diff options
Diffstat (limited to 'vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go')
| -rw-r--r-- | vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go | 176 |
1 files changed, 85 insertions, 91 deletions
diff --git a/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go b/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go index b0caac91b..dbac0cc30 100644 --- a/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go +++ b/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go @@ -20,43 +20,15 @@ import ( #include <seccomp.h> #if SCMP_VER_MAJOR < 2 -#error Minimum supported version of Libseccomp is v2.1.0 -#elif SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR < 1 -#error Minimum supported version of Libseccomp is v2.1.0 +#error Minimum supported version of Libseccomp is v2.2.0 +#elif SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR < 2 +#error Minimum supported version of Libseccomp is v2.2.0 #endif #define ARCH_BAD ~0 const uint32_t C_ARCH_BAD = ARCH_BAD; -#ifndef SCMP_ARCH_AARCH64 -#define SCMP_ARCH_AARCH64 ARCH_BAD -#endif - -#ifndef SCMP_ARCH_MIPS -#define SCMP_ARCH_MIPS ARCH_BAD -#endif - -#ifndef SCMP_ARCH_MIPS64 -#define SCMP_ARCH_MIPS64 ARCH_BAD -#endif - -#ifndef SCMP_ARCH_MIPS64N32 -#define SCMP_ARCH_MIPS64N32 ARCH_BAD -#endif - -#ifndef SCMP_ARCH_MIPSEL -#define SCMP_ARCH_MIPSEL ARCH_BAD -#endif - -#ifndef SCMP_ARCH_MIPSEL64 -#define SCMP_ARCH_MIPSEL64 ARCH_BAD -#endif - -#ifndef SCMP_ARCH_MIPSEL64N32 -#define SCMP_ARCH_MIPSEL64N32 ARCH_BAD -#endif - #ifndef SCMP_ARCH_PPC #define SCMP_ARCH_PPC ARCH_BAD #endif @@ -101,12 +73,6 @@ const uint32_t C_ACT_ERRNO = SCMP_ACT_ERRNO(0); const uint32_t C_ACT_TRACE = SCMP_ACT_TRACE(0); const uint32_t C_ACT_ALLOW = SCMP_ACT_ALLOW; -// If TSync is not supported, make sure it doesn't map to a supported filter attribute -// Don't worry about major version < 2, the minimum version checks should catch that case -#if SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR < 2 -#define SCMP_FLTATR_CTL_TSYNC _SCMP_CMP_MIN -#endif - const uint32_t C_ATTRIBUTE_DEFAULT = (uint32_t)SCMP_FLTATR_ACT_DEFAULT; const uint32_t C_ATTRIBUTE_BADARCH = (uint32_t)SCMP_FLTATR_ACT_BADARCH; const uint32_t C_ATTRIBUTE_NNP = (uint32_t)SCMP_FLTATR_CTL_NNP; @@ -124,25 +90,61 @@ const int C_VERSION_MAJOR = SCMP_VER_MAJOR; const int C_VERSION_MINOR = SCMP_VER_MINOR; const int C_VERSION_MICRO = SCMP_VER_MICRO; +#if SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR >= 3 +unsigned int get_major_version() +{ + return seccomp_version()->major; +} + +unsigned int get_minor_version() +{ + return seccomp_version()->minor; +} + +unsigned int get_micro_version() +{ + return seccomp_version()->micro; +} +#else +unsigned int get_major_version() +{ + return (unsigned int)C_VERSION_MAJOR; +} + +unsigned int get_minor_version() +{ + return (unsigned int)C_VERSION_MINOR; +} + +unsigned int get_micro_version() +{ + return (unsigned int)C_VERSION_MICRO; +} +#endif + typedef struct scmp_arg_cmp* scmp_cast_t; -// Wrapper to create an scmp_arg_cmp struct -void* -make_struct_arg_cmp( - unsigned int arg, - int compare, - uint64_t a, - uint64_t b - ) +void* make_arg_cmp_array(unsigned int length) { - struct scmp_arg_cmp *s = malloc(sizeof(struct