- 17 May, 2015 3 commits
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Jason Gunthorpe authored
commit 28521440 upstream. When accepting a new IPv4 connect to an IPv6 socket, the CMA tries to canonize the address family to IPv4, but does not properly process the listening sockaddr to get the listening port, and does not properly set the address family of the canonized sockaddr. Fixes: e51060f0 ("IB: IP address based RDMA connection manager") Reported-By:
Yotam Kenneth <yotamke@mellanox.com> Signed-off-by:
Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Tested-by:
Haggai Eran <haggaie@mellanox.com> Signed-off-by:
Doug Ledford <dledford@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ryusuke Konishi authored
commit d8fd150f upstream. The range check for b-tree level parameter in nilfs_btree_root_broken() is wrong; it accepts the case of "level == NILFS_BTREE_LEVEL_MAX" even though the level is limited to values in the range of 0 to (NILFS_BTREE_LEVEL_MAX - 1). Since the level parameter is read from storage device and used to index nilfs_btree_path array whose element count is NILFS_BTREE_LEVEL_MAX, it can cause memory overrun during btree operations if the boundary value is set to the level parameter on device. This fixes the broken sanity check and adds a comment to clarify that the upper bound NILFS_BTREE_LEVEL_MAX is exclusive. Signed-off-by:
Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Junxiao Bi authored
commit b1432a2a upstream. There is a race window in dlm_get_lock_resource(), which may return a lock resource which has been purged. This will cause the process to hang forever in dlmlock() as the ast msg can't be handled due to its lock resource not existing. dlm_get_lock_resource { ... spin_lock(&dlm->spinlock); tmpres = __dlm_lookup_lockres_full(dlm, lockid, namelen, hash); if (tmpres) { spin_unlock(&dlm->spinlock); >>>>>>>> race window, dlm_run_purge_list() may run and purge the lock resource spin_lock(&tmpres->spinlock); ... spin_unlock(&tmpres->spinlock); } } Signed-off-by:
Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <joseph.qi@huawei.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by:
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- 13 May, 2015 26 commits
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Greg Kroah-Hartman authored
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Vineet Gupta authored
commit e4140819 upstream. A malicious signal handler / restorer can DOS the system by fudging the user regs saved on stack, causing weird things such as sigreturn returning to user mode PC but cpu state still being kernel mode.... Ensure that in sigreturn path status32 always has U bit; any other bogosity (gargbage PC etc) will be taken care of by normal user mode exceptions mechanisms. Reproducer signal handler: void handle_sig(int signo, siginfo_t *info, void *context) { ucontext_t *uc = context; struct user_regs_struct *regs = &(uc->uc_mcontext.regs); regs->scratch.status32 = 0; } Before the fix, kernel would go off to weeds like below: --------->8----------- [ARCLinux]$ ./signal-test Path: /signal-test CPU: 0 PID: 61 Comm: signal-test Not tainted 4.0.0-rc5+ #65 task: 8f177880 ti: 5ffe6000 task.ti: 8f15c000 [ECR ]: 0x00220200 => Invalid Write @ 0x00000010 by insn @ 0x00010698 [EFA ]: 0x00000010 [BLINK ]: 0x2007c1ee [ERET ]: 0x10698 [STAT32]: 0x00000000 : <-------- BTA: 0x00010680 SP: 0x5ffe7e48 FP: 0x00000000 LPS: 0x20003c6c LPE: 0x20003c70 LPC: 0x00000000 ... --------->8----------- Reported-by:
Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by:
Vineet Gupta <vgupta@synopsys.com> Signed-off-by:
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hujianyang authored
