CVE-2023-54132

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> erofs: stop parsing non-compact HEAD index if clusterofs is invalid<br /> <br /> Syzbot generated a crafted image [1] with a non-compact HEAD index of<br /> clusterofs 33024 while valid numbers should be 0 ~ lclustersize-1,<br /> which causes the following unexpected behavior as below:<br /> <br /> BUG: unable to handle page fault for address: fffff52101a3fff9<br /> #PF: supervisor read access in kernel mode<br /> #PF: error_code(0x0000) - not-present page<br /> PGD 23ffed067 P4D 23ffed067 PUD 0<br /> Oops: 0000 [#1] PREEMPT SMP KASAN<br /> CPU: 1 PID: 4398 Comm: kworker/u5:1 Not tainted 6.3.0-rc6-syzkaller-g09a9639e56c0 #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023<br /> Workqueue: erofs_worker z_erofs_decompressqueue_work<br /> RIP: 0010:z_erofs_decompress_queue+0xb7e/0x2b40<br /> ...<br /> Call Trace:<br /> <br /> z_erofs_decompressqueue_work+0x99/0xe0<br /> process_one_work+0x8f6/0x1170<br /> worker_thread+0xa63/0x1210<br /> kthread+0x270/0x300<br /> ret_from_fork+0x1f/0x30<br /> <br /> Note that normal images or images using compact indexes are not<br /> impacted. Let&amp;#39;s fix this now.<br /> <br /> [1] https://lore.kernel.org/r/000000000000ec75b005ee97fbaa@google.com