PR_SET_NO_NEW_PRIVS（38） (since Linux 3.5) Set the calling thread's no_new_privs bit to the value in arg2. With no_new_privs set to 1, execve(2) promises not to grant privileges to do anything that could not have been done without the execve(2)call(for example, rendering the set-user-ID and set-group-ID mode bits, and file capabilities non-functional). Once set, this bit cannot be unset. The setting of this bit is inherited by children created by fork(2) and clone(2), and pre‐ served across execve(2).
PR_SET_SECCOMP (since Linux 2.6.23) Set the secure computing (seccomp) mode for the calling thread, to limit the available system calls. The more recent seccomp(2) system call provides a superset of the functionality of PR_SET_SECCOMP.
The seccomp mode is selected via arg2. (The seccomp constants are defined in <linux/seccomp.h>.)
With arg2 set to SECCOMP_MODE_STRICT, the only system calls that the thread is permitted to make are read(2), write(2), _exit(2) (but not exit_group(2)), and sigreturn(2). Other system calls result in the delivery of a SIGKILL signal. Strict secure computing mode is useful for number-crunching applications that may need to execute untrusted byte code, perhaps obtained by reading from a pipe or socket. This operation is available only if the kernel is configured with CONFIG_SECCOMP enabled.
With arg2 set to SECCOMP_MODE_FILTER (since Linux 3.5), the system calls allowed are defined by a pointer to a Berkeley Packet Filter passed in arg3. This argument is a pointer to structsock_fprog; it can be designed to filter arbitrary system calls and system call arguments. This mode is available only if the kernel is configured with CONFIG_SECCOMP_FILTER enabled.
If SECCOMP_MODE_FILTER filters permit fork(2), then the seccomp mode is inherited by children created by fork(2); ifexecve(2) is permitted, then the seccomp mode is preserved across execve(2). If the filters permit prctl() calls, then additional filters can be added; they are run in order until the first non- allow result is seen.
For further information, see the kernel source file Documentation/prctl/seccomp_filter.txt.
/** * Kill the process */ #define SCMP_ACT_KILL 0x00000000U /** * Throw a SIGSYS signal */ #define SCMP_ACT_TRAP 0x00030000U /** * Return the specified error code */ #define SCMP_ACT_ERRNO(x) (0x00050000U | ((x) & 0x0000ffffU)) /** * Notify a tracing process with the specified value */ #define SCMP_ACT_TRACE(x) (0x7ff00000U | ((x) & 0x0000ffffU)) /** * Allow the syscall to be executed after the action has been logged */ #define SCMP_ACT_LOG 0x7ffc0000U /** * Allow the syscall to be executed */ #define SCMP_ACT_ALLOW 0x7fff0000U
intseccomp_rule_add(scmp_filter_ctx ctx, uint32_t action, int syscall, unsignedint arg_cnt, ...);
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2、在博客根目录（注意不是archer根目录）执行以下命令： npm i hexo-generator-json-content --save