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authorJianfeng Tan <henry.tjf@antfin.com>2019-08-19 11:15:49 +0800
committerJianfeng Tan <henry.tjf@antfin.com>2019-08-22 15:25:38 +0000
commit96f78e24668da189f78212e8c23951a461e14a8c (patch)
tree34205ee6b4eeaf6e4f6adfad78e5c1a27bda757e /runsc/cmd/capability_test.go
parent8d9276ed564ffef5d12426e839aeef7de5164d7d (diff)
unix: return zero if peer is closed
Previously, recvmsg() on a unix stream socket with its peer closed will never return, with goroutine call trace like this: ... 2 in gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).block at pkg/sentry/kernel/task_block.go:124 3 in gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).BlockWithDeadline at pkg/sentry/kernel/task_block.go:69 4 in gvisor.dev/gvisor/pkg/sentry/socket/unix.(*SocketOperations).RecvMsg at pkg/sentry/socket/unix/unix.go:612 5 in gvisor.dev/gvisor/pkg/sentry/syscalls/linux.recvFrom at pkg/sentry/syscalls/linux/sys_socket.go:885 6 in gvisor.dev/gvisor/pkg/sentry/syscalls/linux.RecvFrom at pkg/sentry/syscalls/linux/sys_socket.go:910 ... The issue is caused by that ErrClosedForReceive returned by unix/transport.queue is turned into nil in unix.(*EndpointReader).ReadToBlocks(): err.ToError() As a result, in unix.(*SocketOperations).RecvMsg(): n == 0 and err == nil We shall differentiate it from another case - no data to read where ErrWouldBlock shall be returned; and return 0 immediately. Fixes: #734 Reported-by: chenglang.hy <chenglang.hy@antfin.com> Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
Diffstat (limited to 'runsc/cmd/capability_test.go')
0 files changed, 0 insertions, 0 deletions