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Redbean: Support for unshare() mount() prctl() in Lua #801

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Redbean: Support for unshare() mount() prctl() in Lua #801

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fa51bc6
Add Mount and Unmount Bindings to Lua-Unix
yael333 Apr 8, 2023
bc0034c
Add prtcl Bindings to Lua-Unix
yael333 Apr 8, 2023
8320b37
Added mount Flag Fields for Lua-Unix
yael333 Apr 8, 2023
da887b5
Feedback Corrections for LuaUnixPrctl
yael333 Apr 9, 2023
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219 changes: 218 additions & 1 deletion third_party/lua/lunix.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
#include "libc/calls/cp.internal.h"
#include "libc/calls/ioctl.h"
#include "libc/calls/makedev.h"
#include "libc/calls/mount.h"
#include "libc/calls/pledge.h"
#include "libc/calls/struct/bpf.h"
#include "libc/calls/struct/dirent.h"
Expand Down Expand Up @@ -81,11 +82,13 @@
#include "libc/sysv/consts/limits.h"
#include "libc/sysv/consts/log.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/mount.h"
#include "libc/sysv/consts/msg.h"
#include "libc/sysv/consts/nr.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/ok.h"
#include "libc/sysv/consts/poll.h"
#include "libc/sysv/consts/pr.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/rlim.h"
#include "libc/sysv/consts/rlimit.h"
Expand Down Expand Up @@ -3196,6 +3199,71 @@ static int LuaUnixFdopendir(lua_State *L) {
}
}


// unix.mount(source:str, target:str, filesystemtype: str[, mountflags: int[, data: str]])
// ├─→ true
// ├─→ nil, unix.Errno
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Minor tweak, but the character should be └ (as n prctl).

static int LuaUnixMount(lua_State *L) {
int olderr = errno;
return SysretBool(
L, "mount", olderr,
mount(luaL_checkstring(L, 1), luaL_checkstring(L, 2), luaL_checkstring(L, 3),
luaL_optinteger(L, 4, 0), luaL_optstring(L, 5, NULL)));
}

// unix.umount(target: str[, flags: int)
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Missing closing ].

// ├─→ true
// ├─→ nil, unix.Errrno
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Minor tweak, but the character should be └ (as n prctl).

static int LuaUnixUnmount(lua_State *L) {
int olderr = errno;
return SysretBool(
L, "unmount", olderr,
unmount(luaL_checkstring(L, 1), luaL_optinteger(L, 2, 0)));
}

// unix.prctl(option: int[, arg2: int[, arg3: int[, arg4: int[, arg5: int]]]])
// ├─→ result: int
// └─→ nil, unix.Errno
static int LuaUnixPrctl(lua_State *L) {
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@pkulchenko pkulchenko Jul 6, 2023 •
edited
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None of the get-like prctl variants are going to work, as there is no way to get the values back to the Lua layer. These values either need to be returned as prctl results (it seems like most of them are stored as arg2, so may be need to be returned as a string or number) or need to be taken as one table parameter, in which case the table can be modified to pass the values back. The first option is going to be more consistent with how the rest of unix.* functions operate.

I'm not familiar with the implementation details of prctl to access its coverage in cosmopolitan, but I'm sure @jart can comment on that.

int olderr;
int option;
int status;
unsigned long arg2 = 0, arg3 = 0, arg4 = 0, arg5 = 0;

olderr = errno;
option = luaL_checkinteger(L, 1);
if (lua_gettop(L) >= 2) {
arg2 = lua_tointegerx(L, 2, &status);
if (!status) {
arg2 = (unsigned long)lua_tostring(L, 2);
}
}

if (lua_gettop(L) >= 3) {
arg3 = lua_tointegerx(L, 3, &status);
if (!status) {
arg3 = (unsigned long)lua_tostring(L, 3);
}
}

if (lua_gettop(L) >= 4) {
arg4 = lua_tointegerx(L, 4, &status);
if (!status) {
arg4 = (unsigned long)lua_tostring(L, 4);
}
}

