Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in kernel/auditfilter.c:179:23 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c audit_register_class+0x9d/0x137 audit_classes_init+0x4d/0xb8 do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK>
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| @@ -187,7 +187,7 @@ · 186 unmodified lines | ||
| 187 | 187 | #define AUDIT_MAX_KEY_LEN 256 |
| 188 | 188 | #define AUDIT_BITMASK_SIZE 64 |
| 189 | 189 | #define AUDIT_WORD(nr) ((__u32)((nr)/32)) |
| 190 | −#define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32)) | |
| 190 | +#define AUDIT_BIT(nr) (1U << ((nr) - AUDIT_WORD(nr)*32)) | |
| 191 | 191 | |
| 192 | 192 | #define AUDIT_SYSCALL_CLASSES 16 |
| 193 | 193 | #define AUDIT_CLASS_DIR_WRITE 0 |