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runc.35537
0002-bsc1221050-seccomp-patchbpf-rename-nativeA...
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File 0002-bsc1221050-seccomp-patchbpf-rename-nativeArch-linuxA.patch of Package runc.35537
From 558c5ecf487a40001ba854cfcbd5c94223167501 Mon Sep 17 00:00:00 2001 From: Aleksa Sarai <cyphar@cyphar.com> Date: Wed, 13 Mar 2024 13:40:16 +1100 Subject: [PATCH 2/4] bsc1221050: seccomp: patchbpf: rename nativeArch -> linuxAuditArch (This is a backport of 6167f5ffc3e3fd53e6a41a2effa592a4873ad046.) Calling the Linux AUDIT_* architecture constants "native" leads to confusing code when we are getting the actual native architecture of the running system. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> --- libcontainer/seccomp/patchbpf/enosys_linux.go | 81 ++++++++++--------- .../seccomp/patchbpf/enosys_linux_test.go | 16 ++-- 2 files changed, 49 insertions(+), 48 deletions(-) diff --git a/libcontainer/seccomp/patchbpf/enosys_linux.go b/libcontainer/seccomp/patchbpf/enosys_linux.go index c9c1d4ccb685..1b67fda85c64 100644 --- a/libcontainer/seccomp/patchbpf/enosys_linux.go +++ b/libcontainer/seccomp/patchbpf/enosys_linux.go @@ -164,11 +164,11 @@ func disassembleFilter(filter *libseccomp.ScmpFilter) ([]bpf.Instruction, error) return program, nil } -type nativeArch uint32 +type linuxAuditArch uint32 -const invalidArch nativeArch = 0 +const invalidArch linuxAuditArch = 0 -func archToNative(arch libseccomp.ScmpArch) (nativeArch, error) { +func scmpArchToAuditArch(arch libseccomp.ScmpArch) (linuxAuditArch, error) { switch arch { case libseccomp.ArchNative: // Convert to actual native architecture. @@ -176,48 +176,48 @@ func archToNative(arch libseccomp.ScmpArch) (nativeArch, error) { if err != nil { return invalidArch, fmt.Errorf("unable to get native arch: %w", err) } - return archToNative(arch) + return scmpArchToAuditArch(arch) case libseccomp.ArchX86: - return nativeArch(C.C_AUDIT_ARCH_I386), nil + return linuxAuditArch(C.C_AUDIT_ARCH_I386), nil case libseccomp.ArchAMD64, libseccomp.ArchX32: // NOTE: x32 is treated like x86_64 except all x32 syscalls have the // 30th bit of the syscall number set to indicate that it's not a // normal x86_64 syscall. - return nativeArch(C.C_AUDIT_ARCH_X86_64), nil + return linuxAuditArch(C.C_AUDIT_ARCH_X86_64), nil case libseccomp.ArchARM: - return nativeArch(C.C_AUDIT_ARCH_ARM), nil + return linuxAuditArch(C.C_AUDIT_ARCH_ARM), nil case libseccomp.ArchARM64: - return nativeArch(C.C_AUDIT_ARCH_AARCH64), nil + return linuxAuditArch(C.C_AUDIT_ARCH_AARCH64), nil case libseccomp.ArchMIPS: - return nativeArch(C.C_AUDIT_ARCH_MIPS), nil + return linuxAuditArch(C.C_AUDIT_ARCH_MIPS), nil case libseccomp.ArchMIPS64: - return nativeArch(C.C_AUDIT_ARCH_MIPS64), nil + return linuxAuditArch(C.C_AUDIT_ARCH_MIPS64), nil case libseccomp.ArchMIPS64N32: - return nativeArch(C.C_AUDIT_ARCH_MIPS64N32), nil + return linuxAuditArch(C.C_AUDIT_ARCH_MIPS64N32), nil case libseccomp.ArchMIPSEL: - return nativeArch(C.C_AUDIT_ARCH_MIPSEL), nil + return linuxAuditArch(C.C_AUDIT_ARCH_MIPSEL), nil case libseccomp.ArchMIPSEL64: - return nativeArch(C.C_AUDIT_ARCH_MIPSEL64), nil + return linuxAuditArch(C.C_AUDIT_ARCH_MIPSEL64), nil case libseccomp.ArchMIPSEL64N32: - return nativeArch(C.C_AUDIT_ARCH_MIPSEL64N32), nil + return linuxAuditArch(C.C_AUDIT_ARCH_MIPSEL64N32), nil case libseccomp.ArchPPC: - return nativeArch(C.C_AUDIT_ARCH_PPC), nil + return linuxAuditArch(C.C_AUDIT_ARCH_PPC), nil case libseccomp.ArchPPC64: - return nativeArch(C.C_AUDIT_ARCH_PPC64), nil + return linuxAuditArch(C.C_AUDIT_ARCH_PPC64), nil case libseccomp.ArchPPC64LE: - return nativeArch(C.C_AUDIT_ARCH_PPC64LE), nil + return linuxAuditArch(C.C_AUDIT_ARCH_PPC64LE), nil case libseccomp.ArchS390: - return nativeArch(C.C_AUDIT_ARCH_S390), nil + return linuxAuditArch(C.C_AUDIT_ARCH_S390), nil case libseccomp.ArchS390X: - return nativeArch(C.C_AUDIT_ARCH_S390X), nil + return linuxAuditArch(C.C_AUDIT_ARCH_S390X), nil