- 20 Feb, 2015 40 commits
-
-
Johannes Weiner authored
commit 2d6d7f98 upstream. Tejun, while reviewing the code, spotted the following race condition between the dirtying and truncation of a page: __set_page_dirty_nobuffers() __delete_from_page_cache() if (TestSetPageDirty(page)) page->mapping = NULL if (PageDirty()) dec_zone_page_state(page, NR_FILE_DIRTY); dec_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE); if (page->mapping) account_page_dirtied(page) __inc_zone_page_state(page, NR_FILE_DIRTY); __inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE); which results in an imbalance of NR_FILE_DIRTY and BDI_RECLAIMABLE. Dirtiers usually lock out truncation, either by holding the page lock directly, or in case of zap_pte_range(), by pinning the mapcount with the page table lock held. The notable exception to this rule, though, is do_wp_page(), for which this race exists. However, do_wp_page() already waits for a locked page to unlock before setting the dirty bit, in order to prevent a race where clear_page_dirty() misses the page bit in the presence of dirty ptes. Upgrade that wait to a fully locked set_page_dirty() to also cover the situation explained above. Afterwards, the code in set_page_dirty() dealing with a truncation race is no longer needed. Remove it. Reported-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> [bwh: Backported to 3.2: - Adjust context - Use VM_BUG_ON() rather than VM_BUG_ON_PAGE()] Signed-off-by:
Ben Hutchings <ben@decadent.org.uk>
-
Miklos Szeredi authored
commit ed6d7c8e upstream. There's only one caller of set_page_dirty_balance() and that will call it with page_mkwrite == 0. The page_mkwrite argument was unused since commit b827e496 "mm: close page_mkwrite races". Signed-off-by:
Miklos Szeredi <mszeredi@suse.cz> Signed-off-by:
-
Konstantin Khlebnikov authored
commit 7a3ef208 upstream. Constantly forking task causes unlimited grow of anon_vma chain. Each next child allocates new level of anon_vmas and links vma to all previous levels because pages might be inherited from any level. This patch adds heuristic which decides to reuse existing anon_vma instead of forking new one. It adds counter anon_vma->degree which counts linked vmas and directly descending anon_vmas and reuses anon_vma if counter is lower than two. As a result each anon_vma has either vma or at least two descending anon_vmas. In such trees half of nodes are leafs with alive vmas, thus count of anon_vmas is no more than two times bigger than count of vmas. This heuristic reuses anon_vmas as few as possible because each reuse adds false aliasing among vmas and rmap walker ought to scan more ptes when it searches where page is might be mapped. Link: http://lkml.kernel.org/r/20120816024610.GA5350@evergreen.ssec.wisc.edu Fixes: 5beb4930 ("mm: change anon_vma linking to fix multi-process server scalability issue") [akpm@linux-foundation.org: fix typo, per Rik] Signed-off-by:
Konstantin Khlebnikov <koct9i@gmail.com> Reported-by:
Daniel Forrest <dan.forrest@ssec.wisc.edu> Tested-by:
Michal Hocko <mhocko@suse.cz> Tested-by:
Jerome Marchand <jmarchan@redhat.com> Reviewed-by:
Rik van Riel <riel@redhat.com> Signed-off-by:
-
Dmitry Torokhov authored
commit 9333caea upstream. When KBC is in active multiplexing mode the touchpad on this laptop does not work. Reported-by:
Bilal Koc <koc.bilo@googlemail.com> Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
-
Ashay Jaiswal authored
commit 83b0302d upstream. The regulator framework maintains a list of consumer regulators for a regulator device and protects it from concurrent access using the regulator device's mutex lock. In the case of regulator_put() the consumer is removed and regulator device's parameters are updated without holding the regulator device's mutex. This would lead to a race condition between the regulator_put() and any function which traverses the consumer list or modifies regulator device's parameters. Fix this race condition by holding the regulator device's mutex in case of regulator_put. Signed-off-by:
Ashay Jaiswal <ashayj@codeaurora.org> Signed-off-by:
Mark Brown <broonie@kernel.org> [bwh: Backported to 3.2: - Adjust context - Don't touch the comment; __regulator_put() has not been split out of regulator_put() here] Signed-off-by:
-
Srihari Vijayaraghavan authored
