mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-06-30 08:18:30 +00:00
Prevent Make from talking to public Internet
This change introduces the nointernet() function which may be called to prevent a process and its descendants from communicating with publicly routable Internet addresses. GNU Make has been modified to always call this function. In the future Landlock Make will have a way to whitelist subnets to override this behavior, or disable it entirely. Support is available for Linux only. Our firewall does not require root access. Calling nointernet() will return control to the caller inside a new process that has a SECCOMP BPF filter installed, which traps network related system calls. Your original process then becomes a permanent ptrace() supervisor that monitors all processes and threads descending from the returned child. Whenever a networking system call happens the kernel will stop the process and wakes up the monitor, which then peeks into the child memory to read the sockaddr_in to determine if it's ok. The downside to doing this is that there can be only one supervisor at a time using ptrace() on a process. So this firewall won't be enabled if you run make under strace or inside gdb. It also makes testing tricky.
This commit is contained in:
Justine Tunney
parent
8a0a2c0c36
commit
7cf66bc161
48 changed files with 4924 additions and 2046 deletions
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@ -21,9 +21,11 @@
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#include "libc/str/str.h"
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#include "tool/build/lib/cvt.h"
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#include "tool/build/lib/endian.h"
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#include "tool/build/lib/fpu.h"
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#include "tool/build/lib/machine.h"
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#include "tool/build/lib/memory.h"
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#include "tool/build/lib/modrm.h"
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#include "tool/build/lib/pun.h"
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#include "tool/build/lib/throw.h"
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#define kOpCvt0f2a 0
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@ -34,7 +36,7 @@
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#define kOpCvt0fE6 20
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static double SseRoundDouble(struct Machine *m, double x) {
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switch (m->sse.rc) {
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switch ((m->mxcsr & kMxcsrRc) >> 13) {
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case 0:
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return rint(x);
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case 1:
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@ -44,252 +46,318 @@ static double SseRoundDouble(struct Machine *m, double x) {
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case 3:
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return trunc(x);
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default:
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unreachable;
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for (;;) (void)0;
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}
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}
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static void OpGdqpWssCvttss2si(struct Machine *m, uint32_t rde) {
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float f;
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int64_t n;
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memcpy(&f, GetModrmRegisterXmmPointerRead4(m, rde), 4);
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n = f;
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union FloatPun f;
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f.i = Read32(GetModrmRegisterXmmPointerRead4(m, rde));
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n = f.f;
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if (!Rexw(rde)) n &= 0xffffffff;
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Write64(RegRexrReg(m, rde), n);
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}
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static void OpGdqpWsdCvttsd2si(struct Machine *m, uint32_t rde) {
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double d;
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int64_t n;
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memcpy(&d, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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n = d;
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union DoublePun d;
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d.i = Read64(GetModrmRegisterXmmPointerRead8(m, rde));
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n = d.f;
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if (!Rexw(rde)) n &= 0xffffffff;
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Write64(RegRexrReg(m, rde), n);
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}
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static void OpGdqpWssCvtss2si(struct Machine *m, uint32_t rde) {
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float f;
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int64_t n;
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memcpy(&f, GetModrmRegisterXmmPointerRead4(m, rde), 4);
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n = rintf(f);
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union FloatPun f;
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f.i = Read32(GetModrmRegisterXmmPointerRead4(m, rde));
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n = rintf(f.f);
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if (!Rexw(rde)) n &= 0xffffffff;
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Write64(RegRexrReg(m, rde), n);
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}
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static void OpGdqpWsdCvtsd2si(struct Machine *m, uint32_t rde) {
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double d;
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int64_t n;
