CVE-2023-52560

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()<br /> <br /> When CONFIG_DAMON_VADDR_KUNIT_TEST=y and making CONFIG_DEBUG_KMEMLEAK=y<br /> and CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y, the below memory leak is detected.<br /> <br /> Since commit 9f86d624292c ("mm/damon/vaddr-test: remove unnecessary<br /> variables"), the damon_destroy_ctx() is removed, but still call<br /> damon_new_target() and damon_new_region(), the damon_region which is<br /> allocated by kmem_cache_alloc() in damon_new_region() and the damon_target<br /> which is allocated by kmalloc in damon_new_target() are not freed. And<br /> the damon_region which is allocated in damon_new_region() in<br /> damon_set_regions() is also not freed.<br /> <br /> So use damon_destroy_target to free all the damon_regions and damon_target.<br /> <br /> unreferenced object 0xffff888107c9a940 (size 64):<br /> comm "kunit_try_catch", pid 1069, jiffies 4294670592 (age 732.761s)<br /> hex dump (first 32 bytes):<br /> 00 00 00 00 00 00 00 00 06 00 00 00 6b 6b 6b 6b ............kkkk<br /> 60 c7 9c 07 81 88 ff ff f8 cb 9c 07 81 88 ff ff `...............<br /> backtrace:<br /> [] kmalloc_trace+0x27/0xa0<br /> [] damon_new_target+0x3f/0x1b0<br /> [] damon_do_test_apply_three_regions.constprop.0+0x95/0x3e0<br /> [] damon_test_apply_three_regions1+0x21e/0x260<br /> [] kunit_generic_run_threadfn_adapter+0x4a/0x90<br /> [] kthread+0x2b6/0x380<br /> [] ret_from_fork+0x2d/0x70<br /> [] ret_from_fork_asm+0x11/0x20<br /> unreferenced object 0xffff8881079cc740 (size 56):<br /> comm "kunit_try_catch", pid 1069, jiffies 4294670592 (age 732.761s)<br /> hex dump (first 32 bytes):<br /> 05 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00 ................<br /> 6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b kkkkkkkk....kkkk<br /> backtrace:<br /> [] damon_new_region+0x22/0x1c0<br /> [] damon_do_test_apply_three_regions.constprop.0+0xd1/0x3e0<br /> [] damon_test_apply_three_regions1+0x21e/0x260<br /> [] kunit_generic_run_threadfn_adapter+0x4a/0x90<br /> [] kthread+0x2b6/0x380<br /> [] ret_from_fork+0x2d/0x70<br /> [] ret_from_fork_asm+0x11/0x20<br /> unreferenced object 0xffff888107c9ac40 (size 64):<br /> comm "kunit_try_catch", pid 1071, jiffies 4294670595 (age 732.843s)<br /> hex dump (first 32 bytes):<br /> 00 00 00 00 00 00 00 00 06 00 00 00 6b 6b 6b 6b ............kkkk<br /> a0 cc 9c 07 81 88 ff ff 78 a1 76 07 81 88 ff ff ........x.v.....<br /> backtrace:<br /> [] kmalloc_trace+0x27/0xa0<br /> [] damon_new_target+0x3f/0x1b0<br /> [] damon_do_test_apply_three_regions.constprop.0+0x95/0x3e0<br /> [] damon_test_apply_three_regions2+0x21e/0x260<br /> [] kunit_generic_run_threadfn_adapter+0x4a/0x90<br /> [] kthread+0x2b6/0x380<br /> [] ret_from_fork+0x2d/0x70<br /> [] ret_from_fork_asm+0x11/0x20<br /> unreferenced object 0xffff8881079ccc80 (size 56):<br /> comm "kunit_try_catch", pid 1071, jiffies 4294670595 (age 732.843s)<br /> hex dump (first 32 bytes):<br /> 05 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00 ................<br /> 6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b kkkkkkkk....kkkk<br /> backtrace:<br /> [] damon_new_region+0x22/0x1c0<br /> [] damon_do_test_apply_three_regions.constprop.0+0xd1/0x3e0<br /> [] damon_test_apply_three_regions2+0x21e/0x260<br /> [] kunit_generic_run_threadfn_adapter+0x4a/0x90<br /> [] kthread+0x2b6/0x380<br /> [] ret_from_fork+0x2d/0x70<br /> [