commit 148e9a71 upstream. On some laptops, keyboard needs to be reset in order to successfully detect touchpad (e.g., some Gigabyte laptop models with Elantech touchpads). Without resettin keyboard touchpad pretends to be completely dead. Based on the original patch by Mateusz Jończyk this version has been expanded to include DMI based detection & application of the fix automatically on the affected models of laptops. This has been confirmed to fix problem by three users already on three different models of laptops. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=81331Signed-off-by:
Srihari Vijayaraghavan <linux.bug.reporting@gmail.com> Acked-by:
Mateusz Jończyk <mat.jonczyk@o2.pl> Tested-by:
Guillaum Bouchard <guillaum.bouchard@gmail.com> Signed-off-by:
-
Sasha Levin authored
commit 6ada1fc0 upstream. An unvalidated user input is multiplied by a constant, which can result in an undefined behaviour for large values. While this is validated later, we should avoid triggering undefined behaviour. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by:
Sasha Levin <sasha.levin@oracle.com> [jstultz: include trivial milisecond->microsecond correction noticed by Andy] Signed-off-by:
John Stultz <john.stultz@linaro.org> [bwh: Backported to 3.2: adjust filename] Signed-off-by:
-
Andy Shevchenko authored
commit 4aaa7187 upstream. DMA mapped IO should be unmapped on the error path in probe() and unconditionally on remove(). Fixes: 62936009 ([libata] Add 460EX on-chip SATA driver, sata_dwc_460ex) Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
-
Linus Torvalds authored
commit fee7e49d upstream. Jay Foad reports that the address sanitizer test (asan) sometimes gets confused by a stack pointer that ends up being outside the stack vma that is reported by /proc/maps. This happens due to an interaction between RLIMIT_STACK and the guard page: when we do the guard page check, we ignore the potential error from the stack expansion, which effectively results in a missing guard page, since the expected stack expansion won't have been done. And since /proc/maps explicitly ignores the guard page (commit d7824370: "mm: fix up some user-visible effects of the stack guard page"), the stack pointer ends up being outside the reported stack area. This is the minimal patch: it just propagates the error. It also effectively makes the guard page part of the stack limit, which in turn measn that the actual real stack is one page less than the stack limit. Let's see if anybody notices. We could teach acct_stack_growth() to allow an extra page for a grow-up/grow-down stack in the rlimit test, but I don't want to add more complexity if it isn't needed. Reported-and-tested-by:
Jay Foad <jay.foad@gmail.com> Signed-off-by:
-
Zidan Wang authored
commit 22ee76da upstream. wm8960 codec can't support sample rate 11250, it must be 11025. Signed-off-by:
Zidan Wang <b50113@freescale.com> Acked-by:
Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by:
-
David Peterson authored
commit 1ae78a48 upstream. Added virtual com port VID/PID entries for CEL USB sticks and MeshWorks devices. Signed-off-by:
David Peterson <david.peterson@cel.com> Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
-
Michael S. Tsirkin authored
commit a1eb03f5 upstream. The reason we defer kfree until release function is because it's a general rule for kobjects: kfree of the reference counter itself is only legal in the release function. Previous patch didn't make this clear, document this in code. Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> [bwh: Backported to 3.2: adjust filename] Signed-off-by:
-
Sasha Levin authored
commit 63bd62a0 upstream. A struct device which has just been unregistered can live on past the point at which a driver decides to drop it's initial reference to the kobject gained on allocation. This implies that when releasing a virtio device, we can't free a struct virtio_device until the underlying struct device has been released, which might not happen immediately on device_unregister(). Unfortunately, this is exactly what virtio pci does: it has an empty release callback, and frees memory immediately after unregistering the device. This causes an easy to reproduce crash if CONFIG_DEBUG_KOBJECT_RELEASE it enabled. To fix, free the memory only once we know the device is gone in the release callback. Signed-off-by:
-
Wanlong Gao authored
commit 9bffdca8 upstream. Use dev_to_virtio wrapper in virtio to make code clearly. Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by:
Wanlong Gao <gaowanlong@cn.fujitsu.com> Signed-off-by:
Rusty Russell <rusty@rustcorp.com.au> Signed-off-by:
-
Andy Shevchenko authored
commit 67bf9cda upstream. The FIFO size is 40 accordingly to the specifications, but this means 0x40, i.e. 64 bytes. This patch fixes the typo and enables FIFO size autodetection for Intel MID devices. Fixes: 7063c0d9 (spi/dw_spi: add DMA support) Signed-off-by:
-
Axel Lin authored
commit d297933c upstream. Current code tries to find the highest valid fifo depth by checking the value it wrote to DW_SPI_TXFLTR. There are a few problems in current code: 1) There is an off-by-one in dws->fifo_len setting because it assumes the latest register write fails so the latest valid value should be fifo - 1. 2) We know the depth could be from 2 to 256 from HW spec, so it is not necessary to test fifo == 257. In the case fifo is 257, it means the latest valid setting is fifo = 256. So after the for loop iteration, we should check fifo == 2 case instead of fifo == 257 if detecting the FIFO depth fails. This patch fixes above issues. Signed-off-by:
Axel Lin <axel.lin@ingics.com> Reviewed-and-tested-by:
-
Takashi Iwai authored
commit c507de88 upstream. stac_store_hints() does utterly wrong for masking the values for gpio_dir and gpio_data, likely due to copy&paste errors. Fortunately, this feature is used very rarely, so the impact must be really small. Reported-by:
Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
-
Ben Hutchings authored
This reverts commit 9f871e88, which was commit 1485348d upstream. It can cause connections to stall when a PMTU event occurs. This was fixed by commit 843925f3 ("tcp: Do not apply TSO segment limit to non-TSO packets") upstream, but that depends on other changes to TSO. The original issue this fixed was a performance regression for the sfc driver in extreme cases of TSO (skb with > 100 segments). This is not really very important and it seems best to revert it rather than try to fix it up. Signed-off-by:
-
Preston Fick authored
commit 90441b4d upstream. Fixing typo for MeshConnect IDs. The original PID (0x8875) is not in production and is not needed. Instead it has been changed to the official production PID (0x8857). Signed-off-by:
Preston Fick <pffick@gmail.com> Signed-off-by:
-
Tomi Valkeinen authored
commit 30ea9c52 upstream. fb_deferred_io_fsync() returns the value of schedule_delayed_work() as an error code, but schedule_delayed_work() does not return an error. It returns true/false depending on whether the work was already queued. Fix this by ignoring the return value of schedule_delayed_work(). Signed-off-by:
Tomi Valkeinen <tomi.valkeinen@ti.com> [bwh: Backported to 3.2: adjust filename] Signed-off-by:
-
Tomi Valkeinen authored
commit 92b004d1 upstream. If the probe of an fb driver has been deferred due to missing dependencies, and the probe is later ran when a module is loaded, the fbdev framework will try to find a logo to use. However, the logos are __initdata, and have already been freed. This causes sometimes page faults, if the logo memory is not mapped, sometimes other random crashes as the logo data is invalid, and sometimes nothing, if the fbdev decides to reject the logo (e.g. the random value depicting the logo's height is too big). This patch adds a late_initcall function to mark the logos as freed. In reality the logos are freed later, and fbdev probe may be ran between this late_initcall and the freeing of the logos. In that case we will miss drawing the logo, even if it would be possible. Signed-off-by:
-
Toshiaki Makita authored
commit 796f2da8 upstream. When vlan tags are stacked, it is very likely that the outer tag is stored in skb->vlan_tci and skb->protocol shows the inner tag's vlan_proto. Currently netif_skb_features() first looks at skb->protocol even if there is the outer tag in vlan_tci, thus it incorrectly retrieves the protocol encapsulated by the inner vlan instead of the inner vlan protocol. This allows GSO packets to be passed to HW and they end up being corrupted. Fixes: 58e998c6 ("offloading: Force software GSO for multiple vlan tags.") Signed-off-by:
Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by:
David S. Miller <davem@davemloft.net> [bwh: Backported to 3.2: - We don't support 802.1ad tag offload - Keep passing protocol to harmonize_features()] Signed-off-by:
-
Rabin Vincent authored
commit 7e77bdeb upstream. If a request is backlogged, it's complete() handler will get called twice: once with -EINPROGRESS, and once with the final error code. af_alg's complete handler, unlike other users, does not handle the -EINPROGRESS but instead always completes the completion that recvmsg() is waiting on. This can lead to a return to user space while the request is still pending in the driver. If userspace closes the sockets before the requests are handled by the driver, this will lead to use-after-frees (and potential crashes) in the kernel due to the tfm having been freed. The crashes can be easily reproduced (for example) by reducing the max queue length in cryptod.c and running the following (from http://www.chronox.de/libkcapi.html) on AES-NI capable hardware: $ while true; do kcapi -x 1 -e -c '__ecb-aes-aesni' \ -k 00000000000000000000000000000000 \ -p 00000000000000000000000000000000 >/dev/null & done Signed-off-by:
Rabin Vincent <rabin.vincent@axis.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
-
Jan Kara authored
commit e237ec37 upstream. Check that length specified in a component of a symlink fits in the input buffer we are reading. Also properly ignore component length for component types that do not use it. Otherwise we read memory after end of buffer for corrupted udf image. Reported-by:
Carl Henrik Lunde <chlunde@ping.uio.no> Signed-off-by:
-
Andy Lutomirski authored
commit 394f56fe upstream. The theory behind vdso randomization is that it's mapped at a random offset above the top of the stack. To avoid wasting a page of memory for an extra page table, the vdso isn't supposed to extend past the lowest PMD into which it can fit. Other than that, the address should be a uniformly distributed address that meets all of the alignment requirements. The current algorithm is buggy: the vdso has about a 50% probability of being at the very end of a PMD. The current algorithm also has a decent chance of failing outright due to incorrect handling of the case where the top of the stack is near the top of its PMD. This fixes the implementation. The paxtest estimate of vdso "randomisation" improves from 11 bits to 18 bits. (Disclaimer: I don't know what the paxtest code is actually calculating.) It's worth noting that this algorithm is inherently biased: the vdso is more likely to end up near the end of its PMD than near the beginning. Ideally we would either nix the PMD sharing requirement or jointly randomize the vdso and the stack to reduce the bias. In the mean time, this is a considerable improvement with basically no risk of compatibility issues, since the allowed outputs of the algorithm are unchanged. As an easy test, doing this: for i in `seq 10000` do grep -P vdso /proc/self/maps |cut -d- -f1 done |sort |uniq -d used to produce lots of output (1445 lines on my most recent run). A tiny subset looks like this: 7fffdfffe000 7fffe01fe000 7fffe05fe000 7fffe07fe000 7fffe09fe000 7fffe0bfe000 7fffe0dfe000 Note the suspicious fe000 endings. With the fix, I get a much more palatable 76 repeated addresses. Reviewed-by:
Kees Cook <keescook@chromium.org> Signed-off-by:
Andy Lutomirski <luto@amacapital.net> [bwh: Backported to 3.2: - Adjust context - The whole file is only built for x86_64; adjust comment for this] Signed-off-by:
-
Jan Kara authored
commit 0e5cc9a4 upstream. Symlink reading code does not check whether the resulting path fits into the page provided by the generic code. This isn't as easy as just checking the symlink size because of various encoding conversions we perform on path. So we have to check whether there is still enough space in the buffer on the fly. Reported-by:
-
Jan Kara authored
commit fef2e9f3 upstream. Currently, we ignore symlink component of type 2. But mkisofs and other OS' seem to treat it as / so do the same for compatibility. Reported-by:
"Gábor S." <otnaccess@hotmail.com> Signed-off-by:
-
Jan Kara authored
commit a1d47b26 upstream. UDF specification allows arbitrarily large symlinks. However we support only symlinks at most one block large. Check the length of the symlink so that we don't access memory beyond end of the symlink block. Reported-by:
Carl Henrik Lunde <chlunde@gmail.com> Signed-off-by:
-
Jan Kara authored
