In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid zeroing outside-object freepointer for single free Commit 284f17ac13fe ("mm/slub: handle bulk and single object freeing separately") splits single and bulk object freeing in two functions slabfree() and slabfreebulk() which leads slabfree() to call slabfreehook() directly instead of slabfreefreelisthook(). If init_on_free
is set, slabfreehook() zeroes the object. Afterward, if slub_debug=F
and CONFIG_SLAB_FREELIST_HARDENED
are set, the doslabfree() slowpath executes freelist consistency checks and try to decode a zeroed freepointer which leads to a "Freepointer corrupt" detection in checkobject(). During bulk free, slabfreefreelisthook() isn't affected as it always sets it objects freepointer using setfreepointer() to maintain its reconstructed freelist after init_on_free
. For single free, object's freepointer thus needs to be avoided when stored outside the object if init_on_free
is set. The freepointer left as is, check_object() may later detect an invalid pointer value due to objects overflow. To reproduce, set slub_debug=FU init_on_free=1 log_level=7
on the command line of a kernel build with CONFIG_SLAB_FREELIST_HARDENED=y
. dmesg sample log: [ 10.708715] ============================================================================= [ 10.710323] BUG kmalloc-rnd-05-32 (Tainted: G B T ): Freepointer corrupt [ 10.712695] ----------------------------------------------------------------------------- [ 10.712695] [ 10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [ 10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [ 10.716698] [ 10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Object ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Object ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Padding ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Padding ffff9d9a8035667c: 00 00 00 00 .... [ 10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed
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