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memcpy(&d, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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n = SseRoundDouble(m, d);
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union DoublePun d;
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d.i = Read64(GetModrmRegisterXmmPointerRead8(m, rde));
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n = SseRoundDouble(m, d.f);
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if (!Rexw(rde)) n &= 0xffffffff;
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Write64(RegRexrReg(m, rde), n);
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}
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static void OpVssEdqpCvtsi2ss(struct Machine *m, uint32_t rde) {
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float f;
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int64_t n;
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uint8_t *p;
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union FloatPun f;
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if (Rexw(rde)) {
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n = (int64_t)Read64(GetModrmRegisterWordPointerRead8(m, rde));
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int64_t n;
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n = Read64(GetModrmRegisterWordPointerRead8(m, rde));
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f.f = n;
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Write32(XmmRexrReg(m, rde), f.i);
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} else {
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n = (int32_t)Read32(GetModrmRegisterWordPointerRead4(m, rde));
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int32_t n;
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n = Read32(GetModrmRegisterWordPointerRead4(m, rde));
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f.f = n;
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Write32(XmmRexrReg(m, rde), f.i);
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}
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f = n;
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memcpy(XmmRexrReg(m, rde), &f, 4);
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}
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static void OpVsdEdqpCvtsi2sd(struct Machine *m, uint32_t rde) {
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double d;
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int64_t n;
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uint8_t *p;
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union DoublePun d;
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if (Rexw(rde)) {
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n = (int64_t)Read64(GetModrmRegisterWordPointerRead8(m, rde));
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int64_t n;
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n = Read64(GetModrmRegisterWordPointerRead8(m, rde));
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d.f = n;
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Write64(XmmRexrReg(m, rde), d.i);
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} else {
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n = (int32_t)Read32(GetModrmRegisterWordPointerRead4(m, rde));
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int32_t n;
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n = Read32(GetModrmRegisterWordPointerRead4(m, rde));
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d.f = n;
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Write64(XmmRexrReg(m, rde), d.i);
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}
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d = n;
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memcpy(XmmRexrReg(m, rde), &d, 8);
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}
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static void OpVpsQpiCvtpi2ps(struct Machine *m, uint32_t rde) {
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uint8_t *p;
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float f[2];
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int32_t i[2];
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union FloatPun f[2];
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p = GetModrmRegisterMmPointerRead8(m, rde);
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i[0] = Read32(p + 0);
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i[1] = Read32(p + 4);
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f[0] = i[0];
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f[1] = i[1];
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memcpy(XmmRexrReg(m, rde), f, 8);
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f[0].f = i[0];
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f[1].f = i[1];
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Write32(XmmRexrReg(m, rde) + 0, f[0].i);
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Write32(XmmRexrReg(m, rde) + 4, f[1].i);
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}
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static void OpVpdQpiCvtpi2pd(struct Machine *m, uint32_t rde) {
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uint8_t *p;
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double f[2];
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int32_t n[2];
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union DoublePun f[2];
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p = GetModrmRegisterMmPointerRead8(m, rde);
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n[0] = Read32(p + 0);
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n[1] = Read32(p + 4);
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f[0] = n[0];
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f[1] = n[1];
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memcpy(XmmRexrReg(m, rde), f, 16);
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f[0].f = n[0];
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f[1].f = n[1];
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Write64(XmmRexrReg(m, rde) + 0, f[0].i);
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Write64(XmmRexrReg(m, rde) + 8, f[1].i);
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}
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static void OpPpiWpsqCvtps2pi(struct Machine *m, uint32_t rde) {
