Auto merge of rust-lang#3574 - RalfJung:deps, r=RalfJung

reduce test_dependencies

Also add comments for why we need all these 3 random functions for Windows, and the old Linux syscall interface.

Author: bors

src/tools/miri/src/shims/unix/linux/foreign_items.rs

@@ -117,14 +117,24 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                     // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
                     // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
                     id if id == sys_getrandom => {
+                        // Used by getrandom 0.1
                         // The first argument is the syscall id, so skip over it.
                         if args.len() < 4 {
                             throw_ub_format!(
                                 "incorrect number of arguments for `getrandom` syscall: got {}, expected at least 4",
                                 args.len()
                             );
                         }
-                        getrandom(this, &args[1], &args[2], &args[3], dest)?;
+
+                        let ptr = this.read_pointer(&args[1])?;
+                        let len = this.read_target_usize(&args[2])?;
+                        // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
+                        // neither of which have any effect on our current PRNG.
+                        // See <https://github.com/rust-lang/rust/pull/79196> for a discussion of argument sizes.
+                        let _flags = this.read_scalar(&args[3])?.to_i32();
+
+                        this.gen_random(ptr, len)?;
+                        this.write_scalar(Scalar::from_target_usize(len, this), dest)?;
                     }
                     // `futex` is used by some synchronization primitives.
                     id if id == sys_futex => {
@@ -196,24 +206,3 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
         Ok(EmulateItemResult::NeedsJumping)
     }
 }
-
-// Shims the linux `getrandom` syscall.
-fn getrandom<'tcx>(
-    this: &mut MiriInterpCx<'_, 'tcx>,
-    ptr: &OpTy<'tcx, Provenance>,
-    len: &OpTy<'tcx, Provenance>,
-    flags: &OpTy<'tcx, Provenance>,
-    dest: &MPlaceTy<'tcx, Provenance>,
-) -> InterpResult<'tcx> {
-    let ptr = this.read_pointer(ptr)?;
-    let len = this.read_target_usize(len)?;
-
-    // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
-    // neither of which have any effect on our current PRNG.
-    // See <https://github.com/rust-lang/rust/pull/79196> for a discussion of argument sizes.
-    let _flags = this.read_scalar(flags)?.to_i32();
-
-    this.gen_random(ptr, len)?;
-    this.write_scalar(Scalar::from_target_usize(len, this), dest)?;
-    Ok(())
-}

src/tools/miri/src/shims/windows/foreign_items.rs

@@ -513,6 +513,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 throw_machine_stop!(TerminationInfo::Exit { code: code.into(), leak_check: false });
             }
             "SystemFunction036" => {
+                // used by getrandom 0.1
                 // This is really 'RtlGenRandom'.
                 let [ptr, len] =
                     this.check_shim(abi, Abi::System { unwind: false }, link_name, args)?;
@@ -522,6 +523,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 this.write_scalar(Scalar::from_bool(true), dest)?;
             }
             "ProcessPrng" => {
+                // used by `std`
                 let [ptr, len] =
                     this.check_shim(abi, Abi::System { unwind: false }, link_name, args)?;
                 let ptr = this.read_pointer(ptr)?;
@@ -530,6 +532,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 this.write_scalar(Scalar::from_i32(1), dest)?;
             }
             "BCryptGenRandom" => {
+                // used by getrandom 0.2
                 let [algorithm, ptr, len, flags] =
                     this.check_shim(abi, Abi::System { unwind: false }, link_name, args)?;
                 let algorithm = this.read_scalar(algorithm)?;

src/tools/miri/test_dependencies/Cargo.lock

@@ -17,12 +17,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
-[[package]]
-name = "autocfg"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
-
 [[package]]
 name = "backtrace"
 version = "0.3.71"
@@ -50,12 +44,6 @@ version = "3.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
 