commit 9aa272b4 upstream. Running mtd-utils/tests/ubi-tests/io_basic.c could cause soft lockup or watchdog reset. It is because *updatevol* will perform ubi_check_volume() after updating finish and this function will full scan the updated lebs if the volume is initialized as STATIC_VOLUME. This patch adds *cond_resched()* in the loop of lebs scan to avoid soft lockup. Helped by Richard Weinberger <richard@nod.at> [ 2158.067096] INFO: rcu_sched self-detected stall on CPU { 1} (t=2101 jiffies g=1606 c=1605 q=56) [ 2158.172867] CPU: 1 PID: 2073 Comm: io_basic Tainted: G O 3.10.53 #21 [ 2158.172898] [<c000f624>] (unwind_backtrace+0x0/0x120) from [<c000c294>] (show_stack+0x10/0x14) [ 2158.172918] [<c000c294>] (show_stack+0x10/0x14) from [<c008ac3c>] (rcu_check_callbacks+0x1c0/0x660) [ 2158.172936] [<c008ac3c>] (rcu_check_callbacks+0x1c0/0x660) from [<c002b480>] (update_process_times+0x38/0x64) [ 2158.172953] [<c002b480>] (update_process_times+0x38/0x64) from [<c005ff38>] (tick_sched_handle+0x54/0x60) [ 2158.172966] [<c005ff38>] (tick_sched_handle+0x54/0x60) from [<c00601ac>] (tick_sched_timer+0x44/0x74) [ 2158.172978] [<c00601ac>] (tick_sched_timer+0x44/0x74) from [<c003f348>] (__run_hrtimer+0xc8/0x1b8) [ 2158.172992] [<c003f348>] (__run_hrtimer+0xc8/0x1b8) from [<c003fd9c>] (hrtimer_interrupt+0x128/0x2a4) [ 2158.173007] [<c003fd9c>] (hrtimer_interrupt+0x128/0x2a4) from [<c0246f1c>] (arch_timer_handler_virt+0x28/0x30) [ 2158.173022] [<c0246f1c>] (arch_timer_handler_virt+0x28/0x30) from [<c0086214>] (handle_percpu_devid_irq+0x9c/0x124) [ 2158.173036] [<c0086214>] (handle_percpu_devid_irq+0x9c/0x124) from [<c0082bd8>] (generic_handle_irq+0x20/0x30) [ 2158.173049] [<c0082bd8>] (generic_handle_irq+0x20/0x30) from [<c000969c>] (handle_IRQ+0x64/0x8c) [ 2158.173060] [<c000969c>] (handle_IRQ+0x64/0x8c) from [<c0008544>] (gic_handle_irq+0x3c/0x60) [ 2158.173074] [<c0008544>] (gic_handle_irq+0x3c/0x60) from [<c02f0f80>] (__irq_svc+0x40/0x50) [ 2158.173083] Exception stack(0xc4043c98 to 0xc4043ce0) [ 2158.173092] 3c80: c4043ce4 00000019 [ 2158.173102] 3ca0: 1f8a865f c050ad10 1f8a864c 00000031 c04b5970 0003ebce 00000000 f3550000 [ 2158.173113] 3cc0: bf00bc68 00000800 0003ebce c4043ce0 c0186d14 c0186cb8 80000013 ffffffff [ 2158.173130] [<c02f0f80>] (__irq_svc+0x40/0x50) from [<c0186cb8>] (read_current_timer+0x4/0x38) [ 2158.173145] [<c0186cb8>] (read_current_timer+0x4/0x38) from [<1f8a865f>] (0x1f8a865f) [ 2183.927097] BUG: soft lockup - CPU#1 stuck for 22s! [io_basic:2073] [ 2184.002229] Modules linked in: nandflash(O) [last unloaded: nandflash] Signed-off-by:
Wang Kai <morgan.wang@huawei.com> Signed-off-by:
hujianyang <hujianyang@huawei.com> Signed-off-by:
Richard Weinberger <richard@nod.at> Signed-off-by:
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Krzysztof Kozlowski authored
commit ad774702 upstream. The commit c2be45f0 ("compal-laptop: Use devm_hwmon_device_register_with_groups") wanted to change the registering of hwmon device to resource-managed version. It mostly did it except the main thing - it forgot to use devm-like function so the hwmon device leaked after device removal or probe failure. Signed-off-by:
Krzysztof Kozlowski <k.kozlowski@samsung.com> Fixes: c2be45f0 ("compal-laptop: Use devm_hwmon_device_register_with_groups") Acked-by:
Guenter Roeck <linux@roeck-us.net> Acked-by:
Darren Hart <dvhart@linux.intel.com> Signed-off-by:
Sebastian Reichel <sre@kernel.org> Signed-off-by:
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K. Y. Srinivasan authored
commit 73cffdb6 upstream. Don't wait after sending request for offers to the host. This wait is unnecessary and simply adds 5 seconds to the boot time. Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Sudip Mukherjee authored
commit 2c20d92d upstream. the lcd type as defined in the Kconfig is not matching in the code. as a result the rs, rw and en pins were getting interchanged. Kconfig defines the value of PANEL_LCD to be 1 if we select custom configuration but in the code LCD_TYPE_CUSTOM is defined as 5. my hardware is LCD_TYPE_CUSTOM, but the pins were assigned to it as pins of LCD_TYPE_OLD, and it was not working. Now values are corrected with referenece to the values defined in Kconfig and it is working. checked on JHD204A lcd with LCD_TYPE_CUSTOM configuration. Signed-off-by:
Sudip Mukherjee <sudip@vectorindia.org> Acked-by:
Willy Tarreau <w@1wt.eu> [wt: backport to 3.10 and 3.14] Signed-off-by:
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Andrzej Pietrasiewicz authored
