Refactor - Assign SBPF versions to SIMDs #602
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LucasSte
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Nov 22, 2024
src/verifier.rs
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| @@ -402,7 +402,7 @@ impl Verifier for RequisiteVerifier { | |||
| ebpf::CALL_REG => { check_callx_register(&insn, insn_ptr, sbpf_version)?; }, | |||
| ebpf::EXIT if !sbpf_version.static_syscalls() => {}, | |||
| ebpf::RETURN if sbpf_version.static_syscalls() => {}, | |||
| ebpf::SYSCALL if sbpf_version.static_syscalls() => { | |||
| ebpf::SYSCALL if sbpf_version.stricter_controlflow() => { | |||
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This one is still static syscall isn't it?
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I believe that check here should still be sbpf_version.static_syscalls(), as this path will be available with static syscalls.
| @@ -2068,7 +2070,7 @@ mod test { | |||
| assert!(matches!( | |||
| ElfExecutable::parse_ro_sections( | |||
| &config, | |||
| &SBPFVersion::V1, // v2 requires optimize_rodata=true | |||
| &SBPFVersion::V0, // v2 requires optimize_rodata=true | |||
doc/bytecode.md
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| - `add64 reg, imm` can use `r11` as destination register | ||
|
|
||
| ### until v3 | ||
| - The targets of `call` instructions (which includes `syscall` instructions) is checked at runtime not verification time |
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Suggested change
| - The targets of `call` instructions (which includes `syscall` instructions) is checked at runtime not verification time | |
| - The targets of `call` instructions (which includes `syscall` instructions) are checked at runtime not verification time |
LucasSte
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Nov 25, 2024
| } else { | ||
| SBPFVersion::V1 | ||
| SBPFVersion::V0 |
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If we get a 3 in the e_flags, the version will be V0 here.
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Yep exactly, that is the bug we are feature gating out here.
src/verifier.rs
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| @@ -402,7 +402,7 @@ impl Verifier for RequisiteVerifier { | |||
| ebpf::CALL_REG => { check_callx_register(&insn, insn_ptr, sbpf_version)?; }, | |||
| ebpf::EXIT if !sbpf_version.static_syscalls() => {}, | |||
| ebpf::RETURN if sbpf_version.static_syscalls() => {}, | |||
| ebpf::SYSCALL if sbpf_version.static_syscalls() => { | |||
| ebpf::SYSCALL if sbpf_version.stricter_controlflow() => { | |||
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I believe that check here should still be sbpf_version.static_syscalls(), as this path will be available with static syscalls.
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LucasSte
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src/verifier.rs
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| @@ -391,22 +391,27 @@ impl Verifier for RequisiteVerifier { | |||
| ebpf::JSLE_IMM => { check_jmp_offset(prog, insn_ptr, &function_range)?; }, | |||
| ebpf::JSLE_REG => { check_jmp_offset(prog, insn_ptr, &function_range)?; }, | |||
| ebpf::CALL_IMM if sbpf_version.static_syscalls() => { | |||
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This one doesn't need to be gated behind static_syscalls does it?
src/verifier.rs
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| ebpf::SYSCALL if sbpf_version.static_syscalls() => { | ||
| check_call_target( | ||
| insn.imm as u32, | ||
| syscall_registry, | ||
| VerifierError::InvalidSyscall(insn.imm as u32))?; | ||
| if sbpf_version.stricter_controlflow() { |
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One to make it a valid opcode and one for the verification rule. These are two different SIMDs but same SBPF version.
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The verification rule for static syscalls is in the static syscalls SIMD.
doc/bytecode.md
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| - `le` is allowed | ||
| - `lddw` (opcodes `0x18` and `0x00`) are allowed |
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| - `lddw` (opcodes `0x18` and `0x00`) are allowed | |
| - `lddw` (opcodes `0x18` and `0x00`) is allowed |
doc/bytecode.md
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| - `le` is forbidden | ||
| - `lddw` (opcodes `0x18` and `0x00`) are forbidden |
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Suggested change
| - `lddw` (opcodes `0x18` and `0x00`) are forbidden | |
| - `lddw` (opcodes `0x18` and `0x00`) is forbidden |
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LucasSte
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Nov 26, 2024
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