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uint8_t *p;
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unsigned i;
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float f[2];
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int32_t n[2];
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memcpy(f, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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switch (m->sse.rc) {
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union FloatPun f[2];
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p = GetModrmRegisterXmmPointerRead8(m, rde);
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f[0].i = Read32(p + 0 * 4);
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f[1].i = Read32(p + 1 * 4);
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switch ((m->mxcsr & kMxcsrRc) >> 13) {
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case 0:
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for (i = 0; i < 2; ++i) n[i] = rintf(f[i]);
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for (i = 0; i < 2; ++i) n[i] = rintf(f[i].f);
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break;
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case 1:
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for (i = 0; i < 2; ++i) n[i] = floorf(f[i]);
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for (i = 0; i < 2; ++i) n[i] = floorf(f[i].f);
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break;
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case 2:
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for (i = 0; i < 2; ++i) n[i] = ceilf(f[i]);
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for (i = 0; i < 2; ++i) n[i] = ceilf(f[i].f);
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break;
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case 3:
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for (i = 0; i < 2; ++i) n[i] = truncf(f[i]);
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for (i = 0; i < 2; ++i) n[i] = truncf(f[i].f);
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break;
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default:
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unreachable;
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for (;;) (void)0;
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}
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Write32(MmReg(m, rde) + 0, n[0]);
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Write32(MmReg(m, rde) + 4, n[1]);
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}
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static void OpPpiWpsqCvttps2pi(struct Machine *m, uint32_t rde) {
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float f[2];
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uint8_t *p;
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int32_t n[2];
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memcpy(&f, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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n[0] = f[0];
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n[1] = f[1];
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union FloatPun f[2];
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p = GetModrmRegisterXmmPointerRead8(m, rde);
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f[0].i = Read32(p + 0);
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f[1].i = Read32(p + 4);
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n[0] = f[0].f;
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n[1] = f[1].f;
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Write32(MmReg(m, rde) + 0, n[0]);
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Write32(MmReg(m, rde) + 4, n[1]);
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}
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static void OpPpiWpdCvtpd2pi(struct Machine *m, uint32_t rde) {
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uint8_t *p;
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unsigned i;
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double d[2];
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int32_t n[2];
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memcpy(d, GetModrmRegisterXmmPointerRead16(m, rde), 16);
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for (i = 0; i < 2; ++i) n[i] = SseRoundDouble(m, d[i]);
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union DoublePun d[2];
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p = GetModrmRegisterXmmPointerRead16(m, rde);
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d[0].i = Read64(p + 0);
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d[1].i = Read64(p + 8);
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for (i = 0; i < 2; ++i) n[i] = SseRoundDouble(m, d[i].f);
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Write32(MmReg(m, rde) + 0, n[0]);
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Write32(MmReg(m, rde) + 4, n[1]);
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}
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static void OpPpiWpdCvttpd2pi(struct Machine *m, uint32_t rde) {
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double d[2];
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uint8_t *p;
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int32_t n[2];
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memcpy(&d, GetModrmRegisterXmmPointerRead16(m, rde), 16);
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n[0] = d[0];
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n[1] = d[1];
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union DoublePun d[2];
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p = GetModrmRegisterXmmPointerRead16(m, rde);
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d[0].i = Read64(p + 0);
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d[1].i = Read64(p + 8);
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n[0] = d[0].f;
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n[1] = d[1].f;
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Write32(MmReg(m, rde) + 0, n[0]);
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Write32(MmReg(m, rde) + 4, n[1]);
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}
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static void OpVpdWpsCvtps2pd(struct Machine *m, uint32_t rde) {
