Vulnerabilidades

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cpufreq/longhaul: handle NULL policy in longhaul_exit<br /> <br /> longhaul_exit() was calling cpufreq_cpu_get(0) without checking<br /> for a NULL policy pointer. On some systems, this could lead to a<br /> NULL dereference and a kernel warning or panic.<br /> <br /> This patch adds a check using unlikely() and returns early if the<br /> policy is NULL.<br /> <br /> Bugzilla: #219962

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> blk-cgroup: fix possible deadlock while configuring policy<br /> <br /> Following deadlock can be triggered easily by lockdep:<br /> <br /> WARNING: possible circular locking dependency detected<br /> 6.17.0-rc3-00124-ga12c2658ced0 #1665 Not tainted<br /> ------------------------------------------------------<br /> check/1334 is trying to acquire lock:<br /> ff1100011d9d0678 (&amp;q-&gt;sysfs_lock){+.+.}-{4:4}, at: blk_unregister_queue+0x53/0x180<br /> <br /> but task is already holding lock:<br /> ff1100011d9d00e0 (&amp;q-&gt;q_usage_counter(queue)#3){++++}-{0:0}, at: del_gendisk+0xba/0x110<br /> <br /> which lock already depends on the new lock.<br /> <br /> the existing dependency chain (in reverse order) is:<br /> <br /> -&gt; #2 (&amp;q-&gt;q_usage_counter(queue)#3){++++}-{0:0}:<br /> blk_queue_enter+0x40b/0x470<br /> blkg_conf_prep+0x7b/0x3c0<br /> tg_set_limit+0x10a/0x3e0<br /> cgroup_file_write+0xc6/0x420<br /> kernfs_fop_write_iter+0x189/0x280<br /> vfs_write+0x256/0x490<br /> ksys_write+0x83/0x190<br /> __x64_sys_write+0x21/0x30<br /> x64_sys_call+0x4608/0x4630<br /> do_syscall_64+0xdb/0x6b0<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> <br /> -&gt; #1 (&amp;q-&gt;rq_qos_mutex){+.+.}-{4:4}:<br /> __mutex_lock+0xd8/0xf50<br /> mutex_lock_nested+0x2b/0x40<br /> wbt_init+0x17e/0x280<br /> wbt_enable_default+0xe9/0x140<br /> blk_register_queue+0x1da/0x2e0<br /> __add_disk+0x38c/0x5d0<br /> add_disk_fwnode+0x89/0x250<br /> device_add_disk+0x18/0x30<br /> virtblk_probe+0x13a3/0x1800<br /> virtio_dev_probe+0x389/0x610<br /> really_probe+0x136/0x620<br /> __driver_probe_device+0xb3/0x230<br /> driver_probe_device+0x2f/0xe0<br /> __driver_attach+0x158/0x250<br /> bus_for_each_dev+0xa9/0x130<br /> driver_attach+0x26/0x40<br /> bus_add_driver+0x178/0x3d0<br /> driver_register+0x7d/0x1c0<br /> __register_virtio_driver+0x2c/0x60<br /> virtio_blk_init+0x6f/0xe0<br /> do_one_initcall+0x94/0x540<br /> kernel_init_freeable+0x56a/0x7b0<br /> kernel_init+0x2b/0x270<br /> ret_from_fork+0x268/0x4c0<br /> ret_from_fork_asm+0x1a/0x30<br /> <br /> -&gt; #0 (&amp;q-&gt;sysfs_lock){+.+.}-{4:4}:<br /> __lock_acquire+0x1835/0x2940<br /> lock_acquire+0xf9/0x450<br /> __mutex_lock+0xd8/0xf50<br /> mutex_lock_nested+0x2b/0x40<br /> blk_unregister_queue+0x53/0x180<br /> __del_gendisk+0x226/0x690<br /> del_gendisk+0xba/0x110<br /> sd_remove+0x49/0xb0 [sd_mod]<br /> device_remove+0x87/0xb0<br /> device_release_driver_internal+0x11e/0x230<br /> device_release_driver+0x1a/0x30<br /> bus_remove_device+0x14d/0x220<br /> device_del+0x1e1/0x5a0<br /> __scsi_remove_device+0x1ff/0x2f0<br /> scsi_remove_device+0x37/0x60<br /> sdev_store_delete+0x77/0x100<br /> dev_attr_store+0x1f/0x40<br /> sysfs_kf_write+0x65/0x90<br /> kernfs_fop_write_iter+0x189/0x280<br /> vfs_write+0x256/0x490<br /> ksys_write+0x83/0x190<br /> __x64_sys_write+0x21/0x30<br /> x64_sys_call+0x4608/0x4630<br /> do_syscall_64+0xdb/0x6b0<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> <br /> other info that might help us debug this:<br /> <br /> Chain exists of:<br /> &amp;q-&gt;sysfs_lock --&gt; &amp;q-&gt;rq_qos_mutex --&gt; &amp;q-&gt;q_usage_counter(queue)#3<br /> <br /> Possible unsafe locking scenario:<br /> <br /> CPU0 CPU1<br /> ---- ----<br /> lock(&amp;q-&gt;q_usage_counter(queue)#3);<br /> lock(&amp;q-&gt;rq_qos_mutex);<br /> lock(&amp;q-&gt;q_usage_counter(queue)#3);<br /> lock(&amp;q-&gt;sysfs_lock);<br /> <br /> Root cause is that queue_usage_counter is grabbed with rq_qos_mutex<br /> held in blkg_conf_prep(), while queue should be freezed before<br /> rq_qos_mutex from other context.<br /> <br /> The blk_queue_enter() from blkg_conf_prep() is used to protect against<br /> policy deactivation, which is already protected with blkcg_mutex, hence<br /> convert blk_queue_enter() to blkcg_mutex to fix this problem. Meanwhile,<br /> consider that blkcg_mutex is held after queue is freezed from policy<br /> deactivation, also convert blkg_alloc() to use GFP_NOIO.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP<br /> <br /> As reported by Luiz Capitulino enabling HVO on s390 leads to reproducible<br /> crashes. The problem is that kernel page tables are modified without<br /> flushing corresponding TLB entries.<br /> <br /> Even if it looks like the empty flush_tlb_all() implementation on s390 is<br /> the problem, it is actually a different problem: on s390 it is not allowed<br /> to replace an active/valid page table entry with another valid page table<br /> entry without the detour over an invalid entry. A direct replacement may<br /> lead to random crashes and/or data corruption.<br /> <br /> In order to invalidate an entry special instructions have to be used<br /> (e.g. ipte or idte). Alternatively there are also special instructions<br /> available which allow to replace a valid entry with a different valid<br /> entry (e.g. crdte or cspg).<br /> <br /> Given that the HVO code currently does not provide the hooks to allow for<br /> an implementation which is compliant with the s390 architecture<br /> requirements, disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, which is<br /> basically a revert of the original patch which enabled it.