commit eb132ccb upstream. Function-specific setup requests should be handled in such a way, that apart from filling in the data buffer, the requests are also actually enqueued: if function-specific setup is called from composte_setup(), the "usb_ep_queue()" block of code in composite_setup() is skipped. The printer function lacks this part and it results in e.g. get device id requests failing: the host expects some response, the device prepares it but does not equeue it for sending to the host, so the host finally asserts timeout. This patch adds enqueueing the prepared responses. Fixes: 2e87edf4: "usb: gadget: make g_printer use composite" Signed-off-by:
Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by:
Felipe Balbi <balbi@ti.com> [ported to stable 3.10 and 3.14] Signed-off-by:
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Felipe Balbi authored
commit ea16328f upstream. Make sure we're using the new macro, so our resume signaling will always pass certification. Signed-off-by:
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Felipe Balbi authored
commit 84c0d178 upstream. Make sure we're using the new macro, so our resume signaling will always pass certification. Signed-off-by:
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Felipe Balbi authored
commit 309be239 upstream. Make sure we're using the new macro, so our resume signaling will always pass certification. Based on original work by Bin Liu <Bin Liu <b-liu@ti.com>> Cc: Bin Liu <b-liu@ti.com> Signed-off-by:
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Alex Deucher authored
commit cd17e02f upstream. Seems to have problems with high mclks. bug: https://bugs.freedesktop.org/show_bug.cgi?id=76490Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Christoph Hellwig authored
commit 579d69bc upstream. The 3w-sas driver needs to tear down the dma mappings before returning the command to the midlayer, as there is no guarantee the sglist and count are valid after that point. Also remove the dma mapping helpers which have another inherent race due to the request_id index. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reported-by:
Torsten Luettgert <ml-lkml@enda.eu> Tested-by:
Bernd Kardatzki <Bernd.Kardatzki@med.uni-tuebingen.de> Acked-by:
Adam Radford <aradford@gmail.com> Signed-off-by:
James Bottomley <JBottomley@Odin.com> Signed-off-by:
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Christoph Hellwig authored
commit 118c855b upstream. The 3w-9xxx driver needs to tear down the dma mappings before returning the command to the midlayer, as there is no guarantee the sglist and count are valid after that point. Also remove the dma mapping helpers which have another inherent race due to the request_id index. Signed-off-by:
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Christoph Hellwig authored
commit 9cd95546 upstream. The 3w-xxxx driver needs to tear down the dma mappings before returning the command to the midlayer, as there is no guarantee the sglist and count are valid after that point. Also remove the dma mapping helpers which have another inherent race due to the request_id index. Signed-off-by:
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Lukas Czerner authored
commit d2dc317d upstream. Currently it is possible to lose whole file system block worth of data when we hit the specific interaction with unwritten and delayed extents in status extent tree. The problem is that when we insert delayed extent into extent status tree the only way to get rid of it is when we write out delayed buffer. However there is a limitation in the extent status tree implementation so that when inserting unwritten extent should there be even a single delayed block the whole unwritten extent would be marked as delayed. At this point, there is no way to get rid of the delayed extents, because there are no delayed buffers to write out. So when a we write into said unwritten extent we will convert it to written, but it still remains delayed. When we try to write into that block later ext4_da_map_blocks() will set the buffer new and delayed and map it to invalid block which causes the rest of the block to be zeroed loosing already written data. For now we can fix this by simply not allowing to set delayed status on written extent in the extent status tree. Also add WARN_ON() to make sure that we notice if this happens in the future. This problem can be easily reproduced by running the following xfs_io. xfs_io -f -c "pwrite -S 0xaa 4096 2048" \ -c "falloc 0 131072" \ -c "pwrite -S 0xbb 65536 2048" \ -c "fsync" /mnt/test/fff echo 3 > /proc/sys/vm/drop_caches xfs_io -c "pwrite -S 0xdd 67584 2048" /mnt/test/fff This can be theoretically also reproduced by at random by running fsx, but it's not very reliable, though on machines with bigger page size (like ppc) this can be seen more often (especially xfstest generic/127) Signed-off-by:
