 29d28f2b upstream. The member hba->pcidev may be used after its reference is dropped. Move the put function to where it is never used to avoid potential use after free issues. Fixes: a7717180 ("[SCSI] bnx2i: Removed the reference to the netdev->base_addr") Link: https://lore.kernel.org/r/1573043541-19126-1-git-send-email-bianpan2016@163.comSigned-off-by:
Pan Bian <bianpan2016@163.com> Signed-off-by:
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Pan Bian authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 3fe3d242 upstream. The variable init_fw_cb is released twice, resulting in a double free bug. The call to the function dma_free_coherent() before goto is removed to get rid of potential double free. Fixes: 2a49a78e ("[SCSI] qla4xxx: added IPv6 support.") Link: https://lore.kernel.org/r/1572945927-27796-1-git-send-email-bianpan2016@163.comSigned-off-by:
Manish Rangankar <mrangankar@marvell.com> Signed-off-by:
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Dan Carpenter authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 906ca635 upstream. This error path is missing an unlock. Fixes: 26780d9e ("[SCSI] esas2r: ATTO Technology ExpressSAS 6G SAS/SATA RAID Adapter Driver") Link: https://lore.kernel.org/r/20191022102324.GA27540@mwandaSigned-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Johannes Berg authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 24953de0 upstream. Check if set_wiphy_params is assigned and return an error if not, some drivers (e.g. virt_wifi where syzbot reported it) don't have it. Reported-by: syzbot+e8a797964a4180eb57d5@syzkaller.appspotmail.com Reported-by: syzbot+34b582cf32c1db008f8e@syzkaller.appspotmail.com Signed-off-by:
Johannes Berg <johannes.berg@intel.com> Link: https://lore.kernel.org/r/20200113125358.ac07f276efff.Ibd85ee1b12e47b9efb00a2adc5cd3fac50da791a@changeidSigned-off-by:
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Dan Carpenter authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 4a50d454 upstream. The "priv->hw_type" is an enum and in this context GCC will treat it as an unsigned int so the error handling will never trigger. Fixes: a910e4a9 ("cw1200: add driver for the ST-E CW1100 & CW1200 WLAN chipsets") Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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Nathan Chancellor authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 589b7289 upstream. Clang warns: ../drivers/block/xen-blkfront.c:1117:4: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation] nr_parts = PARTS_PER_DISK; ^ ../drivers/block/xen-blkfront.c:1115:3: note: previous statement is here if (err) ^ This is because there is a space at the beginning of this line; remove it so that the indentation is consistent according to the Linux kernel coding style and clang no longer warns. While we are here, the previous line has some trailing whitespace; clean that up as well. Fixes: c80a4209 ("xen-blkfront: handle Xen major numbers other than XENVBD") Link: https://github.com/ClangBuiltLinux/linux/issues/791Signed-off-by:
Nathan Chancellor <natechancellor@gmail.com> Reviewed-by:
Juergen Gross <jgross@suse.com> Acked-by:
Roger Pau Monné <roger.pau@citrix.com> Signed-off-by:
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Eric Dumazet authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit f8d7408a ] lan78xx_tx_bh() makes sure to not exceed MAX_SINGLE_PACKET_SIZE bytes in the aggregated packets it builds, but does nothing to prevent large GSO packets being submitted. Pierre-Francois reported various hangs when/if TSO is enabled. For localy generated packets, we can use netif_set_gso_max_size() to limit the size of TSO packets. Note that forwarded packets could still hit the issue, so a complete fix might require implementing .ndo_features_check for this driver, forcing a software segmentation if the size of the TSO packet exceeds MAX_SINGLE_PACKET_SIZE. Fixes: 55d7de9d ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver") Signed-off-by:
