diff options
| author | Aleksandr Nogikh <nogikh@google.com> | 2023-12-18 11:58:39 +0100 |
|---|---|---|
| committer | Aleksandr Nogikh <nogikh@google.com> | 2023-12-19 00:16:19 +0000 |
| commit | 3ad490ea48468e50fe91f6f6b2ca4cbc74d924bf (patch) | |
| tree | d6960156ac4fcbeb908fbbbba79c8716d8e47172 /pkg | |
| parent | 924661f4beda6a647079237cc843df44626fc44b (diff) | |
executor: introduce syz_pidfd_open()
This kernel interface provides access to fds of other processes, which
is readily abused by the fuzzer to mangle parent syz-executor fds.
Pid=1 is the parent syz-executor process when PID namespace is created.
Sanitize it in the new syz_pidfd_open() pseudo-syscall.
We could not patch the argument in sys/linux/init.go because the first
argument is a resource.
Diffstat (limited to 'pkg')
| -rw-r--r-- | pkg/csource/generated.go | 12 | ||||
| -rw-r--r-- | pkg/host/syscalls_linux.go | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/pkg/csource/generated.go b/pkg/csource/generated.go index 4c3fae47c..e65b95095 100644 --- a/pkg/csource/generated.go +++ b/pkg/csource/generated.go @@ -11823,6 +11823,18 @@ static void setup_swap() #endif +#if SYZ_EXECUTOR || __NR_syz_pidfd_open +#include <sys/syscall.h> +static long syz_pidfd_open(volatile long pid, volatile long flags) +{ + if (pid == 1) { + pid = 0; + } + return syscall(__NR_pidfd_open, pid, flags); +} + +#endif + #elif GOOS_test #include <stdlib.h> diff --git a/pkg/host/syscalls_linux.go b/pkg/host/syscalls_linux.go index b1bcbfb8b..d59fe491b 100644 --- a/pkg/host/syscalls_linux.go +++ b/pkg/host/syscalls_linux.go @@ -327,6 +327,7 @@ var syzkallSupport = map[string]func(*prog.Syscall, *prog.Target, string) (bool, "syz_clone3": alwaysSupported, "syz_pkey_set": isSyzPkeySetSupported, "syz_socket_connect_nvme_tcp": isSyzSocketConnectNvmeTCPSupported, + "syz_pidfd_open": alwaysSupported, } func isSupportedSyzkall(c *prog.Syscall, target *prog.Target, sandbox string) (bool, string) { |