Vulnerabilidades

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd: fix potential memory leak<br /> <br /> This patch fix potential memory leak (clk_src) when function run<br /> into last return NULL.<br /> <br /> s/free/kfree/ - Alex

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nilfs2: fix shift-out-of-bounds/overflow in nilfs_sb2_bad_offset()<br /> <br /> Patch series "nilfs2: fix UBSAN shift-out-of-bounds warnings on mount<br /> time".<br /> <br /> The first patch fixes a bug reported by syzbot, and the second one fixes<br /> the remaining bug of the same kind. Although they are triggered by the<br /> same super block data anomaly, I divided it into the above two because the<br /> details of the issues and how to fix it are different.<br /> <br /> Both are required to eliminate the shift-out-of-bounds issues at mount<br /> time.<br /> <br /> <br /> This patch (of 2):<br /> <br /> If the block size exponent information written in an on-disk superblock is<br /> corrupted, nilfs_sb2_bad_offset helper function can trigger<br /> shift-out-of-bounds warning followed by a kernel panic (if panic_on_warn<br /> is set):<br /> <br /> shift exponent 38983 is too large for 64-bit type &amp;#39;unsigned long long&amp;#39;<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:88 [inline]<br /> dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106<br /> ubsan_epilogue lib/ubsan.c:151 [inline]<br /> __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322<br /> nilfs_sb2_bad_offset fs/nilfs2/the_nilfs.c:449 [inline]<br /> nilfs_load_super_block+0xdf5/0xe00 fs/nilfs2/the_nilfs.c:523<br /> init_nilfs+0xb7/0x7d0 fs/nilfs2/the_nilfs.c:577<br /> nilfs_fill_super+0xb1/0x5d0 fs/nilfs2/super.c:1047<br /> nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317<br /> ...<br /> <br /> In addition, since nilfs_sb2_bad_offset() performs multiplication without<br /> considering the upper bound, the computation may overflow if the disk<br /> layout parameters are not normal.<br /> <br /> This fixes these issues by inserting preliminary sanity checks for those<br /> parameters and by converting the comparison from one involving<br /> multiplication and left bit-shifting to one using division and right<br /> bit-shifting.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> memory: pl353-smc: Fix refcount leak bug in pl353_smc_probe()<br /> <br /> The break of for_each_available_child_of_node() needs a<br /> corresponding of_node_put() when the reference &amp;#39;child&amp;#39; is not<br /> used anymore. Here we do not need to call of_node_put() in<br /> fail path as &amp;#39;!match&amp;#39; means no break.<br /> <br /> While the of_platform_device_create() will created a new<br /> reference by &amp;#39;child&amp;#39; but it has considered the refcounting.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cxl: fix possible null-ptr-deref in cxl_guest_init_afu|adapter()<br /> <br /> If device_register() fails in cxl_register_afu|adapter(), the device<br /> is not added, device_unregister() can not be called in the error path,<br /> otherwise it will cause a null-ptr-deref because of removing not added<br /> device.<br /> <br /> As comment of device_register() says, it should use put_device() to give<br /> up the reference in the error path. So split device_unregister() into<br /> device_del() and put_device(), then goes to put dev when register fails.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iommu/vt-d: Clean up si_domain in the init_dmars() error path<br /> <br /> A splat from kmem_cache_destroy() was seen with a kernel prior to<br /> commit ee2653bbe89d ("iommu/vt-d: Remove domain and devinfo mempool")<br /> when there was a failure in init_dmars(), because the iommu_domain<br /> cache still had objects. While the mempool code is now gone, there<br /> still is a leak of the si_domain memory if init_dmars() fails. So<br /> clean up si_domain in the init_dmars() error path.