Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\verifier.c Create Date:2022-07-28 12:56:31
Last Modify:2022-05-19 20:02:10 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:mark_reg_known_zero

Proto:static void mark_reg_known_zero(struct bpf_verifier_env *env, struct bpf_reg_state *regs, u32 regno)

Type:void

Parameter:

TypeParameterName
struct bpf_verifier_env *env
struct bpf_reg_state *regs
u32regno
945  If WARN_ON(regno >= BPF has 10 general purpose 64-bit registers and stack frame. ) Then
946  verbose(env, "mark_reg_known_zero(regs, %u)\n", regno)
948  When regno < BPF has 10 general purpose 64-bit registers and stack frame. cycle __mark_reg_not_init(env, regs + regno)
950  Return
952  Mark the 'variable offset' part of a register as zero. This should be* used only on registers holding a pointer type.
Caller
NameDescribe
init_reg_state
check_ptr_to_btf_access
check_mem_accessheck whether memory at (regno + off) is accessible for t = (read | write)* if t==write, value_regno is a register which value is stored into memory* if t==read, value_regno is a register which will receive the value from memory* if t==write &&
check_helper_call
check_ld_immverify BPF_LD_IMM64 instruction