commit e159332b upstream. Verify that inode size is sane when loading inode with data stored in ICB. Otherwise we may get confused later when working with the inode and inode size is too big. Reported-by:
-
Jan Kara authored
commit 4e202462 upstream. We didn't check length of rock ridge ER records before printing them. Thus corrupted isofs image can cause us to access and print some memory behind the buffer with obvious consequences. Reported-and-tested-by:
-
Junxiao Bi authored
commit 136f49b9 upstream. For buffer write, page lock will be got in write_begin and released in write_end, in ocfs2_write_end_nolock(), before it unlock the page in ocfs2_free_write_ctxt(), it calls ocfs2_run_deallocs(), this will ask for the read lock of journal->j_trans_barrier. Holding page lock and ask for journal->j_trans_barrier breaks the locking order. This will cause a deadlock with journal commit threads, ocfs2cmt will get write lock of journal->j_trans_barrier first, then it wakes up kjournald2 to do the commit work, at last it waits until done. To commit journal, kjournald2 needs flushing data first, it needs get the cache page lock. Since some ocfs2 cluster locks are holding by write process, this deadlock may hung the whole cluster. unlock pages before ocfs2_run_deallocs() can fix the locking order, also put unlock before ocfs2_commit_trans() to make page lock is unlocked before j_trans_barrier to preserve unlocking order. Signed-off-by:
Junxiao Bi <junxiao.bi@oracle.com> Reviewed-by:
Wengang Wang <wen.gang.wang@oracle.com> Reviewed-by:
Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by:
-
Jiri Jaburek authored
commit d70a1b98 upstream. The Arcam rPAC seems to have the same problem - whenever anything (alsamixer, udevd, 3.9+ kernel from 60af3d03, ..) attempts to access mixer / control interface of the card, the firmware "locks up" the entire device, resulting in SNDRV_PCM_IOCTL_HW_PARAMS failed (-5): Input/output error from alsa-lib. Other operating systems can somehow read the mixer (there seems to be playback volume/mute), but any manipulation is ignored by the device (which has hardware volume controls). Signed-off-by:
Jiri Jaburek <jjaburek@redhat.com> Signed-off-by:
-
Andy Lutomirski authored
commit 3fb2f423 upstream. It turns out that there's a lurking ABI issue. GCC, when compiling this in a 32-bit program: struct user_desc desc = { .entry_number = idx, .base_addr = base, .limit = 0xfffff, .seg_32bit = 1, .contents = 0, /* Data, grow-up */ .read_exec_only = 0, .limit_in_pages = 1, .seg_not_present = 0, .useable = 0, }; will leave .lm uninitialized. This means that anything in the kernel that reads user_desc.lm for 32-bit tasks is unreliable. Revert the .lm check in set_thread_area(). The value never did anything in the first place. Fixes: 0e58af4e ("x86/tls: Disallow unusual TLS segments") Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/d7875b60e28c512f6a6fc0baf5714d58e7eaadbb.1418856405.git.luto@amacapital.netSigned-off-by:
Ingo Molnar <mingo@kernel.org> [bwh: Backported to 3.2: adjust filename] Signed-off-by:
-
Yan, Zheng authored
commit 97c85a82 upstream. Current snaphost code does not properly handle moving inode from one empty snap realm to another empty snap realm. After changing inode's snap realm, some dirty pages' snap context can be not equal to inode's i_head_snap. This can trigger BUG() in ceph_put_wrbuffer_cap_refs() The fix is introduce a global empty snap context for all empty snap realm. This avoids triggering the BUG() for filesystem with no snapshot. Fixes: http://tracker.ceph.com/issues/9928Signed-off-by:
Yan, Zheng <zyan@redhat.com> Reviewed-by:
Ilya Dryomov <idryomov@redhat.com> [bwh: Backported to 3.2: - Adjust context - As we don't have ceph_create_snap_context(), open-code it in ceph_snap_init()] Signed-off-by:
-
Nicholas Bellinger authored
commit 6bf6ca75 upstream. This patch changes iscsit_do_tx_data() to fail on short writes when kernel_sendmsg() returns a value different than requested transfer length, returning -EPIPE and thus causing a connection reset to occur. This avoids a potential bug in the original code where a short write would result in kernel_sendmsg() being called again with the original iovec base + length. In practice this has not been an issue because iscsit_do_tx_data() is only used for transferring 48 byte headers + 4 byte digests, along with seldom used control payloads from NOPIN + TEXT_RSP + REJECT with less than 32k of data. So following Al's audit of iovec consumers, go ahead and fail the connection on short writes for now, and remove the bogus logic ahead of his proper upstream fix. Reported-by:
Al Viro <viro@zeniv.linux.org.uk> Cc: David S. Miller <davem@davemloft.net> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by:
-
Jan Kara authored
commit f54e18f1 upstream. Rock Ridge extensions define so called Continuation Entries (CE) which define where is further space with Rock Ridge data. Corrupted isofs image can contain arbitrarily long chain of these, including a one containing loop and thus causing kernel to end in an infinite loop when traversing these entries. Limit the traversal to 32 entries which should be more than enough space to store all the Rock Ridge data. Reported-by:
P J P <ppandit@redhat.com> Signed-off-by:
-
Andy Lutomirski authored
commit 0e58af4e upstream. Users have no business installing custom code segments into the GDT, and segments that are not present but are otherwise valid are a historical source of interesting attacks. For completeness, block attempts to set the L bit. (Prior to this patch, the L bit would have been silently dropped.) This is an ABI break. I've checked glibc, musl, and Wine, and none of them look like they'll have any trouble. Note to stable maintainers: this is a hardening patch that fixes no known bugs. Given the possibility of ABI issues, this probably shouldn't be backported quickly. Signed-off-by:
H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: security@kernel.org <security@kernel.org> Cc: Willy Tarreau <w@1wt.eu> Signed-off-by:
-
Dan Carpenter authored
commit b5c8afe5 upstream. "origPtr" is used as an offset into the bd->dbuf[] array. That array is allocated in start_bunzip() and has "bd->dbufSize" number of elements so the test here should be >= instead of >. Later we check "origPtr" again before using it as an offset so I don't know if this bug can be triggered in real life. Fixes: bc22c17e ('bzip2/lzma: library support for gzip, bzip2 and lzma decompression') Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Cc: Alain Knaff <alain@knaff.lu> Cc: Yinghai Lu <yinghai@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by:
-
Thomas Gleixner authored
commit c291ee62 upstream. Since the rework of the sparse interrupt code to actually free the unused interrupt descriptors there exists a race between the /proc interfaces to the irq subsystem and the code which frees the interrupt descriptor. CPU0 CPU1 show_interrupts() desc = irq_to_desc(X); free_desc(desc) remove_from_radix_tree(); kfree(desc); raw_spinlock_irq(&desc->lock); /proc/interrupts is the only interface which can actively corrupt kernel memory via the lock access. /proc/stat can only read from freed memory. Extremly hard to trigger, but possible. The interfaces in /proc/irq/N/ are not affected by this because the removal of the proc file is serialized in procfs against concurrent readers/writers. The removal happens before the descriptor is freed. For architectures which have CONFIG_SPARSE_IRQ=n this is a non issue as the descriptor is never freed. It's merely cleared out with the irq descriptor lock held. So any concurrent proc access will either see the old correct value or the cleared out ones. Protect the lookup and access to the irq descriptor in show_interrupts() with the sparse_irq_lock. Provide kstat_irqs_usr() which is protecting the lookup and access with sparse_irq_lock and switch /proc/stat to use it. Document the existing kstat_irqs interfaces so it's clear that the caller needs to take care about protection. The users of these interfaces are either not affected due to SPARSE_IRQ=n or already protected against removal. Fixes: 1f5a5b87 "genirq: Implement a sane sparse_irq allocator" Signed-off-by:
-
Andreas Müller authored
commit d025933e upstream. As multicast-frames can't be fragmented, "dot11MulticastReceivedFrameCount" stopped being incremented after the use-after-free fix. Furthermore, the RX-LED will be triggered by every multicast frame (which wouldn't happen before) which wouldn't allow the LED to rest at all. Fixes https://bugzilla.kernel.org/show_bug.cgi?id=89431 which also had the patch. Fixes: b8fff407 ("mac80211: fix use-after-free in defragmentation") Signed-off-by:
Andreas Müller <goo@stapelspeicher.org> [rewrite commit message] Signed-off-by:
Johannes Berg <johannes.berg@intel.com> Signed-off-by:
-