Lukas Czerner <lczerner@redhat.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Ilya Dryomov authored
commit 082a75da upstream. When we end I/O struct request with error, we need to pass obj_request->length as @nr_bytes so that the entire obj_request worth of bytes is completed. Otherwise block layer ends up confused and we trip on rbd_assert(more ^ (which == img_request->obj_request_count)); in rbd_img_obj_callback() due to more being true no matter what. We already do it in most cases but we are missing some, in particular those where we don't even get a chance to submit any obj_requests, due to an early -ENOMEM for example. A number of obj_request->xferred assignments seem to be redundant but I haven't touched any of obj_request->xferred stuff to keep this small and isolated. Cc: Alex Elder <elder@linaro.org> Reported-by:
Shawn Edwards <lesser.evil@gmail.com> Reviewed-by:
Sage Weil <sage@redhat.com> Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Signed-off-by:
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Ludovic Desroches authored
commit a8d4e016 upstream. Maxburst was not set when doing the dma slave configuration. This value is checked by the recently introduced xdmac. It causes an error when doing the slave configuration and so prevents from using dma. Signed-off-by:
Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by:
Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by:
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Charles Keepax authored
commit a2d97723 upstream. Correct small copy and paste error where autodisable was not being enabled for the SOC_DAPM_SINGLE_TLV_AUTODISABLE control. Signed-off-by:
Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Michal Simek authored
commit 6befa9d8 upstream. Do not probe all serial drivers by of_serial.c which are using device_type = "serial"; property. Only drivers which have valid compatible strings listed in the driver should be probed. When PORT_UNKNOWN is setup probe will fail anyway. Arnd quotation about driver historical background: "when I wrote that driver initially, the idea was that it would get used as a stub to hook up all other serial drivers but after that, the common code learned to create platform devices from DT" This patch fix the problem with on the system with xilinx_uartps and 16550a where of_serial failed to register for xilinx_uartps and because of irq_dispose_mapping() removed irq_desc. Then when xilinx_uartps was asking for irq with request_irq() EINVAL is returned. Signed-off-by:
Michal Simek <michal.simek@xilinx.com> Acked-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Takashi Iwai authored
commit 7290006d upstream. This patch adds the missing flag to enable "Mute-LED Mode" mixer enum ctl for Thinkpads that have also the software mute-LED control. Reported-and-tested-by:
Pali Rohár <pali.rohar@gmail.com> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Takashi Iwai authored
commit ee52e56e upstream. The mute-LED mode control has the fixed on/off states that are supposed to remain on/off regardless of the master switch. However, this doesn't work actually because the vmaster hook is called in the vmaster code itself. This patch fixes it by calling the hook indirectly after checking the mute LED mode. Reported-and-tested-by:
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Peter Zubaj authored
commit 7241ea55 upstream. Looks like audigy emu10k2 (probably emu10k1 - sb live too) support two modes for DMA. Second mode is useful for 64 bit os with more then 2 GB of ram (fixes problems with big soundfont loading) 1) 32MB from 2 GB address space using 8192 pages (used now as default) 2) 16MB from 4 GB address space using 4096 pages Mode is set using HCFG_EXPANDED_MEM flag in HCFG register. Also format of emu10k2 page table is then different. Signed-off-by:
Peter Zubaj <pzubaj@marticonet.sk> Tested-by:
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Takashi Iwai authored
commit d0226082 upstream. Some models provide too long string for the shortname that has 32bytes including the terminator, and it results in a non-terminated string exposed to the user-space. This isn't too critical, though, as the string is stopped at the succeeding longname string. This patch fixes such entries by dropping "SB" prefix (it's enough to fit within 32 bytes, so far). Meanwhile, it also changes strcpy() with strlcpy() to make sure that this kind of problem won't happen in future, too. Signed-off-by:
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Takashi Iwai authored
commit 1c94e65c upstream. The OSS emulation in synth-emux helper has a potential AB/BA deadlock at the simultaneous closing and opening: close -> snd_seq_release() -> sne_seq_free_client() -> snd_seq_delete_all_ports(): takes client->ports_mutex -> port_delete() -> snd_emux_unuse(): takes emux->register_mutex open -> snd_seq_oss_open() -> snd_emux_open_seq_oss(): takes emux->register_mutex -> snd_seq_event_port_attach() -> snd_seq_create_port(): takes client->ports_mutex This patch addresses the deadlock by reducing the rance taking emux->register_mutex in snd_emux_open_seq_oss(). The lock is needed for the refcount handling, so move it locally. The calls in emux_seq.c are already with the mutex, thus they are replaced with the version without mutex lock/unlock. Signed-off-by:
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Takashi Iwai authored
commit 07b0e5d4 upstream. The emux-synth driver has a possible AB/BA mutex deadlock at unloading the emu10k1 driver: snd_emux_free() -> snd_emux_detach_seq(): mutex_lock(&emu->register_mutex) -> snd_seq_delete_kernel_client() -> snd_seq_free_client(): mutex_lock(®ister_mutex) snd_seq_release() -> snd_seq_free_client(): mutex_lock(®ister_mutex) -> snd_seq_delete_all_ports() -> snd_emux_unuse(): mutex_lock(&emu->register_mutex) Basically snd_emux_detach_seq() doesn't need a protection of emu->register_mutex as it's already being unregistered. So, we can get rid of this for avoiding the deadlock. Signed-off-by:
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David S. Miller authored
[ Upstream commit a134f083 ] If we don't do that, then the poison value is left in the ->pprev backlink. This can cause crashes if we do a disconnect, followed by a connect(). Tested-by:
Wen Xu <hotdog3645@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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- 06 May, 2015 11 commits
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Greg Kroah-Hartman authored
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Geert Uytterhoeven authored
commit 7f8998c7 upstream. The different architectures used their own (and different) declarations: extern __visible const void __nosave_begin, __nosave_end; extern const void __nosave_begin, __nosave_end; extern long __nosave_begin, __nosave_end; Consolidate them using the first variant in <asm/sections.h>. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by:
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Jann Horn authored
commit 8b01fc86 upstream. This prevents a race between chown() and execve(), where chowning a setuid-user binary to root would momentarily make the binary setuid root. This patch was mostly written by Linus Torvalds. Signed-off-by:
Jann Horn <jann@thejh.net> Signed-off-by:
Charles Williams <ciwillia@brocade.com> Signed-off-by:
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Junjie Mao authored
commit 1c34203a upstream. It is not necessary to call device_remove_groups() when device_add_groups() fails. The group added by device_add_groups() should be removed if sysfs_create_link() fails. Fixes: fa6fdb33 ("driver core: bus_type: add dev_groups") Signed-off-by:
Junjie Mao <junjie_mao@yeah.net> Signed-off-by:
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Dan Carpenter authored
