diff options
Diffstat (limited to 'vendor/github.com/seccomp')
5 files changed, 492 insertions, 31 deletions
diff --git a/vendor/github.com/seccomp/libseccomp-golang/.travis.yml b/vendor/github.com/seccomp/libseccomp-golang/.travis.yml index feef144d1..5240d4622 100644 --- a/vendor/github.com/seccomp/libseccomp-golang/.travis.yml +++ b/vendor/github.com/seccomp/libseccomp-golang/.travis.yml @@ -19,19 +19,39 @@ os: language: go +jobs: + include: + - name: "last libseccomp 2.5.0" + env: + - SECCOMP_VER=2.5.0 + - SECCOMP_SHA256SUM=1ffa7038d2720ad191919816db3479295a4bcca1ec14e02f672539f4983014f3 + - name: "compat libseccomp 2.4.4" + env: + - SECCOMP_VER=2.4.4 + - SECCOMP_SHA256SUM=4e79738d1ef3c9b7ca9769f1f8b8d84fc17143c2c1c432e53b9c64787e0ff3eb + - name: "compat libseccomp 2.2.1" + env: + - SECCOMP_VER=2.2.1 + - SECCOMP_SHA256SUM=0ba1789f54786c644af54cdffc9fd0dd0a8bb2b2ee153933f658855d2851a740 + addons: apt: packages: - build-essential - # TODO: use the main libseccomp git repo instead of a distro package - - libseccomp2 - - libseccomp-dev + - astyle + - golint + - gperf install: - go get -u golang.org/x/lint/golint # run all of the tests independently, fail if any of the tests error script: + - wget https://github.com/seccomp/libseccomp/releases/download/v$SECCOMP_VER/libseccomp-$SECCOMP_VER.tar.gz + - echo $SECCOMP_SHA256SUM libseccomp-$SECCOMP_VER.tar.gz | sha256sum -c + - tar xf libseccomp-$SECCOMP_VER.tar.gz + - pushd libseccomp-$SECCOMP_VER && ./configure --prefix=/opt/libseccomp-$SECCOMP_VER && make && sudo make install && popd - make check-syntax - make lint - - make check + - PKG_CONFIG_PATH=/opt/libseccomp-$SECCOMP_VER/lib/pkgconfig LD_LIBRARY_PATH=/opt/libseccomp-$SECCOMP_VER/lib make vet + - PKG_CONFIG_PATH=/opt/libseccomp-$SECCOMP_VER/lib/pkgconfig LD_LIBRARY_PATH=/opt/libseccomp-$SECCOMP_VER/lib make test diff --git a/vendor/github.com/seccomp/libseccomp-golang/Makefile b/vendor/github.com/seccomp/libseccomp-golang/Makefile index 1ff4cc898..38cfa852c 100644 --- a/vendor/github.com/seccomp/libseccomp-golang/Makefile +++ b/vendor/github.com/seccomp/libseccomp-golang/Makefile @@ -18,8 +18,14 @@ fix-syntax: vet: go vet -v +# Previous bugs have made the tests freeze until the timeout. Golang default +# timeout for tests is 10 minutes, which is too long, considering current tests +# can be executed in less than 1 second. Reduce the timeout, so problems can +# be noticed earlier in the CI. +TEST_TIMEOUT=10s + test: - go test -v + go test -v -timeout $(TEST_TIMEOUT) lint: @$(if $(shell which golint),true,$(error "install golint and include it in your PATH")) diff --git a/vendor/github.com/seccomp/libseccomp-golang/README.md b/vendor/github.com/seccomp/libseccomp-golang/README.md index 27423f2d9..806a5ddf2 100644 --- a/vendor/github.com/seccomp/libseccomp-golang/README.md +++ b/vendor/github.com/seccomp/libseccomp-golang/README.md @@ -2,7 +2,7 @@ =============================================================================== https://github.com/seccomp/libseccomp-golang -[](https://travis-ci.org/seccomp/libseccomp-golang) +[](https://travis-ci.org/seccomp/libseccomp-golang) The libseccomp library provides an easy to use, platform independent, interface to the Linux Kernel's syscall filtering mechanism. The libseccomp API is diff --git a/vendor/github.com/seccomp/libseccomp-golang/seccomp.go b/vendor/github.com/seccomp/libseccomp-golang/seccomp.go index e489b9ebd..e9b92e221 100644 --- a/vendor/github.com/seccomp/libseccomp-golang/seccomp.go +++ b/vendor/github.com/seccomp/libseccomp-golang/seccomp.go @@ -20,6 +20,13 @@ import ( // C wrapping code +// To compile libseccomp-golang against a specific version of libseccomp: +// cd ../libseccomp && mkdir -p prefix +// ./configure --prefix=$PWD/prefix && make && make install +// cd ../libseccomp-golang +// PKG_CONFIG_PATH=$PWD/../libseccomp/prefix/lib/pkgconfig/ make +// LD_PRELOAD=$PWD/../libseccomp/prefix/lib/libseccomp.so.2.5.0 PKG_CONFIG_PATH=$PWD/../libseccomp/prefix/lib/pkgconfig/ make test + // #cgo pkg-config: libseccomp // #include <stdlib.h> // #include <seccomp.h> @@ -34,19 +41,25 @@ type VersionError struct { minimum string } +func init() { + // This forces the cgo libseccomp to initialize its internal API support state, + // which is necessary on older versions of libseccomp in order to work + // correctly. + GetAPI() +} + func (e VersionError) Error() string { - format := "Libseccomp version too low: " + messageStr := "" if e.message != "" { - format += e.message + ": " + messageStr = e.message + ": " } - format += "minimum supported is " + minimumStr := "" if e.minimum != "" { - format += e.minimum + ": " + minimumStr = e.minimum } else { - format += "2.2.0: " + minimumStr = "2.2.0" } - format += "detected %d.%d.%d" - return fmt.Sprintf(format, verMajor, verMinor, verMicro) + return fmt.Sprintf("Libseccomp version too low: %sminimum supported is %s: detected %d.%d.%d", messageStr, minimumStr, verMajor, verMinor, verMicro) } // ScmpArch represents a CPU architecture. Seccomp can restrict syscalls on a @@ -69,9 +82,61 @@ type ScmpCondition struct { Operand2 uint64 `json:"operand_two,omitempty"` } -// ScmpSyscall represents a Linux System Call +// Seccomp userspace notification structures associated with filters that use the ActNotify action. + +// ScmpSyscall identifies a Linux System Call by its number. type ScmpSyscall int32 +// ScmpFd represents a file-descriptor used for seccomp userspace notifications. +type ScmpFd int32 + +// ScmpNotifData describes the system call context that triggered a notification. +// +// Syscall: the syscall number +// Arch: the filter architecture +// InstrPointer: address of the instruction that triggered a notification +// Args: arguments (up to 6) for the syscall +// +type ScmpNotifData struct { + Syscall ScmpSyscall `json:"syscall,omitempty"` + Arch ScmpArch `json:"arch,omitempty"` + InstrPointer uint64 `json:"instr_pointer,omitempty"` + Args []uint64 `json:"args,omitempty"` +} + +// ScmpNotifReq represents a seccomp userspace notification. See NotifReceive() for +// info on how to pull such a notification. +// +// ID: notification ID +// Pid: process that triggered the notification event +// Flags: filter flags (see seccomp(2)) +// Data: system call context that triggered the notification +// +type ScmpNotifReq struct { + ID uint64 `json:"id,omitempty"` + Pid uint32 `json:"pid,omitempty"` + Flags uint32 `json:"flags,omitempty"` + Data ScmpNotifData `json:"data,omitempty"` +} + +// ScmpNotifResp represents a seccomp userspace notification response. See NotifRespond() +// for info on how to push such a response. +// +// ID: notification ID (must match the corresponding ScmpNotifReq ID) +// Error: must be 0 if no error occurred, or an error constant from package +// syscall (e.g., syscall.EPERM, etc). In the latter case, it's used +// as an error return from the syscall that created the notification. +// Val: return value for the syscall that created the notification. Only +// relevant if Error is 0. +// Flags: userspace notification response flag (e.g., NotifRespFlagContinue) +// +type ScmpNotifResp struct { + ID uint64 `json:"id,omitempty"` + Error int32 `json:"error,omitempty"` + Val uint64 `json:"val,omitempty"` + Flags uint32 `json:"flags,omitempty"` +} + // Exported Constants const ( @@ -117,6 +182,10 @@ const ( ArchS390 ScmpArch = iota // ArchS390X represents 64-bit System z/390 syscalls ArchS390X ScmpArch = iota + // ArchPARISC represents 32-bit PA-RISC + ArchPARISC ScmpArch = iota + // ArchPARISC64 represents 64-bit PA-RISC + ArchPARISC64 ScmpArch = iota ) const ( @@ -130,6 +199,9 @@ const ( ActKill ScmpAction = iota // ActTrap throws SIGSYS ActTrap ScmpAction = iota + // ActNotify triggers a userspace notification. This action is only usable when + // libseccomp API level 6 or higher is supported. + ActNotify ScmpAction = iota // ActErrno causes the syscall to return a negative error code. This // code can be set with the SetReturnCode method ActErrno ScmpAction = iota @@ -181,6 +253,21 @@ const ( CompareMaskedEqual ScmpCompareOp = iota ) +var ( + // ErrSyscallDoesNotExist represents an error condition where + // libseccomp is unable to resolve the syscall + ErrSyscallDoesNotExist = fmt.Errorf("could not resolve syscall name") +) + +const ( + // Userspace notification response flags + + // NotifRespFlagContinue tells the kernel to continue executing the system + // call that triggered the notification. Must only be used when the notication + // response's error is 0. + NotifRespFlagContinue uint32 = 1 +) + // Helpers for types // GetArchFromString returns an ScmpArch constant from a string representing an @@ -223,6 +310,10 @@ func GetArchFromString(arch string) (ScmpArch, error) { return ArchS390, nil case "s390x": return ArchS390X, nil + case "parisc": + return ArchPARISC, nil + case "parisc64": + return ArchPARISC64, nil default: return ArchInvalid, fmt.Errorf("cannot convert unrecognized string %q", arch) } @@ -263,6 +354,10 @@ func (a ScmpArch) String() string { return "s390" case ArchS390X: return "s390x" + case ArchPARISC: + return "parisc" + case ArchPARISC64: + return "parisc64" case ArchNative: return "native" case ArchInvalid: @@ -310,6 +405,8 @@ func (a ScmpAction) String() string { case ActTrace: return fmt.Sprintf("Action: Notify tracing processes with code %d", (a >> 16)) + case ActNotify: + return "Action: Notify userspace" case ActLog: return "Action: Log system call" case ActAllow: @@ -349,7 +446,7 @@ func GetLibraryVersion() (major, minor, micro uint) { // Returns a positive int containing the API level, or 0 with an error if the // API level could not be detected due to the library being older than v2.4.0. // See the seccomp_api_get(3) man page for details on available API levels: -// https://github.com/seccomp/libseccomp/blob/master/doc/man/man3/seccomp_api_get.3 +// https://github.com/seccomp/libseccomp/blob/main/doc/man/man3/seccomp_api_get.3 func GetAPI() (uint, error) { return getAPI() } @@ -359,7 +456,7 @@ func GetAPI() (uint, error) { // Returns an error if the API level could not be set. An error