Description
In the Linux kernel, the following vulnerability has been resolved: ubi: Fix use-after-free when volume resizing failed There is an use-after-free problem reported by KASAN: ================================================================== BUG: KASAN: use-after-free in ubi_eba_copy_table+0x11f/0x1c0 [ubi] Read of size 8 at addr ffff888101eec008 by task ubirsvol/4735 CPU: 2 PID: 4735 Comm: ubirsvol Not tainted 6.1.0-rc1-00003-g84fa3304a7fc-dirty #14 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 print_report+0x171/0x472 kasan_report+0xad/0x130 ubi_eba_copy_table+0x11f/0x1c0 [ubi] ubi_resize_volume+0x4f9/0xbc0 [ubi] ubi_cdev_ioctl+0x701/0x1850 [ubi] __x64_sys_ioctl+0x11d/0x170 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 </TASK> When ubi_change_vtbl_record() returns an error in ubi_resize_volume(), "new_eba_tbl" will be freed on error handing path, but it is holded by "vol->eba_tbl" in ubi_eba_replace_table(). It means that the liftcycle of "vol->eba_tbl" and "vol" are different, so when resizing volume in next time, it causing an use-after-free fault. Fix it by not freeing "new_eba_tbl" after it replaced in ubi_eba_replace_table(), while will be freed in next volume resizing.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
801c135ce73d5df1caf3eca35b66a10824ae0707 to < bf9875aa7f7d624a8c084425b14bf7e5907ebc30affected801c135ce73d5df1caf3eca35b66a10824ae0707 to < bf795ebbb9995e2fe7945de71177f01c2f1215dcaffected801c135ce73d5df1caf3eca35b66a10824ae0707 to < 9c8be1f165baee53b5a36ea0b3c9281d403a1d0baffected801c135ce73d5df1caf3eca35b66a10824ae0707 to < 35f8d4064e54c18424db2997059d4c0b1d13d093affected801c135ce73d5df1caf3eca35b66a10824ae0707 to < 53818746e549e61841428892a8d94344494be797affected801c135ce73d5df1caf3eca35b66a10824ae0707 to < b0c951742348d216f094d16ed4f70ae73db881c0affected801c135ce73d5df1caf3eca35b66a10824ae0707 to < 3d6378f7056ac7350338f941001162a8f660853caffected801c135ce73d5df1caf3eca35b66a10824ae0707 to < 9af31d6ec1a4be4caab2550096c6bd2ba8fba472affected
Linux Linux
Default version status: affected
2.6.22affected0 to < 2.6.22unaffected4.14.308 to ≤ 4.14.*unaffected4.19.276 to ≤ 4.19.*unaffected5.4.235 to ≤ 5.4.*unaffected5.10.173 to ≤ 5.10.*unaffected5.15.100 to ≤ 5.15.*unaffected6.1.18 to ≤ 6.1.*unaffected6.2.5 to ≤ 6.2.*unaffected6.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30 ↗
- https://git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dc ↗
- https://git.kernel.org/stable/c/9c8be1f165baee53b5a36ea0b3c9281d403a1d0b ↗
- https://git.kernel.org/stable/c/35f8d4064e54c18424db2997059d4c0b1d13d093 ↗
- https://git.kernel.org/stable/c/53818746e549e61841428892a8d94344494be797 ↗
- https://git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0 ↗
- https://git.kernel.org/stable/c/3d6378f7056ac7350338f941001162a8f660853c ↗
- https://git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472 ↗