mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
5a132f9652
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.
382 lines
17 KiB
C
382 lines
17 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/fmt.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/limits.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/rand/rand.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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#define S(x) ((uintptr_t)(x))
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/**
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* returns random bytes that don't have exclamation mark
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* since that would disable memory safety in the fuzzing
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*/
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static uint64_t Rando(void) {
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uint64_t x;
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do x = lemur64();
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while (((x ^ READ64LE("!!!!!!!!")) - 0x0101010101010101) &
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~(x ^ READ64LE("!!!!!!!!")) & 0x8080808080808080);
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return x;
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}
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static const struct {
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const char *want;
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const char *fmt;
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uintptr_t arg1;
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uintptr_t arg2;
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} V[] = {
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{"!!WONTFMT", (const char *)31337, 123}, //
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{"!!31337", "%s", 0x31337}, //
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{"!!1", "%#s", 1}, //
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{"!!feff800000031337", "%s", 0xfeff800000031337ull}, //
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{"!!ffff800000031337", "%s", 0xffff800000031337ull}, //
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{"123", "%d", 123}, //
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{"2147483647", "%d", INT_MAX}, //
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{"-2147483648", "%d", INT_MIN}, //
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{"9223372036854775807", "%ld", LONG_MAX}, //
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{"-9223372036854775808", "%ld", LONG_MIN}, //
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{"9'223'372'036'854'775'807", "%'ld", LONG_MAX}, //
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{"-9'223'372'036'854'775'808", "%'ld", LONG_MIN}, //
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{"9,223,372,036,854,775,807", "%,ld", LONG_MAX}, //
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{"-9,223,372,036,854,775,808", "%,ld", LONG_MIN}, //
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{"9_223_372_036_854_775_807", "%_ld", LONG_MAX}, //
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{"-9_223_372_036_854_775_808", "%_ld", LONG_MIN}, //
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{"true", "%hhhd", 0xffff}, //
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{"true", "%hhhd", 0xff00}, //
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{"false", "%hhhd"}, //
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{"fa", "%hhh.2d"}, //
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{" 0x001337", "%#010.6x", 0x1337}, //
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{"0x001337 ", "%#-010.6x", 0x1337}, //
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{"0x1337 ", "%#-010.2x", 0x1337}, //
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{" 0x1337", "%#010.2x", 0x1337}, //
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{"0000001337", "%010d", 1337}, //
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{"+000001337", "%+010d", 1337}, //
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{" 001337", "%010.6d", 1337}, //
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{" +001337", "%+010.6d", 1337}, //
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{" 001337", "%010.6x", 0x1337}, //
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{" 1337", "%010.2x", 0x1337}, //
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{"1337 ", "%-010d", 1337}, //
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{"001337 ", "%-010.6d", 1337}, //
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{"+1337 ", "%+-010d", 1337}, //
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{"+001337 ", "%+-010.6d", 1337}, //
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{"001337 ", "%-010.6x", 0x1337}, //
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{"1337 ", "%-010.2x", 0x1337}, //
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{"000001'337", "%'010d", 1337}, //
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{" 1337", "%*d", 10, 1337}, //
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{"1337 ", "%*d", -10, 1337}, //
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{"0", "%#x"}, //
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{"0", "%#o"}, //
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{"0", "%#b"}, //
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{"0", "%#d"}, //
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{"0", "%p"}, //
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{"-1", "%p", S(MAP_FAILED)}, //
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{"00000000", "%#.8x"}, //
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{"00000000", "%#.8b"}, //
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{"00000000", "%#.8o"}, //
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{" 123", "%5d", 123}, //
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{" -123", "%5d", -123}, //
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{" 123", "%*d", 5, 123}, //
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{" -123", "%*d", 5, -123}, //
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{"123 ", "%-5d", 123}, //
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{"-123 ", "%-5d", -123}, //
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{" +123", "%+5d", 123}, //
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{"00123", "%05d", 123}, //
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{"-0123", "%05d", -123}, //
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{" 0", "%5d"}, //
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{" +0", "%+5d"}, //