*** Pendiente de traducción *** Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ceph: fix multifs mds auth caps issue<br /> <br /> The mds auth caps check should also validate the<br /> fsname along with the associated caps. Not doing<br /> so would result in applying the mds auth caps of<br /> one fs on to the other fs in a multifs ceph cluster.<br /> The bug causes multiple issues w.r.t user<br /> authentication, following is one such example.<br /> <br /> Steps to Reproduce (on vstart cluster):<br /> 1. Create two file systems in a cluster, say &amp;#39;fsname1&amp;#39; and &amp;#39;fsname2&amp;#39;<br /> 2. Authorize read only permission to the user &amp;#39;client.usr&amp;#39; on fs &amp;#39;fsname1&amp;#39;<br /> $ceph fs authorize fsname1 client.usr / r<br /> 3. Authorize read and write permission to the same user &amp;#39;client.usr&amp;#39; on fs &amp;#39;fsname2&amp;#39;<br /> $ceph fs authorize fsname2 client.usr / rw<br /> 4. Update the keyring<br /> $ceph auth get client.usr &gt;&gt; ./keyring<br /> <br /> With above permssions for the user &amp;#39;client.usr&amp;#39;, following is the<br /> expectation.<br /> a. The &amp;#39;client.usr&amp;#39; should be able to only read the contents<br /> and not allowed to create or delete files on file system &amp;#39;fsname1&amp;#39;.<br /> b. The &amp;#39;client.usr&amp;#39; should be able to read/write on file system &amp;#39;fsname2&amp;#39;.<br /> <br /> But, with this bug, the &amp;#39;client.usr&amp;#39; is allowed to read/write on file<br /> system &amp;#39;fsname1&amp;#39;. See below.<br /> <br /> 5. Mount the file system &amp;#39;fsname1&amp;#39; with the user &amp;#39;client.usr&amp;#39;<br /> $sudo bin/mount.ceph usr@.fsname1=/ /kmnt_fsname1_usr/<br /> 6. Try creating a file on file system &amp;#39;fsname1&amp;#39; with user &amp;#39;client.usr&amp;#39;. This<br /> should fail but passes with this bug.<br /> $touch /kmnt_fsname1_usr/file1<br /> 7. Mount the file system &amp;#39;fsname1&amp;#39; with the user &amp;#39;client.admin&amp;#39; and create a<br /> file.<br /> $sudo bin/mount.ceph admin@.fsname1=/ /kmnt_fsname1_admin<br /> $echo "data" &gt; /kmnt_fsname1_admin/admin_file1<br /> 8. Try removing an existing file on file system &amp;#39;fsname1&amp;#39; with the user<br /> &amp;#39;client.usr&amp;#39;. This shoudn&amp;#39;t succeed but succeeds with the bug.<br /> $rm -f /kmnt_fsname1_usr/admin_file1<br /> <br /> For more information, please take a look at the corresponding mds/fuse patch<br /> and tests added by looking into the tracker mentioned below.<br /> <br /> v2: Fix a possible null dereference in doutc<br /> v3: Don&amp;#39;t store fsname from mdsmap, validate against<br /> ceph_mount_options&amp;#39;s fsname and use it<br /> v4: Code refactor, better warning message and<br /> fix possible compiler warning<br /> <br /> [ Slava.Dubeyko: "fsname check failed" -&gt; "fsname mismatch" ]

