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 14:11:39
Last Modify:2022-05-19 20:02:10 Copyright©Brick
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函数名称:__is_pointer_value

函数原型:static bool __is_pointer_value(bool allow_ptr_leaks, const struct bpf_reg_state *reg)

返回类型:bool

参数:

类型参数名称
boolallow_ptr_leaks
const struct bpf_reg_state *reg
2494  如果allow_ptr_leaks则返回:false
2497  返回: Ordering of fields matters. See states_equal() 不等于g doesn't contain a valid pointer
调用者
名称描述
is_pointer_value
is_branch_takenmpute branch direction of the expression "if (reg opcode val) goto target;"* and return:* 1 - branch will be taken and "goto target" will be executed* 0 - branch will not be taken and fall-through to next insn* -1 - unknown
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.