Function report |
Source Code:kernel\bpf\verifier.c |
Create Date:2022-07-28 12:56:33 |
Last Modify:2022-05-19 20:02:10 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:Attempts to improve min/max values based on var_off information
Proto:static void __update_reg_bounds(struct bpf_reg_state *reg)
Type:void
Parameter:
Type | Parameter | Name |
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struct bpf_reg_state * | reg |
989 | minimum possible (u64)value = max - return maximum of two values of the same or compatible types*@x: first value*@y: second value( minimum possible (u64)value , value) |
990 | maximum possible (u64)value = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value( maximum possible (u64)value , value | mask) |
Name | Describe |
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adjust_ptr_min_max_vals | Handles arithmetic on a pointer and a scalar: computes new min/max and var_off.* Caller should also handle BPF_MOV case separately.* If we return -EACCES, caller may want to try again treating pointer as a* scalar |
adjust_scalar_min_max_vals | WARNING: This function does calculations on 64-bit values, but the actual* execution may occur on 32-bit values. Therefore, things like bitshifts* need extra checks in the 32-bit case. |
reg_set_min_max | Adjusts 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_inv | Same as above, but for the case that dst_reg holds a constant and src_reg is* the variable reg. |
__reg_combine_min_max | Regs are known to be equal, so intersect their min/max/var_off |
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