scmp_arg_cmp)); + return calloc(length, sizeof(struct scmp_arg_cmp)); +} - s->arg = arg; - s->op = compare; - s->datum_a = a; - s->datum_b = b; +// Wrapper to add an scmp_arg_cmp struct to an existing arg_cmp array +void add_struct_arg_cmp( + struct scmp_arg_cmp* arr, + unsigned int pos, + unsigned int arg, + int compare, + uint64_t a, + uint64_t b + ) +{ + arr[pos].arg = arg; + arr[pos].op = compare; + arr[pos].datum_a = a; + arr[pos].datum_b = b; - return s; + return; } */ import "C" @@ -177,23 +179,23 @@ var ( // Error thrown on bad filter context errBadFilter = fmt.Errorf("filter is invalid or uninitialized") // Constants representing library major, minor, and micro versions - verMajor = int(C.C_VERSION_MAJOR) - verMinor = int(C.C_VERSION_MINOR) - verMicro = int(C.C_VERSION_MICRO) + verMajor = uint(C.get_major_version()) + verMinor = uint(C.get_minor_version()) + verMicro = uint(C.get_micro_version()) ) // Nonexported functions // Check if library version is greater than or equal to the given one -func checkVersionAbove(major, minor, micro int) bool { +func checkVersionAbove(major, minor, micro uint) bool { return (verMajor > major) || (verMajor == major && verMinor > minor) || (verMajor == major && verMinor == minor && verMicro >= micro) } -// Ensure that the library is supported, i.e. >= 2.1.0. +// Ensure that the library is supported, i.e. >= 2.2.0. func ensureSupportedVersion() error { - if !checkVersionAbove(2, 1, 0) { + if !checkVersionAbove(2, 2, 0) { return VersionError{} } return nil @@ -215,13 +217,6 @@ func (f *ScmpFilter) getFilterAttr(attr scmpFilterAttr) (C.uint32_t, error) { return 0x0, errBadFilter } - if !checkVersionAbove(2, 2, 0) && attr == filterAttrTsync { - return 0x0, VersionError{ - message: "thread synchronization attribute is not supported", - minimum: "2.2.0", - } - } - var attribute C.uint32_t retCode := C.seccomp_attr_get(f.filterCtx, attr.toNative(), &attribute) @@ -241,13 +236,6 @@ func (f *ScmpFilter) setFilterAttr(attr scmpFilterAttr, value C.uint32_t) error return errBadFilter } - if !checkVersionAbove(2, 2, 0) && attr == filterAttrTsync { - return VersionError{ - message: "thread synchronization attribute is not supported", - minimum: "2.2.0", - } - } - retCode := C.seccomp_attr_set(f.filterCtx, attr.toNative(), value) if retCode != 0 { return syscall.Errno(-1 * retCode) @@ -259,12 +247,9 @@ func (f *ScmpFilter) setFilterAttr(attr scmpFilterAttr, value C.uint32_t) error // DOES NOT LOCK OR CHECK VALIDITY // Assumes caller has already done this // Wrapper for seccomp_rule_add_... functions -func (f *ScmpFilter) addRuleWrapper(call ScmpSyscall, action ScmpAction, exact bool, cond C.scmp_cast_t) error { - var length C.uint - if cond != nil { - length = 1 - } else { - length = 0 +func (f *ScmpFilter) addRuleWrapper(call ScmpSyscall, action ScmpAction, exact bool, length C.uint, cond C.scmp_cast_t) error { + if length != 0 && cond == nil { + return fmt.Errorf("null conditions list, but length is nonzero") } var retCode C.int @@ -275,9 +260,11 @@ func (f *ScmpFilter) addRuleWrapper(call ScmpSyscall, action ScmpAction, exact b } if syscall.Errno(-1*retCode) == syscall.EFAULT { - return fmt.Errorf("unrecognized syscall") + return