Merge bfedbf8dab into f845fa04a0

Closes #21815.

lib/std/crypto/keccak_p.zig

@@ -4,6 +4,7 @@ const assert = std.debug.assert;
 const math = std.math;
 const mem = std.mem;
 const native_endian = builtin.cpu.arch.endian();
+const mode = @import("builtin").mode;
 
 /// The Keccak-f permutation.
 pub fn KeccakF(comptime f: u11) type {
@@ -199,6 +200,46 @@ pub fn State(comptime f: u11, comptime capacity: u11, comptime rounds: u5) type
     comptime assert(f >= 200 and f <= 1600 and f % 200 == 0); // invalid state size
     comptime assert(capacity < f and capacity % 8 == 0); // invalid capacity size
 
+    // In debug mode, track transitions to prevent insecure ones.
+    const Op = enum { uninitialized, initialized, updated, absorb, squeeze };
+    const TransitionTracker = if (mode == .Debug) struct {
+        op: Op = .uninitialized,
+
+        fn to(tracker: *@This(), next_op: Op) void {
+            switch (next_op) {
+                .updated => {
+                    switch (tracker.op) {
+                        .uninitialized => @panic("cannot permute before initializing"),
+                        else => {},
+                    }
+                },
+                .absorb => {
+                    switch (tracker.op) {
+                        .squeeze => @panic("cannot absorb right after squeezing"),
+                        else => {},
+                    }
+                },
+                .squeeze => {
+                    switch (tracker.op) {
+                        .uninitialized => @panic("cannot squeeze before initializing"),
+                        .initialized => @panic("cannot squeeze right after initializing"),
+                        .absorb => @panic("cannot squeeze right after absorbing"),
+                        else => {},
+                    }
+                },
+                .uninitialized => @panic("cannot transition to uninitialized"),
+                .initialized => {},
+            }
+            tracker.op = next_op;
+        }
+    } else struct {
+        // No-op in non-debug modes.
+        inline fn to(tracker: *@This(), next_op: Op) void {
+            _ = tracker; // no-op
+            _ = next_op; // no-op
+        }
+    };
+
     return struct {
         const Self = @This();
 
@@ -215,67 +256,108 @@ pub fn State(comptime f: u11, comptime capacity: u11, comptime rounds: u5) type
 
         st: KeccakF(f) = .{},
 
+        transition: TransitionTracker = .{},
+
         /// Absorb a slice of bytes into the sponge.
-        pub fn absorb(self: *Self, bytes_: []const u8) void {
-            var bytes = bytes_;
+        pub fn absorb(self: *Self, bytes: []const u8) void {
+            self.transition.to(.absorb);
+            var i: usize = 0;
             if (self.offset > 0) {
                 const left = @min(rate - self.offset, bytes.len);
                 @memcpy(self.buf[self.offset..][0..left], bytes[0..left]);
                 self.offset += left;
+                if (left == bytes.len) return;
                 if (self.offset == rate) {
-                    self.offset = 0;
                     self.st.addBytes(self.buf[0..]);
                     self.st.permuteR(rounds);
+                    self.offset = 0;
                 }
-                if (left == bytes.len) return;
-                bytes = bytes[left..];
+                i = left;
             }
-            while (bytes.len >= rate) {
-                self.st.addBytes(bytes[0..rate]);
+            while (i + rate < bytes.len) : (i += rate) {
+                self.st.addBytes(bytes[i..][0..rate]);
                 self.st.permuteR(rounds);
-                bytes = bytes[rate..];
             }
-            if (bytes.len > 0) {
-                @memcpy(self.buf[0..bytes.len], bytes);
-                self.offset = bytes.len;
+            const left = bytes.len - i;
+            if (left > 0) {
+                @memcpy(self.buf[0..left], bytes[i..][0..left]);
             }
+            self.offset = left;
         }
 
         /// Initialize the state from a slice of bytes.
-        pub fn init(bytes: [f / 8]u8) Self {
-            return .{ .st = KeccakF(f).init(bytes) };
+        pub fn init(bytes: [f / 8]u8, delim: u8) Self {
+            var st = Self{ .st = KeccakF(f).init(bytes), .delim = delim };
+            st.transition.to(.initialized);
+            return st;
         }
 
         /// Permute the state
         pub fn permute(self: *Self) void {
+            if (mode == .Debug) {
+                if (self.transition.op == .absorb and self.offset > 0) {
+                    @panic("cannot permute with pending input - call fillBlock() or pad() instead");
+                }
+            }
+            self.transition.to(.updated);
             self.st.permuteR(rounds);
             self.offset = 0;
         }
 