case libseccomp.ArchRISCV64: - return nativeArch(C.C_AUDIT_ARCH_RISCV64), nil + return linuxAuditArch(C.C_AUDIT_ARCH_RISCV64), nil default: return invalidArch, fmt.Errorf("unknown architecture: %v", arch) } } -type lastSyscallMap map[nativeArch]map[libseccomp.ScmpArch]libseccomp.ScmpSyscall +type lastSyscallMap map[linuxAuditArch]map[libseccomp.ScmpArch]libseccomp.ScmpSyscall // Figure out largest syscall number referenced in the filter for each // architecture. We will be generating code based on the native architecture @@ -234,17 +234,17 @@ func findLastSyscalls(config *configs.Seccomp) (lastSyscallMap, error) { } // Figure out native architecture representation of the architecture. - nativeArch, err := archToNative(arch) + auditArch, err := scmpArchToAuditArch(arch) if err != nil { return nil, fmt.Errorf("cannot map architecture %v to AUDIT_ARCH_ constant: %w", arch, err) } - if _, ok := lastSyscalls[nativeArch]; !ok { - lastSyscalls[nativeArch] = map[libseccomp.ScmpArch]libseccomp.ScmpSyscall{} + if _, ok := lastSyscalls[auditArch]; !ok { + lastSyscalls[auditArch] = map[libseccomp.ScmpArch]libseccomp.ScmpSyscall{} } - if _, ok := lastSyscalls[nativeArch][arch]; ok { + if _, ok := lastSyscalls[auditArch][arch]; ok { // Because of ArchNative we may hit the same entry multiple times. - // Just skip it if we've seen this (nativeArch, ScmpArch) + // Just skip it if we've seen this (linuxAuditArch, ScmpArch) // combination before. continue } @@ -262,10 +262,11 @@ func findLastSyscalls(config *configs.Seccomp) (lastSyscallMap, error) { } } if largestSyscall != 0 { - lastSyscalls[nativeArch][arch] = largestSyscall + logrus.Debugf("seccomp: largest syscall number for arch %v is %v", arch, largestSyscall) + lastSyscalls[auditArch][arch] = largestSyscall } else { - logrus.Warnf("could not find any syscalls for arch %s", ociArch) - delete(lastSyscalls[nativeArch], arch) + logrus.Warnf("could not find any syscalls for arch %v", arch) + delete(lastSyscalls[auditArch], arch) } } return lastSyscalls, nil @@ -283,10 +284,10 @@ func findLastSyscalls(config *configs.Seccomp) (lastSyscallMap, error) { // close_range(2) which were added out-of-order in the syscall table between // kernel releases. func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) { - // A jump-table for each nativeArch used to generate the initial + // A jump-table for each linuxAuditArch used to generate the initial // conditional jumps -- measured from the *END* of the program so they // remain valid after prepending to the tail. - archJumpTable := map[nativeArch]uint32{} + archJumpTable := map[linuxAuditArch]uint32{} // Generate our own -ENOSYS rules for each architecture. They have to be // generated in reverse (prepended to the tail of the program) because the @@ -299,7 +300,7 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) } // Generate the syscall -ENOSYS rules. - for nativeArch, maxSyscalls := range lastSyscalls { + for auditArch, maxSyscalls := range lastSyscalls { // The number of instructions from the tail of this section which need // to be jumped in order to reach the -ENOSYS return. If the section // does not jump, it will fall through to the actual filter. @@ -380,7 +381,7 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) // If we're on x86 we need to add a check for x32 and if we're in // the wrong mode we jump over the section. - if uint32(nativeArch) == uint32(C.C_AUDIT_ARCH_X86_64) { + if uint32(auditArch) == uint32(C.C_AUDIT_ARCH_X86_64) { // Generate a prefix to check the mode. switch scmpArch { case libseccomp.ArchAMD64: @@ -409,8 +410,8 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) section = append(section, sectionTail...) case 2: // x32 and x86_64 are a unique case, we can't handle any others. - if uint32(nativeArch) != uint32(C.C_AUDIT_ARCH_X86_64) { - return nil, fmt.Errorf("unknown architecture overlap on native arch %#x", nativeArch) + if uint32(auditArch) != uint32(C.C_AUDIT_ARCH_X86_64) { + return