CVE-2023-53375

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tracing: Free error logs of tracing instances<br /> <br /> When a tracing instance is removed, the error messages that hold errors<br /> that occurred in the instance needs to be freed. The following reports a<br /> memory leak:<br /> <br /> # cd /sys/kernel/tracing<br /> # mkdir instances/foo<br /> # echo &amp;#39;hist:keys=x&amp;#39; &gt; instances/foo/events/sched/sched_switch/trigger<br /> # cat instances/foo/error_log<br /> [ 117.404795] hist:sched:sched_switch: error: Couldn&amp;#39;t find field<br /> Command: hist:keys=x<br /> ^<br /> # rmdir instances/foo<br /> <br /> Then check for memory leaks:<br /> <br /> # echo scan &gt; /sys/kernel/debug/kmemleak<br /> # cat /sys/kernel/debug/kmemleak<br /> unreferenced object 0xffff88810d8ec700 (size 192):<br /> comm "bash", pid 869, jiffies 4294950577 (age 215.752s)<br /> hex dump (first 32 bytes):<br /> 60 dd 68 61 81 88 ff ff 60 dd 68 61 81 88 ff ff `.ha....`.ha....<br /> a0 30 8c 83 ff ff ff ff 26 00 0a 00 00 00 00 00 .0......&amp;.......<br /> backtrace:<br /> [] kmalloc_trace+0x2a/0xa0<br /> [] tracing_log_err+0x277/0x2e0<br /> [] parse_atom+0x966/0xb40<br /> [] parse_expr+0x5f3/0xdb0<br /> [] event_hist_trigger_parse+0x27f8/0x3560<br /> [] trigger_process_regex+0x135/0x1a0<br /> [] event_trigger_write+0x87/0xf0<br /> [] vfs_write+0x162/0x670<br /> [] ksys_write+0xca/0x170<br /> [] do_syscall_64+0x3e/0xc0<br /> [] entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> unreferenced object 0xffff888170c35a00 (size 32):<br /> comm "bash", pid 869, jiffies 4294950577 (age 215.752s)<br /> hex dump (first 32 bytes):<br /> 0a 20 20 43 6f 6d 6d 61 6e 64 3a 20 68 69 73 74 . Command: hist<br /> 3a 6b 65 79 73 3d 78 0a 00 00 00 00 00 00 00 00 :keys=x.........<br /> backtrace:<br /> [] __kmalloc+0x4d/0x160<br /> [] tracing_log_err+0x29b/0x2e0<br /> [] parse_atom+0x966/0xb40<br /> [] parse_expr+0x5f3/0xdb0<br /> [] event_hist_trigger_parse+0x27f8/0x3560<br /> [] trigger_process_regex+0x135/0x1a0<br /> [] event_trigger_write+0x87/0xf0<br /> [] vfs_write+0x162/0x670<br /> [] ksys_write+0xca/0x170<br /> [] do_syscall_64+0x3e/0xc0<br /> [] entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> <br /> The problem is that the error log needs to be freed when the instance is<br /> removed.