if (lua_gettop(L) >= 5) {
arg5 = lua_tointegerx(L, 5, &status);
if (!status) {
arg5 = (unsigned long)lua_tostring(L, 5);
}
}
return SysretInteger(
L, "prctl", olderr,
prctl(option, arg2, arg3, arg4, arg5));
}

static const luaL_Reg kLuaUnixDirMeth[] = {
{"close", LuaUnixDirClose}, //
{"read", LuaUnixDirRead}, //
Expand Down Expand Up @@ -3288,12 +3356,14 @@ static const luaL_Reg kLuaUnix[] = {
{"mapshared", LuaUnixMapshared}, // mmap(MAP_SHARED) w/ mutex+atomics
{"minor", LuaUnixMinor}, // extract device info
{"mkdir", LuaUnixMkdir}, // make directory
{"mount", LuaUnixMount}, // mount filesystem
{"nanosleep", LuaUnixNanosleep}, // sleep w/ nano precision
{"open", LuaUnixOpen}, // open file fd at lowest slot
{"opendir", LuaUnixOpendir}, // read directory entry list
{"pipe", LuaUnixPipe}, // create two anon fifo fds
{"pledge", LuaUnixPledge}, // enables syscall sandbox
{"poll", LuaUnixPoll}, // waits for file descriptor events
{"prctl", LuaUnixPrctl}, // operations on a process or thread
{"raise", LuaUnixRaise}, // signal this process
{"read", LuaUnixRead}, // read from file or socket
{"readlink", LuaUnixReadlink}, // reads symbolic link
Expand Down Expand Up @@ -3337,6 +3407,7 @@ static const luaL_Reg kLuaUnix[] = {
{"truncate", LuaUnixTruncate}, // shrink or extend file medium
{"umask", LuaUnixUmask}, // set default file mask
{"unlink", LuaUnixUnlink}, // remove file
{"unmount", LuaUnixUnmount}, // unmount filesystem
{"unveil", LuaUnixUnveil}, // filesystem sandboxing
{"utimensat", LuaUnixUtimensat}, // change access/modified time
{"wait", LuaUnixWait}, // wait for child to change status
Expand Down Expand Up @@ -3533,7 +3604,153 @@ int LuaUnix(lua_State *L) {
LuaSetIntField(L, "PLEDGE_PENALTY_RETURN_EPERM", PLEDGE_PENALTY_RETURN_EPERM);
LuaSetIntField(L, "PLEDGE_STDERR_LOGGING", PLEDGE_STDERR_LOGGING);