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> macintosh: fix possible memory leak in macio_add_one_device()<br /> <br /> Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device&amp;#39;s<br /> bus_id string array"), the name of device is allocated dynamically. It<br /> needs to be freed when of_device_register() fails. Call put_device() to<br /> give up the reference that&amp;#39;s taken in device_initialize(), so that it<br /> can be freed in kobject_cleanup() when the refcount hits 0.<br /> <br /> macio device is freed in macio_release_dev(), so the kfree() can be<br /> removed.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cpufreq: Init completion before kobject_init_and_add()<br /> <br /> In cpufreq_policy_alloc(), it will call uninitialed completion in<br /> cpufreq_sysfs_release() when kobject_init_and_add() fails. And<br /> that will cause a crash such as the following page fault in complete:<br /> <br /> BUG: unable to handle page fault for address: fffffffffffffff8<br /> [..]<br /> RIP: 0010:complete+0x98/0x1f0<br /> [..]<br /> Call Trace:<br /> kobject_put+0x1be/0x4c0<br /> cpufreq_online.cold+0xee/0x1fd<br /> cpufreq_add_dev+0x183/0x1e0<br /> subsys_interface_register+0x3f5/0x4e0<br /> cpufreq_register_driver+0x3b7/0x670<br /> acpi_cpufreq_init+0x56c/0x1000 [acpi_cpufreq]<br /> do_one_initcall+0x13d/0x780<br /> do_init_module+0x1c3/0x630<br /> load_module+0x6e67/0x73b0<br /> __do_sys_finit_module+0x181/0x240<br /> do_syscall_64+0x35/0x80<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> IB/mad: Don&amp;#39;t call to function that might sleep while in atomic context<br /> <br /> Tracepoints are not allowed to sleep, as such the following splat is<br /> generated due to call to ib_query_pkey() in atomic context.<br /> <br /> WARNING: CPU: 0 PID: 1888000 at kernel/trace/ring_buffer.c:2492 rb_commit+0xc1/0x220<br /> CPU: 0 PID: 1888000 Comm: kworker/u9:0 Kdump: loaded Tainted: G OE --------- - - 4.18.0-305.3.1.el8.x86_64 #1<br /> Hardware name: Red Hat KVM, BIOS 1.13.0-2.module_el8.3.0+555+a55c8938 04/01/2014<br /> Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core]<br /> RIP: 0010:rb_commit+0xc1/0x220<br /> RSP: 0000:ffffa8ac80f9bca0 EFLAGS: 00010202<br /> RAX: ffff8951c7c01300 RBX: ffff8951c7c14a00 RCX: 0000000000000246<br /> RDX: ffff8951c707c000 RSI: ffff8951c707c57c RDI: ffff8951c7c14a00<br /> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000<br /> R10: ffff8951c7c01300 R11: 0000000000000001 R12: 0000000000000246<br /> R13: 0000000000000000 R14: ffffffff964c70c0 R15: 0000000000000000<br /> FS: 0000000000000000(0000) GS:ffff8951fbc00000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 00007f20e8f39010 CR3: 000000002ca10005 CR4: 0000000000170ef0<br /> Call Trace:<br /> ring_buffer_unlock_commit+0x1d/0xa0<br /> trace_buffer_unlock_commit_regs+0x3b/0x1b0<br /> trace_event_buffer_commit+0x67/0x1d0<br /> trace_event_raw_event_ib_mad_recv_done_handler+0x11c/0x160 [ib_core]<br /> ib_mad_recv_done+0x48b/0xc10 [ib_core]<br /> ? trace_event_raw_event_cq_poll+0x6f/0xb0 [ib_core]<br /> __ib_process_cq+0x91/0x1c0 [ib_core]<br /> ib_cq_poll_work+0x26/0x80 [ib_core]<br /> process_one_work+0x1a7/0x360<br /> ? create_worker+0x1a0/0x1a0<br /> worker_thread+0x30/0x390<br /> ? create_worker+0x1a0/0x1a0<br /> kthread+0x116/0x130<br /> ? kthread_flush_work_fn+0x10/0x10<br /> ret_from_fork+0x35/0x40<br /> ---[ end trace 78ba8509d3830a16 ]---

