CVE-2024-53049

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

slub/kunit: fix a WARNING due to unwrapped _kmalloccache_noprof

'modprobe slubkunit' will have a warning as shown below. The root cause is that _kmalloccachenoprof was directly used, which resulted in no alloctag being allocated. This caused current->alloctag to be null, leading to a warning in alloctagadd_check.

Let's add an allochook layer to _kmalloccachenoprof specifically within lib/slub_kunit.c, which is the only user of this internal slub function outside kmalloc implementation itself.

[58162.947016] WARNING: CPU: 2 PID: 6210 at ./include/linux/alloctag.h:125 alloctaggingslaballochook+0x268/0x27c [58162.957721] Call trace: [58162.957919] alloctaggingslaballochook+0x268/0x27c [58162.958286] _kmalloccachenoprof+0x14c/0x344 [58162.958615] testkmallocredzoneaccess+0x50/0x10c [slubkunit] [58162.959045] kunittryruncase+0x74/0x184 [kunit] [58162.959401] kunitgenericrunthreadfnadapter+0x2c/0x4c [kunit] [58162.959841] kthread+0x10c/0x118 [58162.960093] retfrom_fork+0x10/0x20 [58162.960363] ---[ end trace 0000000000000000 ]---