函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\verifier.c Create Date:2022-07-27 14:09:58
Last Modify:2022-05-19 20:02:10 Copyright©Brick
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函数名称：__reg_bound_offset32

函数原型：static void __reg_bound_offset32(struct bpf_reg_state *reg)

返回类型：void

参数：

类型参数名称
struct bpf_reg_state *reg
1039  mask等于0xffffFFFF
1040  range等于A value that's unknown except that @min <= value <= @max
1042  lo32等于Return @a with all but the lowest @size bytes cleared
1043  hi32等于Shift a tnum left (by a fixed shift)
1045  For scalar types (SCALAR_VALUE), this represents our knowledge of * the actual value. * For pointer types, this represents the variable part of the offset * from the pointed-to object, and is shared with all bpf_reg_states * with the same id as us.等于Bitwise-OR, return @a | @b
调用者
名称描述
reg_set_min_maxAdjusts the register min/max values in the case that the dst_reg is the* variable register that we are working on, and src_reg is a constant or we're* simply doing a BPF_K check.* In JEQ/JNE cases we also adjust the var_off values.
reg_set_min_max_invSame as above, but for the case that dst_reg holds a constant and src_reg is* the variable reg.