is always // returned if the library is older than v2.4.0 // See the seccomp_api_get(3) man page for details on available API levels: -// https://github.com/seccomp/libseccomp/blob/master/doc/man/man3/seccomp_api_get.3 +// https://github.com/seccomp/libseccomp/blob/main/doc/man/man3/seccomp_api_get.3 func SetAPI(api uint) error { return setAPI(api) } @@ -386,7 +483,7 @@ func (s ScmpSyscall) GetNameByArch(arch ScmpArch) (string, error) { cString := C.seccomp_syscall_resolve_num_arch(arch.toNative(), C.int(s)) if cString == nil { - return "", fmt.Errorf("could not resolve syscall name for %#x", int32(s)) + return "", ErrSyscallDoesNotExist } defer C.free(unsafe.Pointer(cString)) @@ -409,7 +506,7 @@ func GetSyscallFromName(name string) (ScmpSyscall, error) { result := C.seccomp_syscall_resolve_name(cString) if result == scmpError { - return 0, fmt.Errorf("could not resolve name to syscall: %q", name) + return 0, ErrSyscallDoesNotExist } return ScmpSyscall(result), nil @@ -433,7 +530,7 @@ func GetSyscallFromNameByArch(name string, arch ScmpArch) (ScmpSyscall, error) { result := C.seccomp_syscall_resolve_name_arch(arch.toNative(), cString) if result == scmpError { - return 0, fmt.Errorf("could not resolve name to syscall: %q on %v", name, arch) + return 0, ErrSyscallDoesNotExist } return ScmpSyscall(result), nil @@ -506,11 +603,10 @@ type ScmpFilter struct { lock sync.Mutex } -// NewFilter creates and returns a new filter context. -// Accepts a default action to be taken for syscalls which match no rules in -// the filter. -// Returns a reference to a valid filter context, or nil and an error if the -// filter context could not be created or an invalid default action was given. +// NewFilter creates and returns a new filter context. Accepts a default action to be +// taken for syscalls which match no rules in the filter. +// Returns a reference to a valid filter context, or nil and an error +// if the filter context could not be created or an invalid default action was given. func NewFilter(defaultAction ScmpAction) (*ScmpFilter, error) { if err := ensureSupportedVersion(); err != nil { return nil, err @@ -530,8 +626,8 @@ func NewFilter(defaultAction ScmpAction) (*ScmpFilter, error) { filter.valid = true runtime.SetFinalizer(filter, filterFinalizer) - // Enable TSync so all goroutines will receive the same rules - // If the kernel does not support TSYNC, allow us to continue without error + // Enable TSync so all goroutines will receive the same rules. + // If the kernel does not support TSYNC, allow us to continue without error. if err := filter.setFilterAttr(filterAttrTsync, 0x1); err != nil && err != syscall.ENOTSUP { filter.Release() return nil, fmt.Errorf("could not create filter - error setting tsync bit: %v", err) @@ -778,8 +874,9 @@ func (f *ScmpFilter) GetNoNewPrivsBit() (bool, error) { func (f *ScmpFilter) GetLogBit() (bool, error) { log, err := f.getFilterAttr(filterAttrLog) if err != nil { - api, apiErr := getAPI() - if (apiErr != nil && api == 0) || (apiErr == nil && api < 3) { + // Ignore error, if not supported returns apiLevel == 0 + apiLevel, _ := GetAPI() + if apiLevel < 3 { return false, fmt.Errorf("getting the log bit is only supported in libseccomp 2.4.0 and newer with API level 3 or higher") } @@ -793,6 +890,30 @@ func (f *ScmpFilter) GetLogBit() (bool, error) { return true, nil } +// GetSSB