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{"00000", "%05d"}, //
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{" deadbeef", "%20x", 0xdeadbeef}, //
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{" 0xdeadbeef", "%20p", 0xdeadbeef}, //
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{"101", "%b", 0b101}, //
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{"123", "%x", 0x123}, //
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{"deadbeef", "%x", 0xdeadbeef}, //
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{"DEADBEEF", "%X", 0xdeadbeef}, //
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{"0", "%hd", INT_MIN}, //
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{"123", "%o", 0123}, //
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{"+0", "%+d"}, //
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{"+123", "%+d", 123}, //
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{"-123", "%+d", -123}, //
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{" 0", "% d"}, //
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{" 123", "% d", 123}, //
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{"-123", "% d", -123}, //
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{"x", "%c", 'x'}, //
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{"☺", "%hc", u'☺'}, //
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{"☺", "%lc", L'☺'}, //
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{"☺", "%C", L'☺'}, //
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{"0x31337", "%p", 0x31337}, //
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{"0xffff800000031337", "%p", 0xffff800000031337ull}, //
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{"0xfeff800000031337", "%p", 0xfeff800000031337ull}, //
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{"65535", "%hu", 0xffffffffu}, //
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{"0", "%hu", 0x80000000u}, //
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{"123", "%hd", 123}, //
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{"32767", "%hd", SHRT_MAX}, //
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{"-32768", "%hd", SHRT_MIN}, //
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{"-1", "%hhd", 0xffff}, //
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{"-128", "%hhd", 0xff80}, //
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{"255", "%hhu", 0xffffffffu}, //
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{"'x'", "%#c", 'x'}, //
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{"u'☺'", "%#hc", u'☺'}, //
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{"L'☺'", "%#lc", L'☺'}, //
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{"L'☺'", "%#C", L'☺'}, //
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{"L'\\''", "%#C", L'\''}, //
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{"hello world\n", "%s", S("hello world\n")}, //
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{"☺☻♥♦♣♠!\n", "%s", S("☺☻♥♦♣♠!\n")}, //
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{"␁", "%s", S("\1")}, //
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{"\1", "%.*s", 1, S("\1")}, //
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{"\\001", "%'s", S("\1")}, //
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{"\"\\001\"", "%#s", S("\1")}, //
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{"", "%.*s", 0}, //
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{"☺☻♥♦♣♠!", "%hhs", S("\1\2\3\4\5\6!")}, //
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{"☺☻", "%.*hhs", 2, S("\1\2\3\4\5\6!")}, //
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{"u\"☺☻\"", "%#.*hhs", 2, S("\1\2\3\4\5\6!")}, //
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{"u\" ☻\"", "%#.*hhs", 2, S("\0\2\3\4\5\6!")}, //
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{"", "% s", S("")}, //
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{" a", "% s", S("a")}, //
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{"", "% .*s", 0, S("a")}, //
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{"", "% s"}, //
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{"𐌰𐌱𐌲𐌳𐌴𐌵𐌶𐌷", "%hs", S(u"𐌰𐌱𐌲𐌳𐌴𐌵𐌶𐌷")}, //
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{"☺☻♥♦♣♠!", "%ls", S(L"☺☻♥♦♣♠!")}, //
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{"HELLO", "%^s", S("hello")}, //
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{"eeeeeee ", "%10s", S("eeeeeee")}, //
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{"hello", "%.*s", 5, S("hello world")}, //
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{"þell", "%.*s", 5, S("þello world")}, //
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{"þello", "%.*hs", 5, S(u"þello world")}, //
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{"þeeeeee ", "%10s", S("þeeeeee")}, //
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{"☺☻♥♦♣♠! ", "%10s", S("☺☻♥♦♣♠!")}, //
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{"☺☻♥♦♣♠ ", "%10hs", S(u"☺☻♥♦♣♠")}, //
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{"𐌰𐌱𐌲𐌳𐌴𐌵𐌶𐌷 ", "%10hs", S(u"𐌰𐌱𐌲𐌳𐌴𐌵𐌶𐌷")}, //
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{"☺☻♥♦♣♠! ", "%10ls", S(L"☺☻♥♦♣♠!")}, //
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{"\"xx\"", "%#s", S("xx")}, //
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{"u\"☺☺\"", "%#hs", S(u"☺☺")}, //
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{"L\"☺☺\"", "%#ls", S(L"☺☺")}, //
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{"\"\\\\\\\"\\177\"", "%#s", S("\\\"\177")}, //
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{"%%", "%%%%"}, //
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{"%", "%.%"}, //
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{"=", "%="}, //
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};
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TEST(ksnprintf, test) {
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char b[48], g[48];
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size_t i, j, n, rc;
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rngset(g, sizeof(g), 0, 0);
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for (i = 0; i < ARRAYLEN(V); ++i) {
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bzero(b, 48);
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n = strlen(V[i].want);
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rc = ksnprintf(b, 48, V[i].fmt, V[i].arg1, V[i].arg2);
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EXPECT_EQ(n, rc, "ksnprintf(\"%s\", %#lx, %#lx) → %zu ≠ %zu", V[i].fmt,
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V[i].arg1, V[i].arg2, rc, n);
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EXPECT_STREQ(V[i].want, b);