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> xen/gntdev: Accommodate VMA splitting<br /> <br /> Prior to this commit, the gntdev driver code did not handle the<br /> following scenario correctly with paravirtualized (PV) Xen domains:<br /> <br /> * User process sets up a gntdev mapping composed of two grant mappings<br /> (i.e., two pages shared by another Xen domain).<br /> * User process munmap()s one of the pages.<br /> * User process munmap()s the remaining page.<br /> * User process exits.<br /> <br /> In the scenario above, the user process would cause the kernel to log<br /> the following messages in dmesg for the first munmap(), and the second<br /> munmap() call would result in similar log messages:<br /> <br /> BUG: Bad page map in process doublemap.test pte:... pmd:...<br /> page:0000000057c97bff refcount:1 mapcount:-1 \<br /> mapping:0000000000000000 index:0x0 pfn:...<br /> ...<br /> page dumped because: bad pte<br /> ...<br /> file:gntdev fault:0x0 mmap:gntdev_mmap [xen_gntdev] readpage:0x0<br /> ...<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x46/0x5e<br /> print_bad_pte.cold+0x66/0xb6<br /> unmap_page_range+0x7e5/0xdc0<br /> unmap_vmas+0x78/0xf0<br /> unmap_region+0xa8/0x110<br /> __do_munmap+0x1ea/0x4e0<br /> __vm_munmap+0x75/0x120<br /> __x64_sys_munmap+0x28/0x40<br /> do_syscall_64+0x38/0x90<br /> entry_SYSCALL_64_after_hwframe+0x61/0xcb<br /> ...<br /> <br /> For each munmap() call, the Xen hypervisor (if built with CONFIG_DEBUG)<br /> would print out the following and trigger a general protection fault in<br /> the affected Xen PV domain:<br /> <br /> (XEN) d0v... Attempt to implicitly unmap d0&amp;#39;s grant PTE ...<br /> (XEN) d0v... Attempt to implicitly unmap d0&amp;#39;s grant PTE ...<br /> <br /> As of this writing, gntdev_grant_map structure&amp;#39;s vma field (referred to<br /> as map-&gt;vma below) is mainly used for checking the start and end<br /> addresses of mappings. However, with split VMAs, these may change, and<br /> there could be more than one VMA associated with a gntdev mapping.<br /> Hence, remove the use of map-&gt;vma and rely on map-&gt;pages_vm_start for<br /> the original start address and on (map-&gt;count live_grants atomic counter and/or the map-&gt;vma<br /> pointer (the latter of which is now removed). This prevents the<br /> userspace from mmap()&amp;#39;ing (with MAP_FIXED) a gntdev mapping over the<br /> same address range as a previously set up gntdev mapping. This scenario<br /> can be summarized with the following call-trace, which was valid prior<br /> to this commit:<br /> <br /> mmap<br /> gntdev_mmap<br /> mmap (repeat mmap with MAP_FIXED over the same address range)<br /> gntdev_invalidate<br /> unmap_grant_pages (sets &amp;#39;being_removed&amp;#39; entries to true)<br /> gnttab_unmap_refs_async<br /> unmap_single_vma<br /> gntdev_mmap (maps the shared pages again)<br /> munmap<br /> gntdev_invalidate<br /> unmap_grant_pages<br /> (no-op because &amp;#39;being_removed&amp;#39; entries are true)<br /> unmap_single_vma (For PV domains, Xen reports that a granted page<br /> is being unmapped and triggers a general protection fault in the<br /> affected domain, if Xen was built with CONFIG_DEBUG)<br /> <br /> The fix for this last scenario could be worth its own commit, but we<br /> opted for a single commit, because removing the gntdev_grant_map<br /> structure&amp;#39;s vma field requires guarding the entry to gntdev_mmap(), and<br /> the live_grants atomic counter is not sufficient on its own to prevent<br /> the mmap() over a pre-existing mapping.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> xhci: Remove device endpoints from bandwidth list when freeing the device<br /> <br /> Endpoints are normally deleted from the bandwidth list when they are<br /> dropped, before the virt device is freed.