returns the current state the SSB bit will be set to on the filter +// being loaded, or an error if an issue was encountered retrieving the value. +// The SSB bit tells the kernel that a seccomp user is not interested in enabling +// Speculative Store Bypass mitigation. +// The SSB bit is only usable when libseccomp API level 4 or higher is +// supported. +func (f *ScmpFilter) GetSSB() (bool, error) { + ssb, err := f.getFilterAttr(filterAttrSSB) + if err != nil { + api, apiErr := getAPI() + if (apiErr != nil && api == 0) || (apiErr == nil && api < 4) { + return false, fmt.Errorf("getting the SSB flag is only supported in libseccomp 2.5.0 and newer with API level 4 or higher") + } + + return false, err + } + + if ssb == 0 { + return false, nil + } + + return true, nil +} + // SetBadArchAction sets the default action taken on a syscall for an // architecture not in the filter, or an error if an issue was encountered // setting the value. @@ -832,8 +953,9 @@ func (f *ScmpFilter) SetLogBit(state bool) error { err := f.setFilterAttr(filterAttrLog, toSet) if err != nil { - api, apiErr := getAPI() - if (apiErr != nil && api == 0) || (apiErr == nil && api < 3) { + // Ignore error, if not supported returns apiLevel == 0 + apiLevel, _ := GetAPI() + if apiLevel < 3 { return fmt.Errorf("setting the log bit is only supported in libseccomp 2.4.0 and newer with API level 3 or higher") } } @@ -841,6 +963,28 @@ func (f *ScmpFilter) SetLogBit(state bool) error { return err } +// SetSSB sets the state of the SSB bit, which will be applied on filter +// load, or an error if an issue was encountered setting the value. +// The SSB bit is only usable when libseccomp API level 4 or higher is +// supported. +func (f *ScmpFilter) SetSSB(state bool) error { + var toSet C.uint32_t = 0x0 + + if state { + toSet = 0x1 + } + + err := f.setFilterAttr(filterAttrSSB, toSet) + if err != nil { + api, apiErr := getAPI() + if (apiErr != nil && api == 0) || (apiErr == nil && api < 4) { + return fmt.Errorf("setting the SSB flag is only supported in libseccomp 2.5.0 and newer with API level 4 or higher") + } + } + + return err +} + // SetSyscallPriority sets a syscall's priority. // This provides a hint to the filter generator in libseccomp about the // importance of this syscall. High-priority syscalls are placed @@ -947,3 +1091,36 @@ func (f *ScmpFilter) ExportBPF(file *os.File) error { return nil } + +// Userspace Notification API + +// GetNotifFd returns the userspace notification file descriptor associated with the given +// filter context. Such a file descriptor is only valid after the filter has been loaded +// and only when the filter uses the ActNotify action. The file descriptor can be used to +// retrieve and respond to notifications associated with the filter (see NotifReceive(), +// NotifRespond(), and NotifIDValid()). +func (f *ScmpFilter) GetNotifFd() (ScmpFd, error) { + return f.getNotifFd() +} + +// NotifReceive retrieves a seccomp userspace notification from a filter whose ActNotify +// action has triggered. The caller is expected to process the notification and return a +// response via NotifRespond(). Each invocation of this function returns one +// notification. As multiple notifications may be pending at any time, this function is +// normally called within a polling loop. +func NotifReceive(fd ScmpFd) (*ScmpNotifReq, error) { + return