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memcpy(b, g, 48);
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for (j = 0; j < 40; ++j) {
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rc = ksnprintf(b, 0, V[i].fmt, V[i].arg1, V[i].arg2);
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ASSERT_EQ(n, rc, "ksnprintf(b, %zu, \"%s\", %#lx, %#lx) → %zu ≠ %zu", j,
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V[i].fmt, V[i].arg1, V[i].arg2, rc, n);
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ASSERT_EQ(READ64LE(g + j), READ64LE(b + j),
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"ksnprintf(b, %zu, \"%s\", %#lx, %#lx) → buffer overrun", j,
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V[i].fmt, V[i].arg1, V[i].arg2);
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}
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}
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}
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TEST(ksnprintf, testSymbols) {
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char b[2][32];
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bool hassymbols;
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hassymbols = GetSymbolTable();
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ksnprintf(b[0], 32, "%t", strlen);
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if (hassymbols) {
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ASSERT_STREQ("&strlen", b[0]);
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} else {
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ksnprintf(b[1], 32, "&%x", strlen);
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ASSERT_STREQ(b[1], b[0]);
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}
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}
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TEST(ksnprintf, fuzzTheUnbreakable) {
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int e;
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size_t i;
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uint64_t x;
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char *f, b[32];
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_Alignas(PAGESIZE) static const char weasel[PAGESIZE];
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asm("mov\t%1,%0" : "=r"(f) : "g"(weasel));
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EXPECT_SYS(0, 0, mprotect(f, PAGESIZE, PROT_READ | PROT_WRITE));
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strcpy(f, "hello %s\n");
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EXPECT_EQ(12, ksnprintf(b, sizeof(b), f, "world"));
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EXPECT_STREQ("hello world\n", b);
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for (i = 0; i < 30000; ++i) {
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x = Rando();
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memcpy(f, &x, sizeof(x));
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x = Rando();
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memcpy(f + 8, &x, sizeof(x));
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f[Rando() & 15] = '%';
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ksnprintf(b, sizeof(b), f, lemur64(), lemur64(), lemur64());
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}
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EXPECT_SYS(0, 0, mprotect(f, PAGESIZE, PROT_READ));
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}
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TEST(kprintf, testFailure_wontClobberErrnoAndBypassesSystemCallSupport) {
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int n;
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ASSERT_EQ(0, errno);
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EXPECT_SYS(0, 3, dup(2));
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EXPECT_SYS(0, 0, close(2));
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n = g_syscount;
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kprintf("hello%n");
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EXPECT_EQ(n, g_syscount);
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EXPECT_EQ(0, errno);
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EXPECT_SYS(0, 2, dup2(3, 2));
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EXPECT_SYS(0, 0, close(3));
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}
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TEST(ksnprintf, testy) {
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char b[32];
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EXPECT_EQ(3, ksnprintf(b, 32, "%#s", 1));
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EXPECT_STREQ("!!1", b);
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}
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TEST(ksnprintf, testNonTextFmt_wontFormat) {
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char b[32];
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char variable_format_string[16] = "%s";
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EXPECT_EQ(9, ksnprintf(b, 32, variable_format_string, NULL));
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EXPECT_STREQ("!!WONTFMT", b);
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}
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TEST(ksnprintf, testMisalignedPointer_wontFormat) {
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char b[32];
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const char16_t *s = u"hello";
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ksnprintf(b, 32, "%hs", (char *)s + 1);
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EXPECT_STARTSWITH("!!", b);
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}
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TEST(ksnprintf, testUnterminatedOverrun_truncatesAtPageBoundary) {
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char *m;
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char b[32];
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m = memset(mapanon(FRAMESIZE * 2), 1, FRAMESIZE);
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EXPECT_SYS(0, 0, munmap(m + FRAMESIZE, FRAMESIZE));
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EXPECT_EQ(12, ksnprintf(b, 32, "%'s", m + FRAMESIZE - 3));
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EXPECT_STREQ("\\001\\001\\001", b);
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EXPECT_SYS(0, 0, munmap(m, FRAMESIZE));
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}
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TEST(ksnprintf, testEmptyBuffer_determinesTrueLength) {