// statfs::f_flags
// mount() / unmount() options
LuaSetIntField(L, "MS_RDONLY", MS_RDONLY);
LuaSetIntField(L, "MNT_RDONLY", MNT_RDONLY);
LuaSetIntField(L, "MS_NOSUID", MS_NOSUID);
LuaSetIntField(L, "MNT_NOSUID", MNT_NOSUID);
LuaSetIntField(L, "MS_NODEV", MS_NODEV);
LuaSetIntField(L, "MNT_NODEV", MNT_NODEV);
LuaSetIntField(L, "MS_NOEXEC", MS_NOEXEC);
LuaSetIntField(L, "MNT_NOEXEC", MNT_NOEXEC);
LuaSetIntField(L, "MS_SYNCHRONOUS", MS_SYNCHRONOUS);
LuaSetIntField(L, "MNT_SYNCHRONOUS", MNT_SYNCHRONOUS);
LuaSetIntField(L, "MS_REMOUNT", MS_REMOUNT);
LuaSetIntField(L, "MNT_UPDATE", MNT_UPDATE);
LuaSetIntField(L, "MS_MANDLOCK", MS_MANDLOCK);
LuaSetIntField(L, "MS_DIRSYNC", MS_DIRSYNC);
LuaSetIntField(L, "MS_NOATIME", MS_NOATIME);
LuaSetIntField(L, "MNT_NOATIME", MNT_NOATIME);
LuaSetIntField(L, "MS_NODIRATIME", MS_NODIRATIME);
LuaSetIntField(L, "MS_BIND", MS_BIND);
LuaSetIntField(L, "MS_MOVE", MS_MOVE);
LuaSetIntField(L, "MS_REC", MS_REC);
LuaSetIntField(L, "MS_SILENT", MS_SILENT);
LuaSetIntField(L, "MS_POSIXACL", MS_POSIXACL);
LuaSetIntField(L, "MS_UNBINDABLE", MS_UNBINDABLE);
LuaSetIntField(L, "MS_PRIVATE", MS_PRIVATE);
LuaSetIntField(L, "MS_SLAVE", MS_SLAVE);
LuaSetIntField(L, "MS_SHARED", MS_SHARED);
LuaSetIntField(L, "MS_RELATIME", MS_RELATIME);
LuaSetIntField(L, "MNT_RELATIME", MNT_RELATIME);
LuaSetIntField(L, "MS_KERNMOUNT", MS_KERNMOUNT);
LuaSetIntField(L, "MS_I_VERSION", MS_I_VERSION);
LuaSetIntField(L, "MS_STRICTATIME", MS_STRICTATIME);
LuaSetIntField(L, "MNT_STRICTATIME", MNT_STRICTATIME);
LuaSetIntField(L, "MS_LAZYTIME", MS_LAZYTIME);
LuaSetIntField(L, "MS_ACTIVE", MS_ACTIVE);
LuaSetIntField(L, "MS_NOUSER", MS_NOUSER);
LuaSetIntField(L, "MS_RMT_MASK", MS_RMT_MASK);
LuaSetIntField(L, "MS_MGC_VAL", MS_MGC_VAL);
LuaSetIntField(L, "MS_MGC_MSK", MS_MGC_MSK);
LuaSetIntField(L, "MNT_ASYNC", MNT_ASYNC);
LuaSetIntField(L, "MNT_RELOAD", MNT_RELOAD);
LuaSetIntField(L, "MNT_SUIDDIR", MNT_SUIDDIR);
LuaSetIntField(L, "MNT_NOCLUSTERR", MNT_NOCLUSTERR);
LuaSetIntField(L, "MNT_NOCLUSTERW", MNT_NOCLUSTERW);
LuaSetIntField(L, "MNT_SNAPSHOT", MNT_SNAPSHOT);

// prctl() options
LuaSetIntField(L, "PR_GET_SECCOMP", PR_GET_SECCOMP);
LuaSetIntField(L, "PR_SET_SECCOMP", PR_SET_SECCOMP);
LuaSetIntField(L, "SECCOMP_MODE_DISABLED", SECCOMP_MODE_DISABLED);
LuaSetIntField(L, "SECCOMP_MODE_STRICT", SECCOMP_MODE_STRICT);
LuaSetIntField(L, "SECCOMP_MODE_FILTER", SECCOMP_MODE_FILTER);

LuaSetIntField(L, "PR_CAPBSET_READ", PR_CAPBSET_READ);
LuaSetIntField(L, "PR_CAPBSET_DROP", PR_CAPBSET_DROP);

LuaSetIntField(L, "PR_SET_NO_NEW_PRIVS", PR_SET_NO_NEW_PRIVS);
LuaSetIntField(L, "PR_GET_NO_NEW_PRIVS", PR_GET_NO_NEW_PRIVS);

LuaSetIntField(L, "PR_SET_NAME", PR_SET_NAME);
LuaSetIntField(L, "PR_GET_NAME", PR_GET_NAME);

LuaSetIntField(L, "PR_GET_TSC", PR_GET_TSC);
LuaSetIntField(L, "PR_SET_TSC", PR_SET_TSC);
LuaSetIntField(L, "PR_TSC_ENABLE", PR_TSC_ENABLE);
LuaSetIntField(L, "PR_TSC_SIGSEGV", PR_TSC_SIGSEGV);