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: ipv6: fix field-spanning memcpy warning in AH output<br /> <br /> Fix field-spanning memcpy warnings in ah6_output() and<br /> ah6_output_done() where extension headers are copied to/from IPv6<br /> address fields, triggering fortify-string warnings about writes beyond<br /> the 16-byte address fields.<br /> <br /> memcpy: detected field-spanning write (size 40) of single field "&amp;top_iph-&gt;saddr" at net/ipv6/ah6.c:439 (size 16)<br /> WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439<br /> <br /> The warnings are false positives as the extension headers are<br /> intentionally placed after the IPv6 header in memory. Fix by properly<br /> copying addresses and extension headers separately, and introduce<br /> helper functions to avoid code duplication.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> gpiolib: fix invalid pointer access in debugfs<br /> <br /> If the memory allocation in gpiolib_seq_start() fails, the s-&gt;private<br /> field remains uninitialized and is later dereferenced without checking<br /> in gpiolib_seq_stop(). Initialize s-&gt;private to NULL before calling<br /> kzalloc() and check it before dereferencing it.

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> jfs: fix uninitialized waitqueue in transaction manager<br /> <br /> The transaction manager initialization in txInit() was not properly<br /> initializing TxBlock[0].waitor waitqueue, causing a crash when<br /> txEnd(0) is called on read-only filesystems.<br /> <br /> When a filesystem is mounted read-only, txBegin() returns tid=0 to<br /> indicate no transaction. However, txEnd(0) still gets called and<br /> tries to access TxBlock[0].waitor via tid_to_tblock(0), but this<br /> waitqueue was never initialized because the initialization loop<br /> started at index 1 instead of 0.<br /> <br /> This causes a &amp;#39;non-static key&amp;#39; lockdep warning and system crash:<br /> INFO: trying to register non-static key in txEnd<br /> <br /> Fix by ensuring all transaction blocks including TxBlock[0] have<br /> their waitqueues properly initialized during txInit().