commit 13f6b191 upstream. Using the indenting we can see the curly braces were obviously intended. This is a static checker fix, but my guess is that we don't read enough bytes, because we don't calculate "t_len" correctly. Fixes: f1d82698 ('memstick: use fully asynchronous request processing') Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Cc: Alex Dubov <oakad@yahoo.com> Signed-off-by:
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Nishanth Menon authored
commit f4831605 upstream. time_init invokes timer64_init (which is __init annotation) since all of these are invoked at init time, lets maintain consistency by ensuring time_init is marked appropriately as well. This fixes the following warning with CONFIG_DEBUG_SECTION_MISMATCH=y WARNING: vmlinux.o(.text+0x3bfc): Section mismatch in reference from the function time_init() to the function .init.text:timer64_init() The function time_init() references the function __init timer64_init(). This is often because time_init lacks a __init annotation or the annotation of timer64_init is wrong. Fixes: 546a3954 ("C6X: time management") Signed-off-by:
Nishanth Menon <nm@ti.com> Signed-off-by:
Mark Salter <msalter@redhat.com> Signed-off-by:
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Vutla, Lokesh authored
commit 6d7e7e02 upstream. For cases where total length of an input SGs is not same as length of the input data for encryption, omap-aes driver crashes. This happens in the case when IPsec is trying to use omap-aes driver. To avoid this, we copy all the pages from the input SG list into a contiguous buffer and prepare a single element SG list for this buffer with length as the total bytes to crypt, which is similar thing that is done in case of unaligned lengths. Fixes: 6242332f ("crypto: omap-aes - Add support for cases of unaligned lengths") Signed-off-by:
Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Nicolas Iooss authored
commit a3fa71c4 upstream. In struct wl18xx_acx_rx_rate_stat, rx_frames_per_rates field is an array, not a number. This means WL18XX_DEBUGFS_FWSTATS_FILE can't be used to display this field in debugfs (it would display a pointer, not the actual data). Use WL18XX_DEBUGFS_FWSTATS_FILE_ARRAY instead. This bug has been found by adding a __printf attribute to wl1271_format_buffer. gcc complained about "format '%u' expects argument of type 'unsigned int', but argument 5 has type 'u32 *'". Fixes: c5d94169 ("wl18xx: use new fw stats structures") Signed-off-by:
Nicolas Iooss <nicolas.iooss_linux@m4x.org> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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mancha security authored
commit 0b053c95 upstream. OPTIMIZER_HIDE_VAR(), as defined when using gcc, is insufficient to ensure protection from dead store optimization. For the random driver and crypto drivers, calls are emitted ... $ gdb vmlinux (gdb) disassemble memzero_explicit Dump of assembler code for function memzero_explicit: 0xffffffff813a18b0 <+0>: push %rbp 0xffffffff813a18b1 <+1>: mov %rsi,%rdx 0xffffffff813a18b4 <+4>: xor %esi,%esi 0xffffffff813a18b6 <+6>: mov %rsp,%rbp 0xffffffff813a18b9 <+9>: callq 0xffffffff813a7120 <memset> 0xffffffff813a18be <+14>: pop %rbp 0xffffffff813a18bf <+15>: retq End of assembler dump. (gdb) disassemble extract_entropy [...] 0xffffffff814a5009 <+313>: mov %r12,%rdi 0xffffffff814a500c <+316>: mov $0xa,%esi 0xffffffff814a5011 <+321>: callq 0xffffffff813a18b0 <memzero_explicit> 0xffffffff814a5016 <+326>: mov -0x48(%rbp),%rax [...] ... but in case in future we might use facilities such as LTO, then OPTIMIZER_HIDE_VAR() is not sufficient to protect gcc from a possible eviction of the memset(). We have to use a compiler barrier instead. Minimal test example when we assume memzero_explicit() would *not* be a call, but would have been *inlined* instead: static inline void memzero_explicit(void *s, size_t count) { memset(s, 0, count); <foo> } int main(void) { char buff[20]; snprintf(buff, sizeof(buff) - 1, "test"); printf("%s", buff); memzero_explicit(buff, sizeof(buff)); return 0; } With <foo> := OPTIMIZER_HIDE_VAR(): (gdb) disassemble main Dump of assembler code for function main: [...] 