LuaSetIntField(L, "PR_GET_FPEXC", PR_GET_FPEXC);
LuaSetIntField(L, "PR_SET_FPEXC", PR_SET_FPEXC);
LuaSetIntField(L, "PR_FP_EXC_SW_ENABLE", PR_FP_EXC_SW_ENABLE);
LuaSetIntField(L, "PR_FP_EXC_DIV", PR_FP_EXC_DIV);
LuaSetIntField(L, "PR_FP_EXC_OVF", PR_FP_EXC_OVF);
LuaSetIntField(L, "PR_FP_EXC_UND", PR_FP_EXC_UND);
LuaSetIntField(L, "PR_FP_EXC_RES", PR_FP_EXC_RES);
LuaSetIntField(L, "PR_FP_EXC_INV", PR_FP_EXC_INV);
LuaSetIntField(L, "PR_FP_EXC_DISABLED", PR_FP_EXC_DISABLED);
LuaSetIntField(L, "PR_FP_EXC_NONRECOV", PR_FP_EXC_NONRECOV);
LuaSetIntField(L, "PR_FP_EXC_ASYNC", PR_FP_EXC_ASYNC);
LuaSetIntField(L, "PR_FP_EXC_PRECISE", PR_FP_EXC_PRECISE);

LuaSetIntField(L, "PR_MCE_KILL_CLEAR", PR_MCE_KILL_CLEAR);
LuaSetIntField(L, "PR_MCE_KILL_LATE", PR_MCE_KILL_LATE);
LuaSetIntField(L, "PR_SPEC_NOT_AFFECTED", PR_SPEC_NOT_AFFECTED);
LuaSetIntField(L, "PR_SPEC_STORE_BYPASS", PR_SPEC_STORE_BYPASS);
LuaSetIntField(L, "PR_CAP_AMBIENT_IS_SET", PR_CAP_AMBIENT_IS_SET);
LuaSetIntField(L, "PR_FPEMU_NOPRINT", PR_FPEMU_NOPRINT);
LuaSetIntField(L, "PR_MCE_KILL_EARLY", PR_MCE_KILL_EARLY);
LuaSetIntField(L, "PR_MCE_KILL_SET", PR_MCE_KILL_SET);
LuaSetIntField(L, "PR_SET_MM_START_CODE", PR_SET_MM_START_CODE);
LuaSetIntField(L, "PR_SET_PDEATHSIG", PR_SET_PDEATHSIG);
LuaSetIntField(L, "PR_SPEC_PRCTL", PR_SPEC_PRCTL);
LuaSetIntField(L, "PR_CAP_AMBIENT_RAISE", PR_CAP_AMBIENT_RAISE);
LuaSetIntField(L, "PR_FPEMU_SIGFPE", PR_FPEMU_SIGFPE);
LuaSetIntField(L, "PR_GET_PDEATHSIG", PR_GET_PDEATHSIG);
LuaSetIntField(L, "PR_MCE_KILL_DEFAULT", PR_MCE_KILL_DEFAULT);
LuaSetIntField(L, "PR_SET_MM_END_CODE", PR_SET_MM_END_CODE);
LuaSetIntField(L, "PR_SPEC_ENABLE", PR_SPEC_ENABLE);
LuaSetIntField(L, "PR_CAP_AMBIENT_LOWER", PR_CAP_AMBIENT_LOWER);
LuaSetIntField(L, "PR_GET_DUMPABLE", PR_GET_DUMPABLE);
LuaSetIntField(L, "PR_SET_MM_START_DATA", PR_SET_MM_START_DATA);
LuaSetIntField(L, "PR_CAP_AMBIENT_CLEAR_ALL", PR_CAP_AMBIENT_CLEAR_ALL);
LuaSetIntField(L, "PR_SET_DUMPABLE", PR_SET_DUMPABLE);
LuaSetIntField(L, "PR_SET_MM_END_DATA", PR_SET_MM_END_DATA);
LuaSetIntField(L, "PR_SPEC_DISABLE", PR_SPEC_DISABLE);
LuaSetIntField(L, "PR_SET_MM_START_STACK", PR_SET_MM_START_STACK);
LuaSetIntField(L, "PR_SET_MM_START_BRK", PR_SET_MM_START_BRK);
LuaSetIntField(L, "PR_GET_KEEPCAPS", PR_GET_KEEPCAPS);
LuaSetIntField(L, "PR_SET_MM_BRK", PR_SET_MM_BRK);
