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Add clone3 and statx syscalls #40

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Add clone3 and statx syscalls #40

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78cd120
Add clone syscall
MasloMaslane Nov 27, 2023
71b2745
Add statx syscall
MasloMaslane Nov 27, 2023
57370da
Fix typo
MasloMaslane Nov 27, 2023
6b99854
Block clone3 with ENOSYS
MasloMaslane Nov 29, 2023
dcb2d92
Add fstatat64
MasloMaslane Nov 29, 2023
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7 changes: 7 additions & 0 deletions src/limits/ThreadsLimitListener.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#include "seccomp/SeccompRule.h"
#include "seccomp/action/ActionAllow.h"
#include "seccomp/action/ActionKill.h"
#include "seccomp/action/ActionErrno.h"
#include "seccomp/filter/LibSeccompFilter.h"

#include <cstdint>
Expand All @@ -25,6 +26,8 @@ ThreadsLimitListener::ThreadsLimitListener(int32_t threadsLimit)
// Disable threads support
syscallRules_.emplace_back(
seccomp::SeccompRule("clone", seccomp::action::ActionKill{}));
syscallRules_.emplace_back(
seccomp::SeccompRule("clone3", seccomp::action::ActionKill{}));
}
else {
// Enable threads support
Expand All @@ -38,6 +41,10 @@ ThreadsLimitListener::ThreadsLimitListener(int32_t threadsLimit)
seccomp::action::ActionKill(),
(Arg(2) & CLONE_VM) == 0));

syscallRules_.emplace_back(seccomp::SeccompRule(
"clone3",
seccomp::action::ActionErrno(ENOSYS)));

// And various thread related
syscallRules_.emplace_back(seccomp::SeccompRule(
// TODO: allow sleep up to time limit
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2 changes: 2 additions & 0 deletions src/seccomp/policy/DefaultPolicy.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,7 @@ void DefaultPolicy::addFileSystemAccessRules(bool readOnly) {
"stat64",
"fstat",
"fstat64",
"fstatat64",
"newfstatat",
"lstat",
"lstat64",
Expand All @@ -176,6 +177,7 @@ void DefaultPolicy::addFileSystemAccessRules(bool readOnly) {
"statfs64",
"fstatfs",
"fstatfs64",
"statx",
}) {
rules_.emplace_back(SeccompRule(syscall, action::ActionErrno(ENOSYS)));
}
Expand Down