mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-23 05:42:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Add seccomp bpf sandboxing to redbean

Browse source 
It's now possible to pass the `-S` or `-SS` flags to sandbox redbean
worker proecsses after they've been forked. The first `-S` flag is
intended to be a permissive builtin policy that limits system calls to
only that which the various parts of redbean serving need. The second
`-SS` flag is intended to be more restrictive, preventing things like
the Lua extensions you download off the web from using the HTTP client
or sockets APIs. In upcoming changes you'll be able to implement your
own Berkeley Packet Filter sandbox programs and load them via Lua.
This commit is contained in:
Justine Tunney 2022-04-18 08:54:42 -07:00
parent 7166679620
commit 5a132f9652
79 changed files with 2271 additions and 651 deletions
Download patch file Download diff file Expand all files Collapse all files

33
libc/intrin/kprintf.greg.c
View file

@ -246,7 +246,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
const char *s, *f;
unsigned long long x;
unsigned i, j, m, rem, sign, hash, cols, prec;
char c, *p, *e, pdot, zero, flip, dang, base, quot, z[128];
char c, *p, *e, pdot, zero, flip, dang, base, quot, uppr, z[128];
if (kistextpointer(b) || kisdangerous(b)) n = 0;
if (!kistextpointer(fmt)) fmt = "!!WONTFMT";
p = b;
@ -270,6 +270,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
type = 0;
cols = 0;
zero = 0;
uppr = 0;
abet = "0123456789abcdef";
for (;;) {
switch ((c = *f++)) {
@ -302,6 +303,10 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
sign = c;
continue;
case '^':
uppr = c;
continue;
case 'h':
--type;
continue;
@ -507,6 +512,12 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
type = 0;
goto FormatString;
} else {
if (p + 4 <= e) {
*p++ = 'e';
*p++ = 'r';
*p++ = 'r';
*p++ = '=';
}
type = 0;
x = unixerr;
goto FormatDecimal;
@ -558,10 +569,6 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
goto FormatString;
}
case 'S':
c = 's';
type = 1;
// fallthrough
case 's':
if (!(s = va_arg(va, const void *))) {
s = sign != ' ' ? "NULL" : "";
@ -598,6 +605,9 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
if ((t & 0300) == 0200) goto ActuallyEmitByte;
++i;
EmitByte:
if (uppr && 'a' <= t && t <= 'z') {
t -= 'a' - 'A';
}
if (UNLIKELY(quot) && (t == '\\' || ((t == '"' && c == 's') ||
(t == '\'' && c == 'c')))) {
if (p + 2 <= e) {
@ -671,9 +681,15 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
if (!t) break;
++i;
EmitChar:
if (t <= 0x7f) {
goto EmitByte;
} else if (t <= 0x7ff) {
if (t <= 0x7f) goto EmitByte;
if (uppr) {
if (weaken(towupper)) {
t = weaken(towupper)(t);
} else if (uppr && 'a' <= t && t <= 'z') {
t -= 'a' - 'A';
}
}
if (t <= 0x7ff) {
if (p + 2 <= e) {
p[0] = 0300 | (t >> 6);
p[1] = 0200 | (t & 077);
@ -886,6 +902,7 @@ privileged void kvprintf(const char *fmt, va_list v) {
* - `+` plus leftpad if positive (aligns w/ negatives)
* - ` ` space leftpad if positive (aligns w/ negatives)
* - `#` represent value with literal syntax, e.g. 0x, 0b, quotes
* - `^` uppercasing w/ towupper() if linked, otherwise toupper()
*
* Error numbers:
*