CVE-2023-54045

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> audit: fix possible soft lockup in __audit_inode_child()<br /> <br /> Tracefs or debugfs maybe cause hundreds to thousands of PATH records,<br /> too many PATH records maybe cause soft lockup.<br /> <br /> For example:<br /> 1. CONFIG_KASAN=y &amp;&amp; CONFIG_PREEMPTION=n<br /> 2. auditctl -a exit,always -S open -k key<br /> 3. sysctl -w kernel.watchdog_thresh=5<br /> 4. mkdir /sys/kernel/debug/tracing/instances/test<br /> <br /> There may be a soft lockup as follows:<br /> watchdog: BUG: soft lockup - CPU#45 stuck for 7s! [mkdir:15498]<br /> Kernel panic - not syncing: softlockup: hung tasks<br /> Call trace:<br /> dump_backtrace+0x0/0x30c<br /> show_stack+0x20/0x30<br /> dump_stack+0x11c/0x174<br /> panic+0x27c/0x494<br /> watchdog_timer_fn+0x2bc/0x390<br /> __run_hrtimer+0x148/0x4fc<br /> __hrtimer_run_queues+0x154/0x210<br /> hrtimer_interrupt+0x2c4/0x760<br /> arch_timer_handler_phys+0x48/0x60<br /> handle_percpu_devid_irq+0xe0/0x340<br /> __handle_domain_irq+0xbc/0x130<br /> gic_handle_irq+0x78/0x460<br /> el1_irq+0xb8/0x140<br /> __audit_inode_child+0x240/0x7bc<br /> tracefs_create_file+0x1b8/0x2a0<br /> trace_create_file+0x18/0x50<br /> event_create_dir+0x204/0x30c<br /> __trace_add_new_event+0xac/0x100<br /> event_trace_add_tracer+0xa0/0x130<br /> trace_array_create_dir+0x60/0x140<br /> trace_array_create+0x1e0/0x370<br /> instance_mkdir+0x90/0xd0<br /> tracefs_syscall_mkdir+0x68/0xa0<br /> vfs_mkdir+0x21c/0x34c<br /> do_mkdirat+0x1b4/0x1d4<br /> __arm64_sys_mkdirat+0x4c/0x60<br /> el0_svc_common.constprop.0+0xa8/0x240<br /> do_el0_svc+0x8c/0xc0<br /> el0_svc+0x20/0x30<br /> el0_sync_handler+0xb0/0xb4<br /> el0_sync+0x160/0x180<br /> <br /> Therefore, we add cond_resched() to __audit_inode_child() to fix it.