Eric Dumazet <edumazet@google.com> Reported-by:
RENARD Pierre-Francois <pfrenard@gmail.com> Tested-by:
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Pengcheng Yang authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit e176b1ba ] When the packet pointed to by retransmit_skb_hint is unlinked by ACK, retransmit_skb_hint will be set to NULL in tcp_clean_rtx_queue(). If packet loss is detected at this time, retransmit_skb_hint will be set to point to the current packet loss in tcp_verify_retransmit_hint(), then the packets that were previously marked lost but not retransmitted due to the restriction of cwnd will be skipped and cannot be retransmitted. To fix this, when retransmit_skb_hint is NULL, retransmit_skb_hint can be reset only after all marked lost packets are retransmitted (retrans_out >= lost_out), otherwise we need to traverse from tcp_rtx_queue_head in tcp_xmit_retransmit_queue(). Packetdrill to demonstrate: // Disable RACK and set max_reordering to keep things simple 0 `sysctl -q net.ipv4.tcp_recovery=0` +0 `sysctl -q net.ipv4.tcp_max_reordering=3` // Establish a connection +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0 bind(3, ..., ...) = 0 +0 listen(3, 1) = 0 +.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> +0 > S. 0:0(0) ack 1 <...> +.01 < . 1:1(0) ack 1 win 257 +0 accept(3, ..., ...) = 4 // Send 8 data segments +0 write(4, ..., 8000) = 8000 +0 > P. 1:8001(8000) ack 1 // Enter recovery and 1:3001 is marked lost +.01 < . 1:1(0) ack 1 win 257 <sack 3001:4001,nop,nop> +0 < . 1:1(0) ack 1 win 257 <sack 5001:6001 3001:4001,nop,nop> +0 < . 1:1(0) ack 1 win 257 <sack 5001:7001 3001:4001,nop,nop> // Retransmit 1:1001, now retransmit_skb_hint points to 1001:2001 +0 > . 1:1001(1000) ack 1 // 1001:2001 was ACKed causing retransmit_skb_hint to be set to NULL +.01 < . 1:1(0) ack 2001 win 257 <sack 5001:8001 3001:4001,nop,nop> // Now retransmit_skb_hint points to 4001:5001 which is now marked lost // BUG: 2001:3001 was not retransmitted +0 > . 2001:3001(1000) ack 1 Signed-off-by:
Pengcheng Yang <yangpc@wangsu.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Tested-by:
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Johan Hovold authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit 86f3f4cd ] Add missing endpoint sanity check to probe in order to prevent a NULL-pointer dereference (or slab out-of-bounds access) when retrieving the interrupt-endpoint bInterval on ndo_open() in case a device lacks the expected endpoints. Fixes: 40a82917 ("net/usb/r8152: enable interrupt transfer") Cc: hayeswang <hayeswang@realtek.com> Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
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Eric Dumazet authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit 1712b2ff ] I missed the fact that macvlan_broadcast() can be used both in RX and TX. skb_eth_hdr() makes only sense in TX paths, so we can not use it blindly in macvlan_broadcast() Fixes: 96cc4b69 ("macvlan: do not assume mac_header is set in macvlan_broadcast()") Signed-off-by:
Jurgen Van Ham <juvanham@gmail.com> Tested-by:
Matteo Croce <mcroce@redhat.com> Signed-off-by:
Sasha Levin <sashal@kernel.org> Signed-off-by:
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Sven Eckelmann authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 4cc4a170 upstream. The distributed arp table is using a DHT to store and retrieve MAC address information for an IP address. This is done using unicast messages to selected peers. The potential peers are looked up using the IP address and the VID. While the IP address is always stored in big endian byte order, this is not the case of the VID. It can (depending on the host system) either be big endian or little endian. The host must therefore always convert it to big endian to ensure that all devices calculate the same peers for the same lookup data. Fixes: be1db4f6 ("batman-adv: make the Distributed ARP Table vlan aware") Signed-off-by:
