CVE-2023-53747

In the Linux kernel, the following vulnerability has been resolved:

vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF

After a call to console_unlock() in vcs_write() the vc_data struct can be

freed by vc_port_destruct(). Because of that, the struct vc_data pointer

must be reloaded in the while loop in vcs_write() after console_lock() to

avoid a UAF when vcs_size() is called.

Syzkaller reported a UAF in vcs_size().

BUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)

Read of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119

Call Trace:

<TASK>

__asan_report_load4_noabort (mm/kasan/report_generic.c:380)

vcs_size (drivers/tty/vt/vc_screen.c:215)

vcs_write (drivers/tty/vt/vc_screen.c:664)

vfs_write (fs/read_write.c:582 fs/read_write.c:564)

...

<TASK>

Allocated by task 1213:

kmalloc_trace (mm/slab_common.c:1064)

vc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680

drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058)

con_install (drivers/tty/vt/vt.c:3334)

tty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415

drivers/tty/tty_io.c:1392)

tty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128)

chrdev_open (fs/char_dev.c:415)

do_dentry_open (fs/open.c:921)

vfs_open (fs/open.c:1052)

...

Freed by task 4116:

kfree (mm/slab_common.c:1016)

vc_port_destruct (drivers/tty/vt/vt.c:1044)

tty_port_destructor (drivers/tty/tty_port.c:296)

tty_port_put (drivers/tty/tty_port.c:312)

vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))

vt_ioctl (drivers/tty/vt/vt_ioctl.c:903)

tty_ioctl (drivers/tty/tty_io.c:2778)

...

The buggy address belongs to the object at ffff8880beab8800

which belongs to the cache kmalloc-1k of size 1024

The buggy address is located 424 bytes inside of

freed 1024-byte region [ffff8880beab8800, ffff8880beab8c00)

The buggy address belongs to the physical page:

page:00000000afc77580 refcount:1 mapcount:0 mapping:0000000000000000

index:0x0 pfn:0xbeab8

head:00000000afc77580 order:3 entire_mapcount:0 nr_pages_mapped:0

pincount:0

flags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff)

page_type: 0xffffffff()

raw: 000fffffc0010200 ffff888100042dc0 ffffea000426de00 dead000000000002

raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff8880beab8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

ffff8880beab8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

>ffff8880beab8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

^

ffff8880beab8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

ffff8880beab8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

==================================================================

Disabling lock debugging due to kernel taint