CVE-2022-49062

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cachefiles: Fix KASAN slab-out-of-bounds in cachefiles_set_volume_xattr<br /> <br /> Use the actual length of volume coherency data when setting the<br /> xattr to avoid the following KASAN report.<br /> <br /> BUG: KASAN: slab-out-of-bounds in cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles]<br /> Write of size 4 at addr ffff888101e02af4 by task kworker/6:0/1347<br /> <br /> CPU: 6 PID: 1347 Comm: kworker/6:0 Kdump: loaded Not tainted 5.18.0-rc1-nfs-fscache-netfs+ #13<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-4.fc34 04/01/2014<br /> Workqueue: events fscache_create_volume_work [fscache]<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x45/0x5a<br /> print_report.cold+0x5e/0x5db<br /> ? __lock_text_start+0x8/0x8<br /> ? cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles]<br /> kasan_report+0xab/0x120<br /> ? cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles]<br /> kasan_check_range+0xf5/0x1d0<br /> memcpy+0x39/0x60<br /> cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles]<br /> cachefiles_acquire_volume+0x2be/0x500 [cachefiles]<br /> ? __cachefiles_free_volume+0x90/0x90 [cachefiles]<br /> fscache_create_volume_work+0x68/0x160 [fscache]<br /> process_one_work+0x3b7/0x6a0<br /> worker_thread+0x2c4/0x650<br /> ? process_one_work+0x6a0/0x6a0<br /> kthread+0x16c/0x1a0<br /> ? kthread_complete_and_exit+0x20/0x20<br /> ret_from_fork+0x22/0x30<br /> <br /> <br /> Allocated by task 1347:<br /> kasan_save_stack+0x1e/0x40<br /> __kasan_kmalloc+0x81/0xa0<br /> cachefiles_set_volume_xattr+0x76/0x350 [cachefiles]<br /> cachefiles_acquire_volume+0x2be/0x500 [cachefiles]<br /> fscache_create_volume_work+0x68/0x160 [fscache]<br /> process_one_work+0x3b7/0x6a0<br /> worker_thread+0x2c4/0x650<br /> kthread+0x16c/0x1a0<br /> ret_from_fork+0x22/0x30<br /> <br /> The buggy address belongs to the object at ffff888101e02af0<br /> which belongs to the cache kmalloc-8 of size 8<br /> The buggy address is located 4 bytes inside of<br /> 8-byte region [ffff888101e02af0, ffff888101e02af8)<br /> <br /> The buggy address belongs to the physical page:<br /> page:00000000a2292d70 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101e02<br /> flags: 0x17ffffc0000200(slab|node=0|zone=2|lastcpupid=0x1fffff)<br /> raw: 0017ffffc0000200 0000000000000000 dead000000000001 ffff888100042280<br /> raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000<br /> page dumped because: kasan: bad access detected<br /> <br /> Memory state around the buggy address:<br /> ffff888101e02980: fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc<br /> ffff888101e02a00: 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00<br /> &gt;ffff888101e02a80: fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 04 fc<br /> ^<br /> ffff888101e02b00: fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc<br /> ffff888101e02b80: fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc<br /> ==================================================================