In the Linux kernel, the following vulnerability has been resolved: ima: Avoid blocking in RCU read-side critical section A panic happens in imamatchpolicy: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 PGD 42f873067 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 5 PID: 1286325 Comm: kubeletmonit.sh Kdump: loaded Tainted: P Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 RIP: 0010:imamatchpolicy+0x84/0x450 Code: 49 89 fc 41 89 cf 31 ed 89 44 24 14 eb 1c 44 39 7b 18 74 26 41 83 ff 05 74 20 48 8b 1b 48 3b 1d f2 b9 f4 00 0f 84 9c 01 00 00 <44> 85 73 10 74 ea 44 8b 6b 14 41 f6 c5 01 75 d4 41 f6 c5 02 74 0f RSP: 0018:ff71570009e07a80 EFLAGS: 00010207 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000200 RDX: ffffffffad8dc7c0 RSI: 0000000024924925 RDI: ff3e27850dea2000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffabfce739 R10: ff3e27810cc42400 R11: 0000000000000000 R12: ff3e2781825ef970 R13: 00000000ff3e2785 R14: 000000000000000c R15: 0000000000000001 FS: 00007f5195b51740(0000) GS:ff3e278b12d40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 0000000626d24002 CR4: 0000000000361ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: imagetaction+0x22/0x30 processmeasurement+0xb0/0x830 ? pageaddfilermap+0x15/0x170 ? allocsetpte+0x269/0x4c0 ? prepnewpage+0x81/0x140 ? simplexattrget+0x75/0xa0 ? selinuxfileopen+0x9d/0xf0 imafilecheck+0x64/0x90 pathopenat+0x571/0x1720 dofilpopen+0x9b/0x110 ? pagecountertrycharge+0x57/0xc0 ? filescgroupallocfd+0x38/0x60 ? _allocfd+0xd4/0x250 ? dosysopen+0x1bd/0x250 dosysopen+0x1bd/0x250 dosyscall64+0x5d/0x1d0 entrySYSCALL64afterhwframe+0x65/0xca Commit c7423dbdbc9e ("ima: Handle -ESTALE returned by imafilterrulematch()") introduced call to imalsmcopyrule within a RCU read-side critical section which contains kmalloc with GFPKERNEL. This implies a possible sleep and violates limitations of RCU read-side critical sections on non-PREEMPT systems. Sleeping within RCU read-side critical section might cause synchronizercu() returning early and break RCU protection, allowing a UAF to happen. The root cause of this issue could be described as follows: | Thread A | Thread B | | |imamatchpolicy | | | rcureadlock | |imalsmupdaterule | | | synchronizercu | | | | kmalloc(GFPKERNEL)| | | sleep | ==> synchronizercu returns early | kfree(entry) | | | | entry = entry->next| ==> UAF happens and entry now becomes NULL (or could be anything). | | entry->action | ==> Accessing entry might cause panic. To fix this issue, we are converting all kmalloc that is called within RCU read-side critical section to use GFPATOMIC. [PM: fixed missing comment, long lines, !CONFIGIMALSM_RULES case]
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