CVE-2022-49870

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> capabilities: fix undefined behavior in bit shift for CAP_TO_MASK<br /> <br /> Shifting signed 32-bit value by 31 bits is undefined, so changing<br /> significant bit to unsigned. The UBSAN warning calltrace like below:<br /> <br /> UBSAN: shift-out-of-bounds in security/commoncap.c:1252:2<br /> left shift of 1 by 31 places cannot be represented in type &amp;#39;int&amp;#39;<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x7d/0xa5<br /> dump_stack+0x15/0x1b<br /> ubsan_epilogue+0xe/0x4e<br /> __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c<br /> cap_task_prctl+0x561/0x6f0<br /> security_task_prctl+0x5a/0xb0<br /> __x64_sys_prctl+0x61/0x8f0<br /> do_syscall_64+0x58/0x80<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br />