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| author | Zach Koopmans <zkoopmans@google.com> | 2018-12-05 10:52:44 -0800 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2018-12-05 10:53:51 -0800 |
| commit | 06131fe749e3715534f9d551528d89048ae1398b (patch) | |
| tree | 90bdce3e8502bdc0bfb04f2fae589fc09ff1863d /pkg/sentry/syscalls | |
| parent | fab029c50b445e06ba770c9ccd7d6d0a06e15057 (diff) | |
Check for CAP_SYS_RESOURCE in prctl(PR_SET_MM, ...)
If sys_prctl is called with PR_SET_MM without CAP_SYS_RESOURCE,
the syscall should return failure with errno set to EPERM.
See: http://man7.org/linux/man-pages/man2/prctl.2.html
PiperOrigin-RevId: 224182874
Change-Id: I630d1dd44af8b444dd16e8e58a0764a0cf1ad9a3
Diffstat (limited to 'pkg/sentry/syscalls')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_prctl.go | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_prctl.go b/pkg/sentry/syscalls/linux/sys_prctl.go index 91e852049..4938f27bd 100644 --- a/pkg/sentry/syscalls/linux/sys_prctl.go +++ b/pkg/sentry/syscalls/linux/sys_prctl.go @@ -87,6 +87,10 @@ func Prctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscall } case linux.PR_SET_MM: + if !t.HasCapability(linux.CAP_SYS_RESOURCE) { + return 0, nil, syscall.EPERM + } + switch args[1].Int() { case linux.PR_SET_MM_EXE_FILE: fd := kdefs.FD(args[2].Int()) |