-        /// Align the input to the rate boundary.
+        /// Align the input to the rate boundary and permute.
         pub fn fillBlock(self: *Self) void {
+            self.transition.to(.absorb);
             self.st.addBytes(self.buf[0..self.offset]);
             self.st.permuteR(rounds);
             self.offset = 0;
+            self.transition.to(.updated);
         }
 
         /// Mark the end of the input.
         pub fn pad(self: *Self) void {
+            self.transition.to(.absorb);
             self.st.addBytes(self.buf[0..self.offset]);
+            if (self.offset == rate) {
+                self.st.permuteR(rounds);
+                self.offset = 0;
+            }
             self.st.addByte(self.delim, self.offset);
             self.st.addByte(0x80, rate - 1);
             self.st.permuteR(rounds);
             self.offset = 0;
+            self.transition.to(.updated);
         }
 
         /// Squeeze a slice of bytes from the sponge.
+        /// The function can be called multiple times.
         pub fn squeeze(self: *Self, out: []u8) void {
+            self.transition.to(.squeeze);
             var i: usize = 0;
-            while (i < out.len) : (i += rate) {
-                const left = @min(rate, out.len - i);
-                self.st.extractBytes(out[i..][0..left]);
+            if (self.offset == rate) {
+                self.st.permuteR(rounds);
+            } else if (self.offset > 0) {
+                @branchHint(.unlikely);
+                var buf: [rate]u8 = undefined;
+                self.st.extractBytes(buf[0..]);
+                const left = @min(rate - self.offset, out.len);
+                @memcpy(out[0..left], buf[self.offset..][0..left]);
+                self.offset += left;
+                if (left == out.len) return;
+                if (self.offset == rate) {
+                    self.offset = 0;
+                    self.st.permuteR(rounds);
+                }
+                i = left;
+            }
+            while (i + rate < out.len) : (i += rate) {
+                self.st.extractBytes(out[i..][0..rate]);
                 self.st.permuteR(rounds);
             }
+            const left = out.len - i;
+            if (left > 0) {
+                self.st.extractBytes(out[i..][0..left]);
+            }
+            self.offset = left;
         }
     };
 }
@@ -298,3 +380,26 @@ test "Keccak-f800" {
     };
     try std.testing.expectEqualSlices(u32, &st.st, &expected);
 }
+
+test "squeeze" {
+    var st = State(800, 256, 22).init([_]u8{0x80} ** 100, 0x01);
+
+    var out0: [15]u8 = undefined;
+    var out1: [out0.len]u8 = undefined;
+    st.permute();
+    var st0 = st;
+    st0.squeeze(out0[0..]);
+    var st1 = st;
+    st1.squeeze(out1[0 .. out1.len / 2]);
+    st1.squeeze(out1[out1.len / 2 ..]);
+    try std.testing.expectEqualSlices(u8, &out0, &out1);
+
+    var out2: [100]u8 = undefined;
+    var out3: [out2.len]u8 = undefined;
+    var st2 = st;
+    st2.squeeze(out2[0..]);
+    var st3 = st;
+    st3.squeeze(out3[0 .. out2.len / 2]);
+    st3.squeeze(out3[out2.len / 2 ..]);
+    try std.testing.expectEqualSlices(u8, &out2, &out3);
+}

lib/std/debug/MemoryAccessor.zig

@@ -48,7 +48,8 @@ fn read(ma: *MemoryAccessor, address: usize, buf: []u8) bool {
                 switch (linux.E.init(bytes_read)) {
                     .SUCCESS => return bytes_read == buf.len,
                     .FAULT => return false,
-                    .INVAL, .PERM, .SRCH => unreachable, // own pid is always valid
+                    .INVAL, .SRCH => unreachable, // own pid is always valid
+                    .PERM => {}, // Known to happen in containers.
                     .NOMEM => {},
                     .NOSYS => {}, // QEMU is known not to implement this syscall.
                     else => unreachable, // unexpected

src/Package/Module.zig

@@ -312,18 +312,29 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
         if (!options.global.use_llvm) break :b null;
 
         var buf = std.ArrayList(u8).init(arena);
-        for (target.cpu.arch.allFeaturesList(), 0..) |feature, index_usize| {
-            const index = @as(std.Target.Cpu.Feature.Set.Index, @intCast(index_usize));
-            const is_enabled = target.cpu.features.isEnabled(index);
+        var disabled_features = std.ArrayList(u8).init(arena);
+        defer disabled_features.deinit();
 