fmt.Errorf("unrecognized syscall %#x", int32(call)) } else if syscall.Errno(-1*retCode) == syscall.EPERM { return fmt.Errorf("requested action matches default action of filter") + } else if syscall.Errno(-1*retCode) == syscall.EINVAL { + return fmt.Errorf("two checks on same syscall argument") } else if retCode != 0 { return syscall.Errno(-1 * retCode) } @@ -295,7 +282,7 @@ func (f *ScmpFilter) addRuleGeneric(call ScmpSyscall, action ScmpAction, exact b } if len(conds) == 0 { - if err := f.addRuleWrapper(call, action, exact, nil); err != nil { + if err := f.addRuleWrapper(call, action, exact, 0, nil); err != nil { return err } } else { @@ -307,13 +294,20 @@ func (f *ScmpFilter) addRuleGeneric(call ScmpSyscall, action ScmpAction, exact b } } - for _, cond := range conds { - cmpStruct := C.make_struct_arg_cmp(C.uint(cond.Argument), cond.Op.toNative(), C.uint64_t(cond.Operand1), C.uint64_t(cond.Operand2)) - defer C.free(cmpStruct) + argsArr := C.make_arg_cmp_array(C.uint(len(conds))) + if argsArr == nil { + return fmt.Errorf("error allocating memory for conditions") + } + defer C.free(argsArr) - if err := f.addRuleWrapper(call, action, exact, C.scmp_cast_t(cmpStruct)); err != nil { - return err - } + for i, cond := range conds { + C.add_struct_arg_cmp(C.scmp_cast_t(argsArr), C.uint(i), + C.uint(cond.Argument), cond.Op.toNative(), + C.uint64_t(cond.Operand1), C.uint64_t(cond.Operand2)) + } + + if err := f.addRuleWrapper(call, action, exact, C.uint(len(conds)), C.scmp_cast_t(argsArr)); err != nil { + return err } } @@ -325,11 +319,11 @@ func (f *ScmpFilter) addRuleGeneric(call ScmpSyscall, action ScmpAction, exact b // Helper - Sanitize Arch token input func sanitizeArch(in ScmpArch) error { if in < archStart || in > archEnd { - return fmt.Errorf("unrecognized architecture") + return fmt.Errorf("unrecognized architecture %#x", uint(in)) } if in.toNative() == C.C_ARCH_BAD { - return fmt.Errorf("architecture is not supported on this version of the library") + return fmt.Errorf("architecture %v is not supported on this version of the library", in) } return nil @@ -338,7 +332,7 @@ func sanitizeArch(in ScmpArch) error { func sanitizeAction(in ScmpAction) error { inTmp := in & 0x0000FFFF if inTmp < actionStart || inTmp > actionEnd { - return fmt.Errorf("unrecognized action") + return fmt.Errorf("unrecognized action %#x", uint(inTmp)) } if inTmp != ActTrace && inTmp != ActErrno && (in&0xFFFF0000) != 0 { @@ -350,7 +344,7 @@ func sanitizeAction(in ScmpAction) error { func sanitizeCompareOp(in ScmpCompareOp) error { if in < compareOpStart || in > compareOpEnd { - return fmt.Errorf("unrecognized comparison operator") + return fmt.Errorf("unrecognized comparison operator %#x", uint(in)) } return nil @@ -393,7 +387,7 @@ func archFromNative(a C.uint32_t) (ScmpArch, error) { case C.C_ARCH_S390X: return ArchS390X, nil default: - return 0x0, fmt.Errorf("unrecognized architecture") + return 0x0, fmt.Errorf("unrecognized architecture %#x", uint32(a)) } } @@ -475,7 +469,7 @@ func actionFromNative(a C.uint32_t) (ScmpAction, error) { case C.C_ACT_ALLOW: return ActAllow, nil default: - return 0x0, fmt.Errorf("unrecognized action") + return 0x0, fmt.Errorf("unrecognized action %#x", uint32(a)) } } |