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float f[2];
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double d[2];
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memcpy(f, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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d[0] = f[0];
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d[1] = f[1];
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memcpy(XmmRexrReg(m, rde), d, 16);
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uint8_t *p;
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union FloatPun f[2];
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union DoublePun d[2];
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p = GetModrmRegisterXmmPointerRead8(m, rde);
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f[0].i = Read32(p + 0);
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f[1].i = Read32(p + 4);
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d[0].f = f[0].f;
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d[1].f = f[1].f;
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Write64(XmmRexrReg(m, rde) + 0, d[0].i);
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Write64(XmmRexrReg(m, rde) + 8, d[1].i);
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}
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static void OpVpsWpdCvtpd2ps(struct Machine *m, uint32_t rde) {
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float f[2];
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double d[2];
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memcpy(d, GetModrmRegisterXmmPointerRead16(m, rde), 16);
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f[0] = d[0];
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f[1] = d[1];
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memcpy(XmmRexrReg(m, rde), f, 8);
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uint8_t *p;
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union FloatPun f[2];
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union DoublePun d[2];
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p = GetModrmRegisterXmmPointerRead16(m, rde);
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d[0].i = Read64(p + 0);
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d[1].i = Read64(p + 8);
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f[0].f = d[0].f;
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f[1].f = d[1].f;
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Write32(XmmRexrReg(m, rde) + 0, f[0].i);
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Write32(XmmRexrReg(m, rde) + 4, f[1].i);
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}
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static void OpVssWsdCvtsd2ss(struct Machine *m, uint32_t rde) {
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float f;
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double d;
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memcpy(&d, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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f = d;
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memcpy(XmmRexrReg(m, rde), &f, 4);
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union FloatPun f;
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union DoublePun d;
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d.i = Read64(GetModrmRegisterXmmPointerRead8(m, rde));
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f.f = d.f;
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Write32(XmmRexrReg(m, rde), f.i);
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}
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static void OpVsdWssCvtss2sd(struct Machine *m, uint32_t rde) {
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float f;
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double d;
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memcpy(&f, GetModrmRegisterXmmPointerRead4(m, rde), 4);
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d = f;
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memcpy(XmmRexrReg(m, rde), &d, 8);
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union FloatPun f;
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union DoublePun d;
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f.i = Read32(GetModrmRegisterXmmPointerRead4(m, rde));
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d.f = f.f;
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Write64(XmmRexrReg(m, rde), d.i);
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}
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static void OpVpsWdqCvtdq2ps(struct Machine *m, uint32_t rde) {
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unsigned i;
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float f[4];
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uint8_t *p;
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int32_t n[4];
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memcpy(n, GetModrmRegisterXmmPointerRead16(m, rde), 16);
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for (i = 0; i < 4; ++i) f[i] = n[i];
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memcpy(XmmRexrReg(m, rde), f, 16);
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union FloatPun f[4];
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p = GetModrmRegisterXmmPointerRead16(m, rde);
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n[0] = Read32(p + 0 * 4);
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n[1] = Read32(p + 1 * 4);
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n[2] = Read32(p + 2 * 4);
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n[3] = Read32(p + 3 * 4);
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f[0].f = n[0];
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f[1].f = n[1];
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f[2].f = n[2];
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f[3].f = n[3];
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Write32(XmmRexrReg(m, rde) + 0 * 4, f[0].i);
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Write32(XmmRexrReg(m, rde) + 1 * 4, f[1].i);
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Write32(XmmRexrReg(m, rde) + 2 * 4, f[2].i);