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EXPECT_EQ(5, ksnprintf(0, 0, "hello"));
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}
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TEST(ksnprintf, testFormatOnly_copiesString) {
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char b[6];
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EXPECT_EQ(5, ksnprintf(b, 6, "hello"));
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EXPECT_STREQ("hello", b);
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}
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TEST(ksnprintf, testOneChar_justNulTerminates) {
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char b[2] = {1, 2};
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EXPECT_EQ(3, ksnprintf(b, 1, "%d", 123));
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EXPECT_EQ(0, b[0]);
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EXPECT_EQ(2, b[1]);
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}
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TEST(kprintf, testStringUcs2) {
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char b[32];
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EXPECT_EQ(21, ksnprintf(b, 32, "%hs", u"þ☺☻♥♦♣♠!"));
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EXPECT_EQ(0xc3, b[0] & 255);
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EXPECT_EQ(0xbe, b[1] & 255);
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EXPECT_EQ(0xe2, b[2] & 255);
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EXPECT_EQ(0x98, b[3] & 255);
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EXPECT_EQ(0xba, b[4] & 255);
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EXPECT_STREQ("þ☺☻♥♦♣♠!", b);
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}
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TEST(kprintf, testTruncate_addsDotsAndReturnsTrueLength) {
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char b[15];
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EXPECT_EQ(10, ksnprintf(b, 15, "%p", 0xdeadbeef));
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EXPECT_STREQ("0xdeadbeef", b);
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EXPECT_EQ(10, ksnprintf(b, 10, "%p", 0xdeadbeef));
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EXPECT_STREQ("0xdead...", b);
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}
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TEST(kprintf, testTruncate_preservesNewlineFromEndOfFormatString) {
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char b[14];
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EXPECT_EQ(11, ksnprintf(b, 10, "%p\n", 0xdeadbeef));
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EXPECT_STREQ("0xdea...\n", b);
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}
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TEST(ksnprintf, testTruncate_doesntBreakApartCharacters) {
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char b[5];
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ASSERT_EQ(6, ksnprintf(b, 5, "☻☻"));
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ASSERT_STREQ("....", b);
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}
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TEST(ksnprintf, badUtf16) {
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size_t i;
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char b[16];
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static const struct {
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const char *want;
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const char *fmt;
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char16_t arg[16];
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} V[] = {
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{"<EFBFBD> ", "%10hs", {0xd800}},
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{"<EFBFBD> ", "%10hs", {0xdc00}},
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{"<EFBFBD><EFBFBD> ", "%10hs", {0xd800, 0xd800}},
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{"<EFBFBD><EFBFBD> ", "%10hs", {0xdc00, 0xdc00}},
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};
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for (i = 0; i < ARRAYLEN(V); ++i) {
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EXPECT_EQ(strlen(V[i].want), ksnprintf(b, 16, V[i].fmt, V[i].arg));
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EXPECT_STREQ(V[i].want, b);
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}
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}
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BENCH(printf, bench) {
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char b[128];
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int snprintf_(char *, size_t, const char *, ...) asm("snprintf");
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EZBENCH2("ksnprintf fmt", donothing, ksnprintf(b, 128, "."));
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EZBENCH2("kusnprintf fmt", donothing, kusnprintf(b, 128, "."));
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EZBENCH2("snprintf fmt", donothing, snprintf_(b, 128, "."));
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EZBENCH2("kusnprintf str", donothing,
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kusnprintf(b, 128, "%s\n", "hello world"));
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EZBENCH2("snprintf str", donothing,
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snprintf_(b, 128, "%s\n", "hello world"));
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EZBENCH2("kusnprintf utf8", donothing,
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kusnprintf(b, 128, "%s\n", "天地玄黄宇宙洪荒天地玄黄宇宙洪荒"));
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EZBENCH2("snprintf utf8", donothing,
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snprintf_(b, 128, "%s\n", "天地玄黄宇宙洪荒天地玄黄宇宙洪荒"));
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EZBENCH2("kusnprintf chinese", donothing,
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kusnprintf(b, 128, "%hs\n", u"天地玄黄宇宙洪荒"));
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EZBENCH2("snprintf chinese", donothing,
|
||
snprintf_(b, 128, "%hs\n", u"天地玄黄宇宙洪荒"));
|
||
EZBENCH2("kusnprintf astral", donothing,
|
||
kusnprintf(b, 128, "%hs\n", u"𐌰𐌱𐌲𐌳𐌴𐌵𐌶𐌷"));
|
||
EZBENCH2("snprintf astral", donothing,
|
||
snprintf_(b, 128, "%hs\n", u"𐌰𐌱𐌲𐌳𐌴𐌵𐌶𐌷"));
|
||
EZBENCH2("kusnprintf long", donothing, kusnprintf(b, 128, "%ld", LONG_MAX));
|
||
EZBENCH2("snprintf long", donothing, snprintf_(b, 128, "%ld", LONG_MAX));
|
||
EZBENCH2("kusnprintf thou", donothing, kusnprintf(b, 128, "%'ld", LONG_MAX));
|
||
EZBENCH2("snprintf thou", donothing, snprintf_(b, 128, "%'ld", LONG_MAX));
|
||
}
|