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netpoll: Fix deadlock in memory allocation under spinlock<br /> <br /> Fix a AA deadlock in refill_skbs() where memory allocation while holding<br /> skb_pool-&gt;lock can trigger a recursive lock acquisition attempt.<br /> <br /> The deadlock scenario occurs when the system is under severe memory<br /> pressure:<br /> <br /> 1. refill_skbs() acquires skb_pool-&gt;lock (spinlock)<br /> 2. alloc_skb() is called while holding the lock<br /> 3. Memory allocator fails and calls slab_out_of_memory()<br /> 4. This triggers printk() for the OOM warning<br /> 5. The console output path calls netpoll_send_udp()<br /> 6. netpoll_send_udp() attempts to acquire the same skb_pool-&gt;lock<br /> 7. Deadlock: the lock is already held by the same CPU<br /> <br /> Call stack:<br /> refill_skbs()<br /> spin_lock_irqsave(&amp;skb_pool-&gt;lock) lock)

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/radeon: Do not kfree() devres managed rdev<br /> <br /> Since the allocation of the drivers main structure was changed to<br /> devm_drm_dev_alloc() rdev is managed by devres and we shouldn&amp;#39;t be calling<br /> kfree() on it.<br /> <br /> This fixes things exploding if the driver probe fails and devres cleans up<br /> the rdev after we already free&amp;#39;d it.<br /> <br /> (cherry picked from commit 16c0681617b8a045773d4d87b6140002fa75b03b)

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> x86/fpu: Ensure XFD state on signal delivery<br /> <br /> Sean reported [1] the following splat when running KVM tests:<br /> <br /> WARNING: CPU: 232 PID: 15391 at xfd_validate_state+0x65/0x70<br /> Call Trace:<br /> <br /> fpu__clear_user_states+0x9c/0x100<br /> arch_do_signal_or_restart+0x142/0x210<br /> exit_to_user_mode_loop+0x55/0x100<br /> do_syscall_64+0x205/0x2c0<br /> entry_SYSCALL_64_after_hwframe+0x4b/0x53<br /> <br /> Chao further identified [2] a reproducible scenario involving signal<br /> delivery: a non-AMX task is preempted by an AMX-enabled task which<br /> modifies the XFD MSR.<br /> <br /> When the non-AMX task resumes and reloads XSTATE with init values,<br /> a warning is triggered due to a mismatch between fpstate::xfd and the<br /> CPU&amp;#39;s current XFD state. fpu__clear_user_states() does not currently<br /> re-synchronize the XFD state after such preemption.<br /> <br /> Invoke xfd_update_state() which detects and corrects the mismatch if<br /> there is a dynamic feature.<br /> <br /> This also benefits the sigreturn path, as fpu__restore_sig() may call<br /> fpu__clear_user_states() when the sigframe is inaccessible.<br /> <br /> [ dhansen: minor changelog munging ]

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> platform/mellanox: mlxbf-pmc: add sysfs_attr_init() to count_clock init<br /> <br /> The lock-related debug logic (CONFIG_LOCK_STAT) in the kernel is noting<br /> the following warning when the BlueField-3 SOC is booted:<br /> <br /> BUG: key ffff00008a3402a8 has not been registered!<br /> ------------[ cut here ]------------<br /> DEBUG_LOCKS_WARN_ON(1)<br /> WARNING: CPU: 4 PID: 592 at kernel/locking/lockdep.c:4801 lockdep_init_map_type+0x1d4/0x2a0<br /> <br /> Call trace:<br /> lockdep_init_map_type+0x1d4/0x2a0<br /> __kernfs_create_file+0x84/0x140<br /> sysfs_add_file_mode_ns+0xcc/0x1cc<br /> internal_create_group+0x110/0x3d4<br /> internal_create_groups.part.0+0x54/0xcc<br /> sysfs_create_groups+0x24/0x40<br /> device_add+0x6e8/0x93c<br /> device_register+0x28/0x40<br /> __hwmon_device_register+0x4b0/0x8a0<br /> devm_hwmon_device_register_with_groups+0x7c/0xe0<br /> mlxbf_pmc_probe+0x1e8/0x3e0 [mlxbf_pmc]<br /> platform_probe+0x70/0x110<br /> <br /> The mlxbf_pmc driver must call sysfs_attr_init() during the<br /> initialization of the "count_clock" data structure to avoid<br /> this warning.