LuaSetIntField(L, "PR_SET_KEEPCAPS", PR_SET_KEEPCAPS);
LuaSetIntField(L, "PR_SET_MM_ARG_START", PR_SET_MM_ARG_START);
LuaSetIntField(L, "PR_SPEC_FORCE_DISABLE", PR_SPEC_FORCE_DISABLE);
LuaSetIntField(L, "PR_GET_FPEMU", PR_GET_FPEMU);
LuaSetIntField(L, "PR_SET_MM_ARG_END", PR_SET_MM_ARG_END);
LuaSetIntField(L, "PR_SET_FPEMU", PR_SET_FPEMU);
LuaSetIntField(L, "PR_SET_MM_ENV_START", PR_SET_MM_ENV_START);
LuaSetIntField(L, "PR_GET_FPEXC", PR_GET_FPEXC);
LuaSetIntField(L, "PR_SET_MM_ENV_END", PR_SET_MM_ENV_END);
LuaSetIntField(L, "PR_SET_FPEXC", PR_SET_FPEXC);
LuaSetIntField(L, "PR_SET_MM_AUXV", PR_SET_MM_AUXV);
LuaSetIntField(L, "PR_SET_MM_EXE_FILE", PR_SET_MM_EXE_FILE);
LuaSetIntField(L, "PR_SET_MM_MAP", PR_SET_MM_MAP);
LuaSetIntField(L, "PR_SET_MM_MAP_SIZE", PR_SET_MM_MAP_SIZE);
LuaSetIntField(L, "PR_GET_TSC", PR_GET_TSC);
LuaSetIntField(L, "PR_SET_TSC", PR_SET_TSC);
LuaSetIntField(L, "PR_GET_SECUREBITS", PR_GET_SECUREBITS);
LuaSetIntField(L, "PR_SET_SECUREBITS", PR_SET_SECUREBITS);
LuaSetIntField(L, "PR_SET_TIMERSLACK", PR_SET_TIMERSLACK);
LuaSetIntField(L, "PR_GET_TIMERSLACK", PR_GET_TIMERSLACK);
LuaSetIntField(L, "PR_TASK_PERF_EVENTS_DISABLE", PR_TASK_PERF_EVENTS_DISABLE);
LuaSetIntField(L, "PR_TASK_PERF_EVENTS_ENABLE", PR_TASK_PERF_EVENTS_ENABLE);
LuaSetIntField(L, "PR_MCE_KILL", PR_MCE_KILL);
LuaSetIntField(L, "PR_MCE_KILL_GET", PR_MCE_KILL_GET);
LuaSetIntField(L, "PR_SET_MM", PR_SET_MM);
LuaSetIntField(L, "PR_SET_CHILD_SUBREAPER", PR_SET_CHILD_SUBREAPER);
LuaSetIntField(L, "PR_GET_CHILD_SUBREAPER", PR_GET_CHILD_SUBREAPER);
LuaSetIntField(L, "PR_GET_TID_ADDRESS", PR_GET_TID_ADDRESS);
LuaSetIntField(L, "PR_SET_THP_DISABLE", PR_SET_THP_DISABLE);
LuaSetIntField(L, "PR_GET_THP_DISABLE", PR_GET_THP_DISABLE);
LuaSetIntField(L, "PR_MPX_ENABLE_MANAGEMENT", PR_MPX_ENABLE_MANAGEMENT);
LuaSetIntField(L, "PR_MPX_DISABLE_MANAGEMENT", PR_MPX_DISABLE_MANAGEMENT);
LuaSetIntField(L, "PR_CAP_AMBIENT", PR_CAP_AMBIENT);
LuaSetIntField(L, "PR_GET_SPECULATION_CTRL", PR_GET_SPECULATION_CTRL);
LuaSetIntField(L, "PR_SET_SPECULATION_CTRL", PR_SET_SPECULATION_CTRL);
LuaSetIntField(L, "PR_SET_PTRACER", PR_SET_PTRACER);
LuaSetIntField(L, "PR_SET_PTRACER_ANY", PR_SET_PTRACER_ANY);

// statfs::f_flags
LuaSetIntField(L, "ST_RDONLY", ST_RDONLY);
LuaSetIntField(L, "ST_NOSUID", ST_NOSUID);
LuaSetIntField(L, "ST_NODEV", ST_NODEV);
Expand Down