diff options
| author | Neel Natu <neelnatu@google.com> | 2019-06-20 12:54:40 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-06-20 12:56:00 -0700 |
| commit | 0b2135072d3a6b418f87f166b58dcf877f7c2fba (patch) | |
| tree | 40c316afa59e5786fac24b7e8be940ae645ffb16 /pkg/sentry/syscalls | |
| parent | b46ec3704b60bebdd63a597c62f3f471ee0d9be9 (diff) | |
Implement madvise(MADV_DONTFORK)
PiperOrigin-RevId: 254253777
Diffstat (limited to 'pkg/sentry/syscalls')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_mmap.go | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_mmap.go b/pkg/sentry/syscalls/linux/sys_mmap.go index 8a45dceeb..d831833bc 100644 --- a/pkg/sentry/syscalls/linux/sys_mmap.go +++ b/pkg/sentry/syscalls/linux/sys_mmap.go @@ -180,6 +180,10 @@ func Madvise(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysca switch adv { case linux.MADV_DONTNEED: return 0, nil, t.MemoryManager().Decommit(addr, length) + case linux.MADV_DOFORK: + return 0, nil, t.MemoryManager().SetDontFork(addr, length, false) + case linux.MADV_DONTFORK: + return 0, nil, t.MemoryManager().SetDontFork(addr, length, true) case linux.MADV_HUGEPAGE, linux.MADV_NOHUGEPAGE: fallthrough case linux.MADV_MERGEABLE, linux.MADV_UNMERGEABLE: @@ -191,7 +195,7 @@ func Madvise(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysca case linux.MADV_NORMAL, linux.MADV_RANDOM, linux.MADV_SEQUENTIAL, linux.MADV_WILLNEED: // Do nothing, we totally ignore the suggestions above. return 0, nil, nil - case linux.MADV_REMOVE, linux.MADV_DOFORK, linux.MADV_DONTFORK: + case linux.MADV_REMOVE: // These "suggestions" have application-visible side effects, so we // have to indicate that we don't support them. return 0, nil, syserror.ENOSYS |