463e73d46d
This is a defense-in-depth measure. If the sentry is compromised, this prevents system call injection to the stubs. There is some complexity with respect to ptrace and seccomp interactions, so this protection is not really available for kernel versions < 4.8; this is detected dynamically. Note that this also solves the vsyscall emulation issue by adding in appropriate trapping for those system calls. It does mean that a compromised sentry could theoretically inject these into the stub (ignoring the trap and resume, thereby allowing execution), but they are harmless. PiperOrigin-RevId: 216647581 Change-Id: Id06c232cbac1f9489b1803ec97f83097fcba8eb8 |
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| .. | ||
| filemem | ||
| interrupt | ||
| kvm | ||
| procid | ||
| ptrace | ||
| ring0 | ||
| safecopy | ||
| BUILD | ||
| context.go | ||
| mmap_min_addr.go | ||
| platform.go | ||