Sven Eckelmann <sven@narfation.org> Signed-off-by:
Simon Wunderlich <sw@simonwunderlich.de> Signed-off-by:
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Cong Wang authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit c1209593 upstream. map->members is freed by ip_set_free() right before using it in mtype_ext_cleanup() again. So we just have to move it down. Reported-by: syzbot+4c3cc6dbe7259dbf9054@syzkaller.appspotmail.com Fixes: 40cd63bf ("netfilter: ipset: Support extensions which need a per data destroy function") Acked-by:
Jozsef Kadlecsik <kadlec@netfilter.org> Signed-off-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by:
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Dinh Nguyen authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit 210de0e9 ] Fix up the correct interrupt numbers for the PMU unit on Agilex and Stratix10. Fixes: 78cd6a9d ("arm64: dts: Add base stratix 10 dtsi") Cc: linux-stable <stable@vger.kernel.org> Reported-by:
Meng Li <Meng.Li@windriver.com> Signed-off-by:
Dinh Nguyen <dinguyen@kernel.org> Signed-off-by:
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Arnd Bergmann authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit 42ec15ce ] gcc -O3 warns that some local variables are not properly initialized: drivers/scsi/fnic/vnic_dev.c: In function 'fnic_dev_hang_notify': drivers/scsi/fnic/vnic_dev.c:511:16: error: 'a0' is used uninitialized in this function [-Werror=uninitialized] vdev->args[0] = *a0; ~~~~~~~~~~~~~~^~~~~ drivers/scsi/fnic/vnic_dev.c:691:6: note: 'a0' was declared here u64 a0, a1; ^~ drivers/scsi/fnic/vnic_dev.c:512:16: error: 'a1' is used uninitialized in this function [-Werror=uninitialized] vdev->args[1] = *a1; ~~~~~~~~~~~~~~^~~~~ drivers/scsi/fnic/vnic_dev.c:691:10: note: 'a1' was declared here u64 a0, a1; ^~ drivers/scsi/fnic/vnic_dev.c: In function 'fnic_dev_mac_addr': drivers/scsi/fnic/vnic_dev.c:512:16: error: 'a1' is used uninitialized in this function [-Werror=uninitialized] vdev->args[1] = *a1; ~~~~~~~~~~~~~~^~~~~ drivers/scsi/fnic/vnic_dev.c:698:10: note: 'a1' was declared here u64 a0, a1; ^~ Apparently the code relies on the local variables occupying adjacent memory locations in the same order, but this is of course not guaranteed. Use an array of two u64 variables where needed to make it work correctly. I suspect there is also an endianness bug here, but have not digged in deep enough to be sure. Fixes: 5df6d737 ("[SCSI] fnic: Add new Cisco PCI-Express FCoE HBA") Fixes: mmtom ("init/Kconfig: enable -O3 for all arches") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200107201602.4096790-1-arnd@arndb.deSigned-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Andy Shevchenko authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit 36fe90b0 ] Instead of supplying each byte through stack let's use %pM specifier. Cc: Hiral Patel <hiralpat@cisco.com> Cc: Suma Ramars <sramars@cisco.com> Acked-by:
Tom Tucker <tom@opengridcomputing.com> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by:
Ewan D. Milne <emilne@redhat.com> Signed-off-by:
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Johan Hovold authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit 3018dd3f ] Check for NULL port data in the control URB completion handlers to avoid dereferencing a NULL pointer in the unlikely case where a port device isn't bound to a driver (e.g. after an allocation failure on port probe()). Fixes: 0ca1268e ("USB Serial Keyspan: add support for USA-49WG & USA-28XG") Fixes: 1da177e4 ("Linux-2.6.12-rc2") Cc: stable <stable@vger.kernel.org> Reviewed-by:
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Johan Hovold authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit e37d1aed ] Check for NULL port data in the shared interrupt and bulk completion callbacks to avoid dereferencing a NULL pointer in case a device sends data for a port device which isn't bound to a driver (e.g. due to a malicious device having unexpected endpoints or after an allocation failure on port probe). Fixes: 1da177e4 ("Linux-2.6.12-rc2") Cc: stable <stable@vger.kernel.org> Reviewed-by:
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John Ogness authored
BugLink: https://bugs.launchpad.net/bugs/1860681 [ Upstream commit dd1fae52 ] The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives. Signed-off-by:
John Ogness <john.ogness@linutronix.de> Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
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Jose Abreu authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit b2f3a481 upstream. XGMAC supports maximum MTU that can go to 16KB. Lets add this check in the calculation of RX buffer size. Fixes: 7ac6653a ("stmmac: Move the STMicroelectronics driver") Signed-off-by:
Jose Abreu <Jose.Abreu@synopsys.com> Signed-off-by:
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Jose Abreu authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 86051317 upstream. The 16KB RX Buffer must also be 16 byte aligned. Fix it. Fixes: 7ac6653a ("stmmac: Move the STMicroelectronics driver") Signed-off-by:
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Wen Yang authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 6d9e8c65 upstream. Patch series "use div64_ul() instead of div_u64() if the divisor is unsigned long". We were first inspired by commit b0ab99e7 ("sched: Fix possible divide by zero in avg_atom () calculation"), then refer to the recently analyzed mm code, we found this suspicious place. 201 if (min) { 202 min *= this_bw; 203 do_div(min, tot_bw); 204 } And we also disassembled and confirmed it: /usr/src/debug/kernel-4.9.168-016.ali3000/linux-4.9.168-016.ali3000.alios7.x86_64/mm/page-writeback.c: 201 0xffffffff811c37da <__wb_calc_thresh+234>: xor %r10d,%r10d 0xffffffff811c37dd <__wb_calc_thresh+237>: test %rax,%rax 0xffffffff811c37e0 <__wb_calc_thresh+240>: je 0xffffffff811c3800 <__wb_calc_thresh+272> /usr/src/debug/kernel-4.9.168-016.ali3000/linux-4.9.168-016.ali3000.alios7.x86_64/mm/page-writeback.c: 202 0xffffffff811c37e2 <__wb_calc_thresh+242>: imul %r8,%rax /usr/src/debug/kernel-4.9.168-016.ali3000/linux-4.9.168-016.ali3000.alios7.x86_64/mm/page-writeback.c: 203 0xffffffff811c37e6 <__wb_calc_thresh+246>: mov %r9d,%r10d ---> truncates it to 32 bits here 0xffffffff811c37e9 <__wb_calc_thresh+249>: xor %edx,%edx 0xffffffff811c37eb <__wb_calc_thresh+251>: div %r10 0xffffffff811c37ee <__wb_calc_thresh+254>: imul %rbx,%rax 0xffffffff811c37f2 <__wb_calc_thresh+258>: shr $0x2,%rax 0xffffffff811c37f6 <__wb_calc_thresh+262>: mul %rcx 0xffffffff811c37f9 <__wb_calc_thresh+265>: shr $0x2,%rdx 0xffffffff811c37fd <__wb_calc_thresh+269>: mov %rdx,%r10 This series uses div64_ul() instead of div_u64() if the divisor is unsigned long, to avoid truncation to 32-bit on 64-bit platforms. This patch (of 3): The variables 'min' and 'max' are unsigned long and do_div truncates them to 32 bits, which means it can test non-zero and be truncated to zero for division. Fix this issue by using div64_ul() instead. Link: http://lkml.kernel.org/r/20200102081442.8273-2-wenyang@linux.alibaba.com Fixes: 693108a8 ("writeback: make bdi->min/max_ratio handling cgroup writeback aware") Signed-off-by:
Wen Yang <wenyang@linux.alibaba.com> Reviewed-by:
Andrew Morton <akpm@linux-foundation.org> Cc: Qian Cai <cai@lca.pw> Cc: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Ard Biesheuvel authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 4911ee40 upstream. The EFI mixed mode entry code goes through the ordinary startup_32() routine before jumping into the kernel's EFI boot code in 64-bit mode. The 32-bit startup code must be entered with paging disabled, but this is not documented as a requirement for the EFI handover protocol, and so we should disable paging explicitly when entering the kernel from 32-bit EFI firmware. Signed-off-by:
Ard Biesheuvel <ardb@kernel.org> Cc: <stable@vger.kernel.org> Cc: Arvind Sankar <nivedita@alum.mit.edu> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: https://lkml.kernel.org/r/20191224132909.102540-4-ardb@kernel.orgSigned-off-by:
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Keiya Nobuta authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 9c06ac4c upstream. If hub_activate() is called before D+ has stabilized after remote wakeup, the following situation might occur: __ ___________________ / \ / D+ __/ \__/ Hub _______________________________ | ^ ^ ^ | | | | Host _____v__|___|___________|______ | | | | | | | \-- Interrupt Transfer (*3) | | \-- ClearPortFeature (*2) | \-- GetPortStatus (*1) \-- Host detects remote wakeup - D+ goes high, Host starts running by remote wakeup - D+ is not stable, goes low - Host requests GetPortStatus at (*1) and gets the following hub status: - Current Connect Status bit is 0 - Connect Status Change bit is 1 - D+ stabilizes, goes high - Host requests ClearPortFeature and thus Connect Status Change bit is cleared at (*2) - After waiting 100 ms, Host starts the Interrupt Transfer at (*3) - Since the Connect Status Change bit is 0, Hub returns NAK. In this case, port_event() is not called in hub_event() and Host cannot recognize device. To solve this issue, flag change_bits even if only Connect Status Change bit is 1 when got in the first GetPortStatus. This issue occurs rarely because it only if D+ changes during a very short time between GetPortStatus and ClearPortFeature. However, it is fatal if it occurs in embedded system. Signed-off-by:
Keiya Nobuta <nobuta.keiya@fujitsu.com> Cc: stable <stable@vger.kernel.org> Acked-by:
Alan Stern <stern@rowland.harvard.edu> Link: https://lore.kernel.org/r/20200109051448.28150-1-nobuta.keiya@fujitsu.comSigned-off-by:
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Dan Carpenter authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 28d76df1 upstream. Tom Hatskevich reported that we look up "iocp" then, in the called functions we do a second copy_from_user() and look it up again. The problem that could cause is: drivers/message/fusion/mptctl.c 674 /* All of these commands require an interrupt or 675 * are unknown/illegal. 676 */ 677 if ((ret = mptctl_syscall_down(iocp, nonblock)) != 0) ^^^^ We take this lock. 678 return ret; 679 680 if (cmd == MPTFWDOWNLOAD) 681 ret = mptctl_fw_download(arg); ^^^ Then the user memory changes and we look up "iocp" again but a different one so now we are holding the incorrect lock and have a race condition. 682 else if (cmd == MPTCOMMAND) 683 ret = mptctl_mpt_command(arg); The security impact of this bug is not as bad as it could have been because these operations are all privileged and root already has enormous destructive power. But it's still worth fixing. This patch passes the "iocp" pointer to the functions to avoid the second lookup. That deletes 100 lines of code from the driver so it's a nice clean up as well. Link: https://lore.kernel.org/r/20200114123414.GA7957@kadamReported-by:
Tom Hatskevich <tom2001tom.23@gmail.com> Reviewed-by:
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Johan Hovold authored
BugLink: https://bugs.launchpad.net/bugs/1860681 commit 9715a43e upstream. Check for NULL port data in the modem- and line-status handlers to avoid dereferencing a NULL pointer in the unlikely case where a port device isn't bound to a driver (e.g. after an allocation failure on port probe). Note that the other (stubbed) event handlers qt2_process_xmit_empty() and qt2_process_flush() would need similar sanity checks in case they are ever implemented. Fixes: f7a33e60 ("USB: serial: add quatech2 usb to serial driver") Cc: stable <stable@vger.kernel.org> # 3.5 Reviewed-by:
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