diff options
| author | Neel Natu <neelnatu@google.com> | 2018-08-10 10:25:37 -0700 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2018-08-10 10:27:09 -0700 |
| commit | d5b702b64f05a200ed94f0cd977d3f84dae01162 (patch) | |
| tree | 73b6583194974df0a2b473c9a824091f3707a3b1 /pkg/sentry/syscalls/linux | |
| parent | 0ac912f99e44e8e89985dd83ec946deadbfd8797 (diff) | |
Validate FS.base before establishing it in the task's register set.
PiperOrigin-RevId: 208229341
Change-Id: I5d84bc52bbafa073446ef497e56958d0d7955aa8
Diffstat (limited to 'pkg/sentry/syscalls/linux')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_tls.go | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_tls.go b/pkg/sentry/syscalls/linux/sys_tls.go index 1047364b3..b95d62320 100644 --- a/pkg/sentry/syscalls/linux/sys_tls.go +++ b/pkg/sentry/syscalls/linux/sys_tls.go @@ -22,6 +22,7 @@ import ( "gvisor.googlesource.com/gvisor/pkg/abi/linux" "gvisor.googlesource.com/gvisor/pkg/sentry/arch" "gvisor.googlesource.com/gvisor/pkg/sentry/kernel" + "gvisor.googlesource.com/gvisor/pkg/sentry/usermem" ) // ArchPrctl implements linux syscall arch_prctl(2). @@ -36,9 +37,13 @@ func ArchPrctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sys } case linux.ARCH_SET_FS: + fsbase := args[1].Uint64() + if _, ok := t.MemoryManager().CheckIORange(usermem.Addr(fsbase), 0); !ok { + return 0, nil, syscall.EPERM + } regs := &t.Arch().StateData().Regs regs.Fs = 0 - regs.Fs_base = args[1].Uint64() + regs.Fs_base = fsbase default: return 0, nil, syscall.EINVAL |