0x0000000000400464 <+36>: callq 0x400410 <printf@plt> 0x0000000000400469 <+41>: xor %eax,%eax 0x000000000040046b <+43>: add $0x28,%rsp 0x000000000040046f <+47>: retq End of assembler dump. With <foo> := barrier(): (gdb) disassemble main Dump of assembler code for function main: [...] 0x0000000000400464 <+36>: callq 0x400410 <printf@plt> 0x0000000000400469 <+41>: movq $0x0,(%rsp) 0x0000000000400471 <+49>: movq $0x0,0x8(%rsp) 0x000000000040047a <+58>: movl $0x0,0x10(%rsp) 0x0000000000400482 <+66>: xor %eax,%eax 0x0000000000400484 <+68>: add $0x28,%rsp 0x0000000000400488 <+72>: retq End of assembler dump. As can be seen, movq, movq, movl are being emitted inlined via memset(). Reference: http://thread.gmane.org/gmane.linux.kernel.cryptoapi/13764/ Fixes: d4c5efdb ("random: add and use memzero_explicit() for clearing data") Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by:
mancha security <mancha1@zoho.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by:
Stephan Mueller <smueller@chronox.de> Signed-off-by:
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Sabrina Dubroca authored
commit 08e83316 upstream. There is a race condition between e1000_change_mtu's cleanups and netpoll, when we change the MTU across jumbo size: Changing MTU frees all the rx buffers: e1000_change_mtu -> e1000_down -> e1000_clean_all_rx_rings -> e1000_clean_rx_ring Then, close to the end of e1000_change_mtu: pr_info -> ... -> netpoll_poll_dev -> e1000_clean -> e1000_clean_rx_irq -> e1000_alloc_rx_buffers -> e1000_alloc_frag And when we come back to do the rest of the MTU change: e1000_up -> e1000_configure -> e1000_configure_rx -> e1000_alloc_jumbo_rx_buffers alloc_jumbo finds the buffers already != NULL, since data (shared with page in e1000_rx_buffer->rxbuf) has been re-alloc'd, but it's garbage, or at least not what is expected when in jumbo state. This results in an unusable adapter (packets don't get through), and a NULL pointer dereference on the next call to e1000_clean_rx_ring (other mtu change, link down, shutdown): BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff81194d6e>] put_compound_page+0x7e/0x330 [...] Call Trace: [<ffffffff81195445>] put_page+0x55/0x60 [<ffffffff815d9f44>] e1000_clean_rx_ring+0x134/0x200 [<ffffffff815da055>] e1000_clean_all_rx_rings+0x45/0x60 [<ffffffff815df5e0>] e1000_down+0x1c0/0x1d0 [<ffffffff811e2260>] ? deactivate_slab+0x7f0/0x840 [<ffffffff815e21bc>] e1000_change_mtu+0xdc/0x170 [<ffffffff81647050>] dev_set_mtu+0xa0/0x140 [<ffffffff81664218>] do_setlink+0x218/0xac0 [<ffffffff814459e9>] ? nla_parse+0xb9/0x120 [<ffffffff816652d0>] rtnl_newlink+0x6d0/0x890 [<ffffffff8104f000>] ? kvm_clock_read+0x20/0x40 [<ffffffff810a2068>] ? sched_clock_cpu+0xa8/0x100 [<ffffffff81663802>] rtnetlink_rcv_msg+0x92/0x260 By setting the allocator to a dummy version, netpoll can't mess up our rx buffers. The allocator is set back to a sane value in e1000_configure_rx. Fixes: edbbb3ca ("e1000: implement jumbo receive with partial descriptors") Signed-off-by:
Sabrina Dubroca <sd@queasysnail.net> Tested-by:
Aaron Brown <aaron.f.brown@intel.com> Signed-off-by:
Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by:
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Calvin Owens authored
commit 28423ad2 upstream. While debugging an issue with excessive softirq usage, I encountered the following note in commit 3e339b5d ("softirq: Use hotplug thread infrastructure"): [ paulmck: Call rcu_note_context_switch() with interrupts enabled. ] ...but despite this note, the patch still calls RCU with IRQs disabled. This seemingly innocuous change caused a significant regression in softirq CPU usage on the sending side of a large TCP transfer (~1 GB/s): when introducing 0.01% packet loss, the softirq usage would jump to around 25%, spiking as high as 50%. Before the change, the usage would never exceed 5%. Moving the call to rcu_note_context_switch() after the cond_sched() call, as it was originally before the hotplug patch, completely eliminated this problem. Signed-off-by:
Calvin Owens <calvinowens@fb.com> Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:
Mike Galbraith <mgalbraith@suse.de> Signed-off-by:
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