+        // Append disabled features after enabled ones, so that their effects aren't overwritten.
+        for (target.cpu.arch.allFeaturesList()) |feature| {
             if (feature.llvm_name) |llvm_name| {
-                const plus_or_minus = "-+"[@intFromBool(is_enabled)];
-                try buf.ensureUnusedCapacity(2 + llvm_name.len);
-                buf.appendAssumeCapacity(plus_or_minus);
-                buf.appendSliceAssumeCapacity(llvm_name);
-                buf.appendSliceAssumeCapacity(",");
+                const is_enabled = target.cpu.features.isEnabled(feature.index);
+
+                if (is_enabled) {
+                    try buf.ensureUnusedCapacity(2 + llvm_name.len);
+                    buf.appendAssumeCapacity('+');
+                    buf.appendSliceAssumeCapacity(llvm_name);
+                    buf.appendAssumeCapacity(',');
+                } else {
+                    try disabled_features.ensureUnusedCapacity(2 + llvm_name.len);
+                    disabled_features.appendAssumeCapacity('-');
+                    disabled_features.appendSliceAssumeCapacity(llvm_name);
+                    disabled_features.appendAssumeCapacity(',');
+                }
             }
         }
+
+        try buf.appendSlice(disabled_features.items);
         if (buf.items.len == 0) break :b "";
         assert(std.mem.endsWith(u8, buf.items, ","));
         buf.items[buf.items.len - 1] = 0;

src/Sema.zig

@@ -23564,10 +23564,13 @@ fn ptrFromIntVal(
         return sema.fail(block, operand_src, "pointer type '{}' requires aligned address", .{ptr_ty.fmt(pt)});
 
     return switch (ptr_ty.zigTypeTag(zcu)) {
-        .optional => Value.fromInterned(try pt.intern(.{ .opt = .{
-            .ty = ptr_ty.toIntern(),
-            .val = if (addr == 0) .none else (try pt.ptrIntValue(ptr_ty.childType(zcu), addr)).toIntern(),
-        } })),
+        .optional => val: {
+            const is_null: bool = addr == 0 and !ptr_ty.childType(zcu).isAllowzeroPtr(zcu);
+            break :val Value.fromInterned(try pt.intern(.{ .opt = .{
+                .ty = ptr_ty.toIntern(),
+                .val = if (is_null) .none else (try pt.ptrIntValue(ptr_ty.childType(zcu), addr)).toIntern(),
+            } }));
+        },
         .pointer => try pt.ptrIntValue(ptr_ty, addr),
         else => unreachable,
     };

test/behavior/ptrfromint.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const builtin = @import("builtin");
+const expect = std.testing.expect;
 const expectEqual = std.testing.expectEqual;
 
 test "casting integer address to function pointer" {
@@ -35,8 +36,15 @@ test "@ptrFromInt creates null pointer" {
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
-    const ptr = @as(?*u32, @ptrFromInt(0));
-    try expectEqual(@as(?*u32, null), ptr);
+    const S = struct {
+        fn doTest(addr: usize) !void {
+            const ptr: ?*u32 = @ptrFromInt(addr);
+            try expectEqual(null, ptr);
+        }
+    };
+
+    try S.doTest(0);
+    comptime try S.doTest(0);
 }
 
 test "@ptrFromInt creates allowzero zero pointer" {
@@ -44,6 +52,29 @@ test "@ptrFromInt creates allowzero zero pointer" {
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
-    const ptr = @as(*allowzero u32, @ptrFromInt(0));
-    try expectEqual(@as(usize, 0), @intFromPtr(ptr));
+    const S = struct {
+        fn doTest(addr: usize) !void {
+            const ptr: *allowzero const u32 = @ptrFromInt(addr);
+            try expectEqual(addr, @intFromPtr(ptr));
+        }
+    };
+
+    try S.doTest(0);
+    comptime try S.doTest(0);
+}
+
+test "@ptrFromInt creates optional allowzero zero pointer" {
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTest(addr: usize) !void {
+            const ptr: ?*allowzero const u32 = @ptrFromInt(addr);
+            try expect(ptr != null);
+        }
+    };
+
+    try S.doTest(0);
+    comptime try S.doTest(0);
 }