<br /> <br /> If xHC host is dying or being removed then the endpoints aren&amp;#39;t dropped<br /> cleanly due to functions returning early to avoid interacting with a<br /> non-accessible host controller.<br /> <br /> So check and delete endpoints that are still on the bandwidth list when<br /> freeing the virt device.<br /> <br /> Solves a list_del corruption kernel crash when unbinding xhci-pci,<br /> caused by xhci_mem_cleanup() when it later tried to delete already freed<br /> endpoints from the bandwidth list.<br /> <br /> This only affects hosts that use software bandwidth checking, which<br /> currenty is only the xHC in intel Panther Point PCH (Ivy Bridge)

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cgroup: split cgroup_destroy_wq into 3 workqueues<br /> <br /> A hung task can occur during [1] LTP cgroup testing when repeatedly<br /> mounting/unmounting perf_event and net_prio controllers with<br /> systemd.unified_cgroup_hierarchy=1. The hang manifests in<br /> cgroup_lock_and_drain_offline() during root destruction.<br /> <br /> Related case:<br /> cgroup_fj_function_perf_event cgroup_fj_function.sh perf_event<br /> cgroup_fj_function_net_prio cgroup_fj_function.sh net_prio<br /> <br /> Call Trace:<br /> cgroup_lock_and_drain_offline+0x14c/0x1e8<br /> cgroup_destroy_root+0x3c/0x2c0<br /> css_free_rwork_fn+0x248/0x338<br /> process_one_work+0x16c/0x3b8<br /> worker_thread+0x22c/0x3b0<br /> kthread+0xec/0x100<br /> ret_from_fork+0x10/0x20<br /> <br /> Root Cause:<br /> <br /> CPU0 CPU1<br /> mount perf_event umount net_prio<br /> cgroup1_get_tree cgroup_kill_sb<br /> rebind_subsystems // root destruction enqueues<br /> // cgroup_destroy_wq<br /> // kill all perf_event css<br /> // one perf_event css A is dying<br /> // css A offline enqueues cgroup_destroy_wq<br /> // root destruction will be executed first<br /> css_free_rwork_fn<br /> cgroup_destroy_root<br /> cgroup_lock_and_drain_offline<br /> // some perf descendants are dying<br /> // cgroup_destroy_wq max_active = 1<br /> // waiting for css A to die<br /> <br /> Problem scenario:<br /> 1. CPU0 mounts perf_event (rebind_subsystems)<br /> 2. CPU1 unmounts net_prio (cgroup_kill_sb), queuing root destruction work<br /> 3. A dying perf_event CSS gets queued for offline after root destruction<br /> 4. Root destruction waits for offline completion, but offline work is<br /> blocked behind root destruction in cgroup_destroy_wq (max_active=1)<br /> <br /> Solution:<br /> Split cgroup_destroy_wq into three dedicated workqueues:<br /> cgroup_offline_wq – Handles CSS offline operations<br /> cgroup_release_wq – Manages resource release<br /> cgroup_free_wq – Performs final memory deallocation<br /> <br /> This separation eliminates blocking in the CSS free path while waiting for<br /> offline operations to complete.<br /> <br /> [1] https://github.com/linux-test-project/ltp/blob/master/runtest/controllers

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: wilc1000: avoid buffer overflow in WID string configuration<br /> <br /> Fix the following copy overflow warning identified by Smatch checker.<br /> <br /> drivers/net/wireless/microchip/wilc1000/wlan_cfg.c:184 wilc_wlan_parse_response_frame()<br /> error: &amp;#39;__memcpy()&amp;#39; &amp;#39;cfg-&gt;s[i]-&gt;str&amp;#39; copy overflow (512 vs 65537)<br /> <br /> This patch introduces size check before accessing the memory buffer.<br /> The checks are base on the WID type of received data from the firmware.<br /> For WID string configuration, the size limit is determined by individual<br /> element size in &amp;#39;struct wilc_cfg_str_vals&amp;#39; that is maintained in &amp;#39;len&amp;#39; field<br /> of &amp;#39;struct wilc_cfg_str&amp;#39;.