diff options
Diffstat (limited to 'pkg')
| -rw-r--r-- | pkg/abi/linux/sem.go | 2 | ||||
| -rw-r--r-- | pkg/sentry/kernel/semaphore/semaphore.go | 28 | ||||
| -rw-r--r-- | pkg/sentry/syscalls/linux/linux64.go | 4 | ||||
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_sem.go | 35 |
4 files changed, 62 insertions, 7 deletions
diff --git a/pkg/abi/linux/sem.go b/pkg/abi/linux/sem.go index 0adff8dff..2424884c1 100644 --- a/pkg/abi/linux/sem.go +++ b/pkg/abi/linux/sem.go @@ -43,10 +43,10 @@ const ( SEMVMX = 32767 SEMAEM = SEMVMX - // followings are unused in kernel SEMUME = SEMOPM SEMMNU = SEMMNS SEMMAP = SEMMNS + SEMUSZ = 20 ) const SEM_UNDO = 0x1000 diff --git a/pkg/sentry/kernel/semaphore/semaphore.go b/pkg/sentry/kernel/semaphore/semaphore.go index 3dd3953b3..db01e4a97 100644 --- a/pkg/sentry/kernel/semaphore/semaphore.go +++ b/pkg/sentry/kernel/semaphore/semaphore.go @@ -193,12 +193,26 @@ func (r *Registry) IPCInfo() *linux.SemInfo { SemMsl: linux.SEMMSL, SemOpm: linux.SEMOPM, SemUme: linux.SEMUME, - SemUsz: 0, // SemUsz not supported. + SemUsz: linux.SEMUSZ, SemVmx: linux.SEMVMX, SemAem: linux.SEMAEM, } } +// SemInfo returns a seminfo structure containing the same information as +// for IPC_INFO, except that SemUsz field returns the number of existing +// semaphore sets, and SemAem field returns the number of existing semaphores. +func (r *Registry) SemInfo() *linux.SemInfo { + r.mu.Lock() + defer r.mu.Unlock() + + info := r.IPCInfo() + info.SemUsz = uint32(len(r.semaphores)) + info.SemAem = uint32(r.totalSems()) + + return info +} + // HighestIndex returns the index of the highest used entry in // the kernel's array. func (r *Registry) HighestIndex() int32 { @@ -289,6 +303,18 @@ func (r *Registry) FindByID(id int32) *Set { return r.semaphores[id] } +// FindByIndex looks up a set given an index. +func (r *Registry) FindByIndex(index int32) *Set { + r.mu.Lock() + defer r.mu.Unlock() + + id, present := r.indexes[index] + if !present { + return nil + } + return r.semaphores[id] +} + func (r *Registry) findByKey(key int32) *Set { for _, v := range r.semaphores { if v.key == key { diff --git a/pkg/sentry/syscalls/linux/linux64.go b/pkg/sentry/syscalls/linux/linux64.go index cff442846..b815e498f 100644 --- a/pkg/sentry/syscalls/linux/linux64.go +++ b/pkg/sentry/syscalls/linux/linux64.go @@ -118,7 +118,7 @@ var AMD64 = &kernel.SyscallTable{ 63: syscalls.Supported("uname", Uname), 64: syscalls.Supported("semget", Semget), 65: syscalls.PartiallySupported("semop", Semop, "Option SEM_UNDO not supported.", nil), - 66: syscalls.PartiallySupported("semctl", Semctl, "Options SEM_INFO, SEM_STAT, SEM_STAT_ANY not supported.", nil), + 66: syscalls.PartiallySupported("semctl", Semctl, "Options SEM_STAT_ANY not supported.", nil), 67: syscalls.Supported("shmdt", Shmdt), 68: syscalls.ErrorWithEvent("msgget", syserror.ENOSYS, "", []string{"gvisor.dev/issue/135"}), // TODO(b/29354921) 69: syscalls.ErrorWithEvent("msgsnd", syserror.ENOSYS, "", []string{"gvisor.dev/issue/135"}), // TODO(b/29354921) @@ -619,7 +619,7 @@ var ARM64 = &kernel.SyscallTable{ 188: syscalls.ErrorWithEvent("msgrcv", syserror.ENOSYS, "", []string{"gvisor.dev/issue/135"}), // TODO(b/29354921) 189: syscalls.ErrorWithEvent("msgsnd", syserror.ENOSYS, "", []string{"gvisor.dev/issue/135"}), // TODO(b/29354921) 190: syscalls.Supported("semget", Semget), - 191: syscalls.PartiallySupported("semctl", Semctl, "Options SEM_INFO, SEM_STAT, SEM_STAT_ANY not supported.", nil), + 191: syscalls.PartiallySupported("semctl", Semctl, "Options SEM_STAT_ANY not supported.", nil), 192: syscalls.ErrorWithEvent("semtimedop", syserror.ENOSYS, "", []string{"gvisor.dev/issue/137"}), 193: syscalls.PartiallySupported("semop", Semop, "Option SEM_UNDO not supported.", nil), 194: syscalls.PartiallySupported("shmget", Shmget, "Option SHM_HUGETLB is not supported.", nil), diff --git a/pkg/sentry/syscalls/linux/sys_sem.go b/pkg/sentry/syscalls/linux/sys_sem.go index a62a6b3b5..1166cd7bb 100644 --- a/pkg/sentry/syscalls/linux/sys_sem.go +++ b/pkg/sentry/syscalls/linux/sys_sem.go @@ -155,10 +155,28 @@ func Semctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscal } return uintptr(r.HighestIndex()), nil, nil - case linux.SEM_INFO, - linux.SEM_STAT, - linux.SEM_STAT_ANY: + case linux.SEM_INFO: + buf := args[3].Pointer() + r := t.IPCNamespace().SemaphoreRegistry() + info := r.SemInfo() + if _, err := info.CopyOut(t, buf); err != nil { + return 0, nil, err + } + return uintptr(r.HighestIndex()), nil, nil + case linux.SEM_STAT: + arg := args[3].Pointer() + // id is an index in SEM_STAT. + semid, ds, err := semStat(t, id) + if err != nil { + return 0, nil, err + } + if _, err := ds.CopyOut(t, arg); err != nil { + return 0, nil, err + } + return uintptr(semid), nil, err + + case linux.SEM_STAT_ANY: t.Kernel().EmitUnimplementedEvent(t) fallthrough @@ -203,6 +221,17 @@ func ipcStat(t *kernel.Task, id int32) (*linux.SemidDS, error) { return set.GetStat(creds) } +func semStat(t *kernel.Task, index int32) (int32, *linux.SemidDS, error) { + r := t.IPCNamespace().SemaphoreRegistry() + set := r.FindByIndex(index) + if set == nil { + return 0, nil, syserror.EINVAL + } + creds := auth.CredentialsFromContext(t) + ds, err := set.GetStat(creds) + return set.ID, ds, err +} + func setVal(t *kernel.Task, id int32, num int32, val int16) error { r := t.IPCNamespace().SemaphoreRegistry() set := r.FindByID(id) |