diff options
| author | gVisor bot <gvisor-bot@google.com> | 2020-09-04 06:33:55 +0000 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-09-04 06:33:55 +0000 |
| commit | 5bd166a465a48fc359583afcc723f2883a8dc38b (patch) | |
| tree | 85faa1b7381cc052d231cf654e5de93b2b7714ba /pkg/sentry | |
| parent | 27719ce07c53993b758ce7cc3ca298c1f9335b3a (diff) | |
| parent | c564293b65eefcf1342023694e4aae82314de014 (diff) | |
Merge release-20200818.0-123-gc564293b6 (automated)
Diffstat (limited to 'pkg/sentry')
| -rw-r--r-- | pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go | 6 | ||||
| -rw-r--r-- | pkg/sentry/platform/ring0/defs_impl_arm64.go | 2 | ||||
| -rw-r--r-- | pkg/sentry/syscalls/linux/vfs2/splice.go | 22 | ||||
| -rw-r--r-- | pkg/sentry/time/seqatomic_parameters_unsafe.go | 6 |
4 files changed, 21 insertions, 15 deletions
diff --git a/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go b/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go index 90148bbb2..a0f2fe45c 100644 --- a/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go +++ b/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go @@ -1,12 +1,12 @@ package kernel import ( - "fmt" - "reflect" - "strings" "unsafe" + "fmt" "gvisor.dev/gvisor/pkg/sync" + "reflect" + "strings" ) // SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race diff --git a/pkg/sentry/platform/ring0/defs_impl_arm64.go b/pkg/sentry/platform/ring0/defs_impl_arm64.go index 424b66f76..8ebfbfdb6 100644 --- a/pkg/sentry/platform/ring0/defs_impl_arm64.go +++ b/pkg/sentry/platform/ring0/defs_impl_arm64.go @@ -1,10 +1,10 @@ package ring0 import ( - "gvisor.dev/gvisor/pkg/sentry/arch" "gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables" "fmt" + "gvisor.dev/gvisor/pkg/sentry/arch" "gvisor.dev/gvisor/pkg/usermem" "io" "reflect" diff --git a/pkg/sentry/syscalls/linux/vfs2/splice.go b/pkg/sentry/syscalls/linux/vfs2/splice.go index 68ce94778..5543cfac2 100644 --- a/pkg/sentry/syscalls/linux/vfs2/splice.go +++ b/pkg/sentry/syscalls/linux/vfs2/splice.go @@ -18,6 +18,7 @@ import ( "io" "gvisor.dev/gvisor/pkg/abi/linux" + "gvisor.dev/gvisor/pkg/log" "gvisor.dev/gvisor/pkg/sentry/arch" "gvisor.dev/gvisor/pkg/sentry/kernel" "gvisor.dev/gvisor/pkg/sentry/kernel/pipe" @@ -390,16 +391,21 @@ func Sendfile(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysc err = dw.waitForOut(t) } if err != nil { - // We didn't complete the write. Only - // report the bytes that were actually - // written, and rewind the offset. + // We didn't complete the write. Only report the bytes that were actually + // written, and rewind offsets as needed. notWritten := int64(len(wbuf)) n -= notWritten - if offset != -1 { - // TODO(gvisor.dev/issue/3779): The inFile offset will be incorrect if we - // roll back, because it has already been advanced by the full amount. - // Merely seeking on inFile does not work, because there may be concurrent - // file operations. + if offset == -1 { + // We modified the offset of the input file itself during the read + // operation. Rewind it. + if _, seekErr := inFile.Seek(t, -notWritten, linux.SEEK_CUR); seekErr != nil { + // Log the error but don't return it, since the write has already + // completed successfully. + log.Warningf("failed to roll back input file offset: %v", seekErr) + } + } else { + // The sendfile call was provided an offset parameter that should be + // adjusted to reflect the number of bytes sent. Rewind it. offset -= notWritten } break diff --git a/pkg/sentry/time/seqatomic_parameters_unsafe.go b/pkg/sentry/time/seqatomic_parameters_unsafe.go index 2cb001080..f18440378 100644 --- a/pkg/sentry/time/seqatomic_parameters_unsafe.go +++ b/pkg/sentry/time/seqatomic_parameters_unsafe.go @@ -1,12 +1,12 @@ package time import ( - "fmt" - "reflect" - "strings" "unsafe" + "fmt" "gvisor.dev/gvisor/pkg/sync" + "reflect" + "strings" ) // SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race |