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Write32(XmmRexrReg(m, rde) + 3 * 4, f[3].i);
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}
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static void OpVpdWdqCvtdq2pd(struct Machine *m, uint32_t rde) {
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unsigned i;
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double d[2];
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uint8_t *p;
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int32_t n[2];
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memcpy(n, GetModrmRegisterXmmPointerRead8(m, rde), 8);
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for (i = 0; i < 2; ++i) d[i] = n[i];
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memcpy(XmmRexrReg(m, rde), d, 16);
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union DoublePun d[2];
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p = GetModrmRegisterXmmPointerRead8(m, rde);
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n[0] = Read32(p + 0 * 4);
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n[1] = Read32(p + 1 * 4);
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d[0].f = n[0];
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d[1].f = n[1];
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Write64(XmmRexrReg(m, rde) + 0, d[0].i);
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Write64(XmmRexrReg(m, rde) + 8, d[1].i);
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}
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static void OpVdqWpsCvttps2dq(struct Machine *m, uint32_t rde) {
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unsigned i;
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float f[4];
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uint8_t *p;
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int32_t n[4];
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memcpy(f, GetModrmRegisterXmmPointerRead16(m, rde), 16);
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for (i = 0; i < 4; ++i) n[i] = f[i];
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memcpy(XmmRexrReg(m, rde), n, 16);
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union FloatPun f[4];
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p = GetModrmRegisterXmmPointerRead16(m, rde);
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f[0].i = Read32(p + 0 * 4);
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f[1].i = Read32(p + 1 * 4);
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f[2].i = Read32(p + 2 * 4);
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f[3].i = Read32(p + 3 * 4);
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n[0] = f[0].f;
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n[1] = f[1].f;
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n[2] = f[2].f;
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n[3] = f[3].f;
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Write32(XmmRexrReg(m, rde) + 0 * 4, n[0]);
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Write32(XmmRexrReg(m, rde) + 1 * 4, n[1]);
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Write32(XmmRexrReg(m, rde) + 2 * 4, n[2]);
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Write32(XmmRexrReg(m, rde) + 3 * 4, n[3]);
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}
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static void OpVdqWpsCvtps2dq(struct Machine *m, uint32_t rde) {
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uint8_t *p;
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unsigned i;
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float f[4];
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int32_t n[4];
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memcpy(f, GetModrmRegisterXmmPointerRead16(m, rde), 16);
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switch (m->sse.rc) {
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union FloatPun f[4];
|
||||
p = GetModrmRegisterXmmPointerRead16(m, rde);
|
||||
f[0].i = Read32(p + 0 * 4);
|
||||
f[1].i = Read32(p + 1 * 4);
|
||||
f[2].i = Read32(p + 2 * 4);
|
||||
f[3].i = Read32(p + 3 * 4);
|
||||
switch ((m->mxcsr & kMxcsrRc) >> 13) {
|
||||
case 0:
|
||||
for (i = 0; i < 4; ++i) n[i] = rintf(f[i]);
|
||||
for (i = 0; i < 4; ++i) n[i] = rintf(f[i].f);
|
||||
break;
|
||||
case 1:
|
||||
for (i = 0; i < 4; ++i) n[i] = floorf(f[i]);
|
||||
for (i = 0; i < 4; ++i) n[i] = floorf(f[i].f);
|
||||
break;
|
||||
case 2:
|
||||
for (i = 0; i < 4; ++i) n[i] = ceilf(f[i]);
|
||||
for (i = 0; i < 4; ++i) n[i] = ceilf(f[i].f);
|
||||
break;
|
||||
case 3:
|
||||
for (i = 0; i < 4; ++i) n[i] = truncf(f[i]);
|
||||
for (i = 0; i < 4; ++i) n[i] = truncf(f[i].f);
|
||||
break;
|
||||
default:
|
||||
unreachable;
|
||||
for (;;) (void)0;
|
||||
}
|
||||
memcpy(XmmRexrReg(m, rde), n, 16);
|
||||
Write32(XmmRexrReg(m, rde) + 0 * 4, n[0]);
|
||||
Write32(XmmRexrReg(m, rde) + 1 * 4, n[1]);
|
||||
Write32(XmmRexrReg(m, rde) + 2 * 4, n[2]);
|
||||
Write32(XmmRexrReg(m, rde) + 3 * 4, n[3]);
|
||||
}
|
||||
|
||||
static void OpVdqWpdCvttpd2dq(struct Machine *m, uint32_t rde) {
|
||||
unsigned i;
|
||||
double d[2];
|
||||
uint8_t *p;
|
||||
int32_t n[2];
|
||||
memcpy(d, GetModrmRegisterXmmPointerRead16(m, rde), 16);
|
||||
for (i = 0; i < 2; ++i) n[i] = d[i];
|
||||
memcpy(XmmRexrReg(m, rde), n, 8);
|
||||
union DoublePun d[2];
|
||||
p = GetModrmRegisterXmmPointerRead16(m, rde);
|
||||
d[0].i = Read64(p + 0);
|
||||
d[1].i = Read64(p + 8);
|
||||
n[0] = d[0].f;
|
||||
n[1] = d[1].f;
|
||||
Write32(XmmRexrReg(m, rde) + 0, n[0]);
|
||||
Write32(XmmRexrReg(m, rde) + 4, n[1]);
|
||||
}
|
||||
|
||||
static void OpVdqWpdCvtpd2dq(struct Machine *m, uint32_t rde) {
|
||||
uint8_t *p;
|
||||
unsigned i;
|
||||
double d[2];
|
||||
int32_t n[2];
|
||||
memcpy(d, GetModrmRegisterXmmPointerRead16(m, rde), 16);
|
||||
for (i = 0; i < 2; ++i) n[i] = SseRoundDouble(m, d[i]);
|
||||
memcpy(XmmRexrReg(m, rde), n, 8);
|
||||
union DoublePun d[2];
|
||||
p = GetModrmRegisterXmmPointerRead16(m, rde);
|
||||
d[0].i = Read64(p + 0);
|
||||
d[1].i = Read64(p + 8);
|
||||
for (i = 0; i < 2; ++i) n[i] = SseRoundDouble(m, d[i].f);
|
||||
Write32(XmmRexrReg(m, rde) + 0, n[0]);
|
||||
Write32(XmmRexrReg(m, rde) + 4, n[1]);
|
||||
}
|
||||
|
||||
static void OpCvt(struct Machine *m, uint32_t rde, unsigned long op) {
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue