MFp4 @229086:

Make use of Capsicum to protect kdump(1), as it might be used to parse data
from untrusted sources:

- Sandbox kdump(1) using capability mode.
- Limit stdin descriptor (where opened file is moved to) to only
  CAP_READ and CAP_FSTAT rights.
- Limit stdout descriptor to only CAP_WRITE, CAP_FSTAT and CAP_IOCTL.
  Plus limit allowed ioctls to TIOCGETA only, which is needed for
  isatty() to work.
- Limit stderr descriptor to only CAP_WRITE and CAP_FSTAT. In addition
  if the -s option is not given, grant CAP_IOCTL right, but allow for
  TIOCGWINSZ ioctl only, as we need screen width to dump the data.
- Before entering capability mode call catopen("libc", NL_CAT_LOCALE),
  which opens message catalogs and caches data, so that strerror(3)
  and strsignal(3) can work in a sandbox.

Sponsored by:	The FreeBSD Foundation
Discussed with:	rwatson

0 files changed, 0 insertions, 0 deletions