In the Linux kernel, the following vulnerability has been resolved: ftrace: Clean up hash directfunctions on register failures We see the following GPF when registerftracedirect fails: [ ] general protection fault, probably for non-canonical address \ 0x200000000000010: 0000 [#1] PREEMPT SMP DEBUGPAGEALLOC PTI [...] [ ] RIP: 0010:ftracefindrecdirect+0x53/0x70 [ ] Code: 48 c1 e0 03 48 03 42 08 48 8b 10 31 c0 48 85 d2 74 [...] [ ] RSP: 0018:ffffc9000138bc10 EFLAGS: 00010206 [ ] RAX: 0000000000000000 RBX: ffffffff813e0df0 RCX: 000000000000003b [ ] RDX: 0200000000000000 RSI: 000000000000000c RDI: ffffffff813e0df0 [ ] RBP: ffffffffa00a3000 R08: ffffffff81180ce0 R09: 0000000000000001 [ ] R10: ffffc9000138bc18 R11: 0000000000000001 R12: ffffffff813e0df0 [ ] R13: ffffffff813e0df0 R14: ffff888171b56400 R15: 0000000000000000 [ ] FS: 00007fa9420c7780(0000) GS:ffff888ff6a00000(0000) knlGS:000000000 [ ] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ ] CR2: 000000000770d000 CR3: 0000000107d50003 CR4: 0000000000370ee0 [ ] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ ] Call Trace: [ ] <TASK> [ ] registerftracedirect+0x54/0x290 [ ] ? rendersigsett+0xa0/0xa0 [ ] bpftrampolineupdate+0x3f5/0x4a0 [ ] ? 0xffffffffa00a3000 [ ] bpftrampolinelinkprog+0xa9/0x140 [ ] bpftracingprogattach+0x1dc/0x450 [ ] bpfrawtracepointopen+0x9a/0x1e0 [ ] ? findheldlock+0x2d/0x90 [ ] ? lockrelease+0x150/0x430 [ ] _sysbpf+0xbd6/0x2700 [ ] ? lockisheldtype+0xd8/0x130 [ ] _x64sysbpf+0x1c/0x20 [ ] dosyscall64+0x3a/0x80 [ ] entrySYSCALL64afterhwframe+0x44/0xae [ ] RIP: 0033:0x7fa9421defa9 [ ] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 9 f8 [...] [ ] RSP: 002b:00007ffed743bd78 EFLAGS: 00000246 ORIGRAX: 0000000000000141 [ ] RAX: ffffffffffffffda RBX: 00000000069d2480 RCX: 00007fa9421defa9 [ ] RDX: 0000000000000078 RSI: 00007ffed743bd80 RDI: 0000000000000011 [ ] RBP: 00007ffed743be00 R08: 0000000000bb7270 R09: 0000000000000000 [ ] R10: 00000000069da210 R11: 0000000000000246 R12: 0000000000000001 [ ] R13: 00007ffed743c4b0 R14: 00000000069d2480 R15: 0000000000000001 [ ] </TASK> [ ] Modules linked in: klpvm(OK) [ ] ---[ end trace 0000000000000000 ]--- One way to trigger this is: 1. load a livepatch that patches kernel function xxx; 2. run bpftrace -e 'kfunc:xxx {}', this will fail (expected for now); 3. repeat #2 => gpf. This is because the entry is added to directfunctions, but not removed. Fix this by remove the entry from directfunctions when registerftrace_direct fails. Also remove the last trailing space from ftrace.c, so we don't have to worry about it anymore.
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