nil, fmt.Errorf("unknown architecture overlap on native arch %#x", auditArch) } x32sysno, ok := maxSyscalls[libseccomp.ArchX32] @@ -487,7 +488,7 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) programTail = append(section, programTail...) // Update jump table. - archJumpTable[nativeArch] = uint32(len(programTail)) + archJumpTable[auditArch] = uint32(len(programTail)) } // Add a dummy "jump to filter" for any architecture we might miss below. @@ -507,9 +508,9 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) // architectures based on how large the jumps are going to be, or // re-sort the candidate architectures each time to make sure that we // pick the largest jump which is going to be smaller than 255. - for nativeArch := range lastSyscalls { + for auditArch := range lastSyscalls { // We jump forwards but the jump table is calculated from the *END*. - jump := uint32(len(programTail)) - archJumpTable[nativeArch] + jump := uint32(len(programTail)) - archJumpTable[auditArch] // Same routine as above -- this is a basic jeq check, complicated // slightly if it turns out that we need to do a long jump. @@ -518,7 +519,7 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) // jeq [arch],[jump] bpf.JumpIf{ Cond: bpf.JumpEqual, - Val: uint32(nativeArch), + Val: uint32(auditArch), SkipTrue: uint8(jump), }, }, programTail...) @@ -527,7 +528,7 @@ func generateEnosysStub(lastSyscalls lastSyscallMap) ([]bpf.Instruction, error) // jne [arch],1 bpf.JumpIf{ Cond: bpf.JumpNotEqual, - Val: uint32(nativeArch), + Val: uint32(auditArch), SkipTrue: 1, }, // ja [jump] diff --git a/libcontainer/seccomp/patchbpf/enosys_linux_test.go b/libcontainer/seccomp/patchbpf/enosys_linux_test.go index e2d363a43bd3..bdfeff68adb3 100644 --- a/libcontainer/seccomp/patchbpf/enosys_linux_test.go +++ b/libcontainer/seccomp/patchbpf/enosys_linux_test.go @@ -23,7 +23,7 @@ type seccompData struct { } // mockSyscallPayload creates a fake seccomp_data struct with the given data. -func mockSyscallPayload(t *testing.T, sysno libseccomp.ScmpSyscall, arch nativeArch, args ...uint64) []byte { +func mockSyscallPayload(t *testing.T, sysno libseccomp.ScmpSyscall, arch linuxAuditArch, args ...uint64) []byte { var buf bytes.Buffer data := seccompData{ @@ -150,8 +150,8 @@ func testEnosysStub(t *testing.T, defaultAction configs.Action, arches []string) for _, arch := range testArches { type syscallTest struct { - syscall string sysno libseccomp.ScmpSyscall + syscall string expected uint32 } @@ -160,7 +160,7 @@ func testEnosysStub(t *testing.T, defaultAction configs.Action, arches []string) t.Fatalf("unknown libseccomp architecture %q: %v", arch, err) } - nativeArch, err := archToNative(scmpArch) + auditArch, err := scmpArchToAuditArch(scmpArch) if err != nil { t.Fatalf("unknown audit architecture %q: %v", arch, err) } @@ -179,9 +179,9 @@ func testEnosysStub(t *testing.T, defaultAction configs.Action, arches []string) t.Fatalf("unknown syscall %q on arch %q: %v", syscall, arch, err) } syscallTests = append(syscallTests, syscallTest{ - syscall, - sysno, - expected, + sysno: sysno, + syscall: syscall, + expected: expected, }) } @@ -233,7 +233,7 @@ func testEnosysStub(t *testing.T, defaultAction configs.Action, arches []string) test.expected = retFallthrough } - payload := mockSyscallPayload(t, test.sysno, nativeArch, 0x1337, 0xF00BA5) + payload := mockSyscallPayload(t, test.sysno, auditArch, 0x1337, 0xF00BA5) // NOTE: golang.org/x/net/bpf returns int here rather // than uint32. rawRet, err := filter.Run(payload) @@ -247,7 +247,7 @@ func testEnosysStub(t *testing.T, defaultAction configs.Action, arches []string) t.Logf(" [%4.1d] %s", idx, insn) } t.Logf("payload: %#v", payload) - t.Errorf("filter %s(%d) %q(%d): got %#x, want %#x", arch, nativeArch, test.syscall, test.sysno, ret, test.expected) + t.Errorf("filter %s(%d) %q(%d): got %#x, want %#x", arch, auditArch, test.syscall, test.sysno, ret, test.expected) } } } -- 2.46.0
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