notifReceive(fd) +} + +// NotifRespond responds to a notification retrieved via NotifReceive(). The response Id +// must match that of the corresponding notification retrieved via NotifReceive(). +func NotifRespond(fd ScmpFd, scmpResp *ScmpNotifResp) error { + return notifRespond(fd, scmpResp) +} + +// NotifIDValid checks if a notification is still valid. An return value of nil means the +// notification is still valid. Otherwise the notification is not valid. This can be used +// to mitigate time-of-check-time-of-use (TOCTOU) attacks as described in seccomp_notify_id_valid(2). +func NotifIDValid(fd ScmpFd, id uint64) error { + return notifIDValid(fd, id) +} diff --git a/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go b/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go index 0982e930f..8dc7b296f 100644 --- a/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go +++ b/vendor/github.com/seccomp/libseccomp-golang/seccomp_internal.go @@ -14,6 +14,13 @@ import ( // Get the seccomp header in scope // Need stdlib.h for free() on cstrings +// To compile libseccomp-golang against a specific version of libseccomp: +// cd ../libseccomp && mkdir -p prefix +// ./configure --prefix=$PWD/prefix && make && make install +// cd ../libseccomp-golang +// PKG_CONFIG_PATH=$PWD/../libseccomp/prefix/lib/pkgconfig/ make +// LD_PRELOAD=$PWD/../libseccomp/prefix/lib/libseccomp.so.2.5.0 PKG_CONFIG_PATH=$PWD/../libseccomp/prefix/lib/pkgconfig/ make test + // #cgo pkg-config: libseccomp /* #include <errno.h> @@ -50,6 +57,14 @@ const uint32_t C_ARCH_BAD = ARCH_BAD; #define SCMP_ARCH_S390X ARCH_BAD #endif +#ifndef SCMP_ARCH_PARISC +#define SCMP_ARCH_PARISC ARCH_BAD +#endif + +#ifndef SCMP_ARCH_PARISC64 +#define SCMP_ARCH_PARISC64 ARCH_BAD +#endif + const uint32_t C_ARCH_NATIVE = SCMP_ARCH_NATIVE; const uint32_t C_ARCH_X86 = SCMP_ARCH_X86; const uint32_t C_ARCH_X86_64 = SCMP_ARCH_X86_64; @@ -67,6 +82,8 @@ const uint32_t C_ARCH_PPC64 = SCMP_ARCH_PPC64; const uint32_t C_ARCH_PPC64LE = SCMP_ARCH_PPC64LE; const uint32_t C_ARCH_S390 = SCMP_ARCH_S390; const uint32_t C_ARCH_S390X = SCMP_ARCH_S390X; +const uint32_t C_ARCH_PARISC = SCMP_ARCH_PARISC; +const uint32_t C_ARCH_PARISC64 = SCMP_ARCH_PARISC64; #ifndef SCMP_ACT_LOG #define SCMP_ACT_LOG 0x7ffc0000U @@ -80,6 +97,10 @@ const uint32_t C_ARCH_S390X = SCMP_ARCH_S390X; #define SCMP_ACT_KILL_THREAD 0x00000000U #endif +#ifndef SCMP_ACT_NOTIFY +#define SCMP_ACT_NOTIFY 0x7fc00000U +#endif + const uint32_t C_ACT_KILL = SCMP_ACT_KILL; const uint32_t C_ACT_KILL_PROCESS = SCMP_ACT_KILL_PROCESS; const uint32_t C_ACT_KILL_THREAD = SCMP_ACT_KILL_THREAD; @@ -88,6 +109,7 @@ 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_LOG = SCMP_ACT_LOG; const uint32_t C_ACT_ALLOW = SCMP_ACT_ALLOW; +const uint32_t C_ACT_NOTIFY = SCMP_ACT_NOTIFY; // The libseccomp SCMP_FLTATR_CTL_LOG member of the scmp_filter_attr enum was // added in v2.4.0 @@ -95,12 +117,16 @@ const uint32_t C_ACT_ALLOW = SCMP_ACT_ALLOW; (SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR < 4) #define SCMP_FLTATR_CTL_LOG _SCMP_FLTATR_MIN #endif +#if SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR < 5 +#define SCMP_FLTATR_CTL_SSB _SCMP_FLTATR_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; const uint32_t C_ATTRIBUTE_TSYNC = (uint32_t)SCMP_FLTATR_CTL_TSYNC; const uint32_t C_ATTRIBUTE_LOG = (uint32_t)SCMP_FLTATR_CTL_LOG; +const uint32_t C_ATTRIBUTE_SSB = (uint32_t)SCMP_FLTATR_CTL_SSB; const int C_CMP_NE = (int)SCMP_CMP_NE; const int C_CMP_LT = (int)SCMP_CMP_LT; @@ -189,6 +215,51 @@ void add_struct_arg_cmp( return; } + +// The seccomp notify API functions were added in v2.5.0 +#if (SCMP_VER_MAJOR < 2) || \ + (SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR < 5) + +struct seccomp_data { + int nr; + __u32 arch; + __u64 instruction_pointer; + __u64 args[6]; +}; + +struct seccomp_notif { + __u64 id; + __u32 pid; + __u32 flags; + struct seccomp_data data; +}; + +struct seccomp_notif_resp { + __u64 id; + __s64 val; + __s32 error; + __u32 flags; +}; + +int seccomp_notify_alloc(struct seccomp_notif **req, struct seccomp_notif_resp **resp) { + return -EOPNOTSUPP; +} +int seccomp_notify_fd(const scmp_filter_ctx ctx) { + return -EOPNOTSUPP; +} +void seccomp_notify_free(struct seccomp_notif *req, struct seccomp_notif_resp *resp) { +} +int seccomp_notify_id_valid(int fd, uint64_t id) { + return -EOPNOTSUPP; +} +int seccomp_notify_receive(int fd, struct seccomp_notif *req) { + return -EOPNOTSUPP; +} +int seccomp_notify_respond(int fd, struct seccomp_notif_resp *resp) { + return -EOPNOTSUPP; +} + +#endif */ import "C" @@ -203,6 +274,7 @@ const ( filterAttrNNP scmpFilterAttr = iota filterAttrTsync scmpFilterAttr = iota filterAttrLog scmpFilterAttr = iota + filterAttrSSB scmpFilterAttr = iota ) const ( @@ -210,7 +282,7 @@ const ( scmpError C.int = -1 // Comparison boundaries to check for architecture validity archStart ScmpArch = ArchNative - archEnd ScmpArch = ArchS390X + archEnd ScmpArch = ArchPARISC64 // Comparison boundaries to check for action validity actionStart ScmpAction = ActKill actionEnd ScmpAction = ActKillProcess @@ -460,6 +532,10 @@ func archFromNative(a C.uint32_t) (ScmpArch, error) { return ArchS390, nil case C.C_ARCH_S390X: return ArchS390X, nil + case C.C_ARCH_PARISC: + return ArchPARISC, nil + case C.C_ARCH_PARISC64: + return ArchPARISC64, nil default: return 0x0, fmt.Errorf("unrecognized architecture %#x", uint32(a)) } @@ -500,6 +576,10 @@ func (a ScmpArch) toNative() C.uint32_t { return C.C_ARCH_S390 case ArchS390X: return C.C_ARCH_S390X + case ArchPARISC: + return C.C_ARCH_PARISC + case ArchPARISC64: + return C.C_ARCH_PARISC64 case ArchNative: return C.C_ARCH_NATIVE default: @@ -548,6 +628,8 @@ func actionFromNative(a C.uint32_t) (ScmpAction, error) { return ActLog, nil case C.C_ACT_ALLOW: return ActAllow, nil + case C.C_ACT_NOTIFY: + return ActNotify, nil default: return 0x0, fmt.Errorf("unrecognized action %#x", uint32(a)) } @@ -572,6 +654,8 @@ func (a ScmpAction) toNative() C.uint32_t { return C.C_ACT_LOG case ActAllow: return C.C_ACT_ALLOW + case ActNotify: + return C.C_ACT_NOTIFY default: return 0x0 } @@ -590,7 +674,181 @@ func (a scmpFilterAttr) toNative() uint32 { return uint32(C.C_ATTRIBUTE_TSYNC) case filterAttrLog: return uint32(C.C_ATTRIBUTE_LOG) + case filterAttrSSB: + return uint32(C.C_ATTRIBUTE_SSB) default: return 0x0 } } + +func (a ScmpSyscall) toNative() C.uint32_t { + return C.uint32_t(a) +} + +func syscallFromNative(a C.int) ScmpSyscall { + return ScmpSyscall(a) +} + +func notifReqFromNative(req *C.struct_seccomp_notif) (*ScmpNotifReq, error) { + scmpArgs := make([]uint64, 6) + for i := 0; i < len(scmpArgs); i++ { + scmpArgs[i] = uint64(req.data.args[i]) + } + + arch, err := archFromNative(req.data.arch) + if err != nil { + return nil, err + } + + scmpData := ScmpNotifData{ + Syscall: syscallFromNative(req.data.nr), + Arch: arch, + InstrPointer: uint64(req.data.instruction_pointer), + Args: scmpArgs, + } + + scmpReq := &ScmpNotifReq{ + ID: uint64(req.id), + Pid: uint32(req.pid), + Flags: uint32(req.flags), + Data: scmpData, + } + + return scmpReq, nil +} + +func (scmpResp *ScmpNotifResp) toNative(resp *C.struct_seccomp_notif_resp) { + resp.id = C.__u64(scmpResp.ID) + resp.val = C.__s64(scmpResp.Val) + resp.error = (C.__s32(scmpResp.Error) * -1) // kernel requires a negated value + resp.flags = C.__u32(scmpResp.Flags) +} + +// Userspace Notification API +// Calls to C.seccomp_notify* hidden from seccomp.go + +func (f *ScmpFilter) getNotifFd() (ScmpFd, error) { + f.lock.Lock() + defer f.lock.Unlock() + + if !f.valid { + return -1, errBadFilter + } + + // Ignore error, if not supported returns apiLevel == 0 + apiLevel, _ := GetAPI() + if apiLevel < 6 { + return -1, fmt.Errorf("seccomp notification requires API level >= 6; current level = %d", apiLevel) + } + + fd := C.seccomp_notify_fd(f.filterCtx) + + return ScmpFd(fd), nil +} + +func notifReceive(fd ScmpFd) (*ScmpNotifReq, error) { + var req *C.struct_seccomp_notif + var resp *C.struct_seccomp_notif_resp + + // Ignore error, if not supported returns apiLevel == 0 + apiLevel, _ := GetAPI() + if apiLevel < 6 { + return nil, fmt.Errorf("seccomp notification requires API level >= 6; current level = %d", apiLevel) + } + + // we only use the request here; the response is unused + if retCode := C.seccomp_notify_alloc(&req, &resp); retCode != 0 { + return nil, errRc(retCode) + } + + defer func() { + C.seccomp_notify_free(req, resp) + }() + + for { + retCode, errno := C.seccomp_notify_receive(C.int(fd), req) + if retCode == 0 { + break + } + + if errno == syscall.EINTR { + continue + } + + if errno == syscall.ENOENT { + return nil, errno + } + + return nil, errRc(retCode) + } + + return notifReqFromNative(req) +} + +func notifRespond(fd ScmpFd, scmpResp *ScmpNotifResp) error { + var req *C.struct_seccomp_notif + var resp *C.struct_seccomp_notif_resp + + // Ignore error, if not supported returns apiLevel == 0 + apiLevel, _ := GetAPI() + if apiLevel < 6 { + return fmt.Errorf("seccomp notification requires API level >= 6; current level = %d", apiLevel) + } + + // we only use the reponse here; the request is discarded + if retCode := C.seccomp_notify_alloc(&req, &resp); retCode != 0 { + return errRc(retCode) + } + + defer func() { + C.seccomp_notify_free(req, resp) + }() + + scmpResp.toNative(resp) + + for { + retCode, errno := C.seccomp_notify_respond(C.int(fd), resp) + if retCode == 0 { + break + } + + if errno == syscall.EINTR { + continue + } + + if errno == syscall.ENOENT { + return errno + } + + return errRc(retCode) + } + + return nil +} + +func notifIDValid(fd ScmpFd, id uint64) error { + // Ignore error, if not supported returns apiLevel == 0 + apiLevel, _ := GetAPI() + if apiLevel < 6 { + return fmt.Errorf("seccomp notification requires API level >= 6; current level = %d", apiLevel) + } + + for { + retCode, errno := C.seccomp_notify_id_valid(C.int(fd), C.uint64_t(id)) + if retCode == 0 { + break + } + + if errno == syscall.EINTR { + continue + } + + if errno == syscall.ENOENT { + return errno + } + + return errRc(retCode) + } + + return nil +} |