-[[package]]
-name = "bytes"
-version = "1.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "514de17de45fdb8dc022b1a7975556c53c86f9f0aa5f534b98977b171857c2c9"
-
 [[package]]
 name = "cc"
 version = "1.0.96"
@@ -141,16 +129,6 @@ version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"
 
-[[package]]
-name = "lock_api"
-version = "0.4.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07af8b9cdd281b7915f413fa73f29ebd5d55d0d3f0155584dade1ff18cea1b17"
-dependencies = [
- "autocfg",
- "scopeguard",
-]
-
 [[package]]
 name = "log"
 version = "0.4.21"
@@ -192,7 +170,6 @@ dependencies = [
  "libc",
  "num_cpus",
  "page_size",
- "rand",
  "tempfile",
  "tokio",
  "windows-sys 0.52.0",
@@ -233,41 +210,12 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "parking_lot"
-version = "0.12.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e4af0ca4f6caed20e900d564c242b8e5d4903fdacf31d3daf527b66fe6f42fb"
-dependencies = [
- "lock_api",
- "parking_lot_core",
-]
-
-[[package]]
-name = "parking_lot_core"
-version = "0.9.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e401f977ab385c9e4e3ab30627d6f26d00e2c73eef317493c4ec6d468726cf8"
-dependencies = [
- "cfg-if",
- "libc",
- "redox_syscall",
- "smallvec",
- "windows-targets 0.52.5",
-]
-
 [[package]]
 name = "pin-project-lite"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
 
-[[package]]
-name = "ppv-lite86"
-version = "0.2.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.81"
@@ -286,45 +234,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rand"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
-dependencies = [
- "libc",
- "rand_chacha",
- "rand_core",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
-dependencies = [
- "ppv-lite86",
- "rand_core",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
-dependencies = [
- "getrandom 0.2.14",
-]
-
-[[package]]
-name = "redox_syscall"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "469052894dcb553421e483e4209ee581a45100d31b4018de03e5a7ad86374a7e"
-dependencies = [
- "bitflags",
-]
-
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
@@ -344,27 +253,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "scopeguard"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
-
-[[package]]
-name = "signal-hook-registry"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9e9e0b4211b72e7b8b6e85c807d36c212bdb33ea8587f7569562a84df5465b1"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "smallvec"
-version = "1.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
-
 [[package]]
 name = "socket2"
 version = "0.5.7"
@@ -405,13 +293,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1adbebffeca75fcfd058afa480fb6c0b81e165a0323f9c9d39c9697e37c46787"
 dependencies = [
  "backtrace",
- "bytes",
  "libc",
  "mio",
  "num_cpus",
- "parking_lot",
  "pin-project-lite",
- "signal-hook-registry",
  "socket2",
  "tokio-macros",
  "windows-sys 0.48.0",

src/tools/miri/test_dependencies/Cargo.toml

@@ -15,11 +15,10 @@ tempfile = "3"
 
 getrandom_01 = { package = "getrandom", version = "0.1" }
 getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }
-rand = { version = "0.8", features = ["small_rng"] }
 
 [target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dependencies]
 page_size = "0.6"
-tokio = { version = "1.24", features = ["full"] }
+tokio = { version = "1.24", features = ["macros", "rt-multi-thread", "time", "net"] }
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.52", features = [ "Win32_Foundation", "Win32_System_Threading" ] }

src/tools/miri/tests/pass-dep/getrandom.rs

@@ -1,8 +1,9 @@
 // mac-os `getrandom_01` does some pointer shenanigans
 //@compile-flags: -Zmiri-permissive-provenance
+//@revisions: isolation no_isolation
+//@[no_isolation]compile-flags: -Zmiri-disable-isolation
 
 /// Test direct calls of getrandom 0.1 and 0.2.
-/// Make sure they work even with isolation enabled (i.e., we do not hit a file-based fallback path).
 fn main() {
     let mut data = vec![0; 16];
     getrandom_01::getrandom(&mut data).unwrap();