asan.go

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build asan
     6  
     7  package runtime
     8  
     9  import (
    10  	"unsafe"
    11  )
    12  
    13  // Public address sanitizer API.
    14  func ASanRead(addr unsafe.Pointer, len int) {
    15  	sp := getcallersp()
    16  	pc := getcallerpc()
    17  	doasanread(addr, uintptr(len), sp, pc)
    18  }
    19  
    20  func ASanWrite(addr unsafe.Pointer, len int) {
    21  	sp := getcallersp()
    22  	pc := getcallerpc()
    23  	doasanwrite(addr, uintptr(len), sp, pc)
    24  }
    25  
    26  // Private interface for the runtime.
    27  const asanenabled = true
    28  
    29  // asan{read,write} are nosplit because they may be called between
    30  // fork and exec, when the stack must not grow. See issue #50391.
    31  
    32  //go:nosplit
    33  func asanread(addr unsafe.Pointer, sz uintptr) {
    34  	sp := getcallersp()
    35  	pc := getcallerpc()
    36  	doasanread(addr, sz, sp, pc)
    37  }
    38  
    39  //go:nosplit
    40  func asanwrite(addr unsafe.Pointer, sz uintptr) {
    41  	sp := getcallersp()
    42  	pc := getcallerpc()
    43  	doasanwrite(addr, sz, sp, pc)
    44  }
    45  
    46  //go:noescape
    47  func doasanread(addr unsafe.Pointer, sz, sp, pc uintptr)
    48  
    49  //go:noescape
    50  func doasanwrite(addr unsafe.Pointer, sz, sp, pc uintptr)
    51  
    52  //go:noescape
    53  func asanunpoison(addr unsafe.Pointer, sz uintptr)
    54  
    55  //go:noescape
    56  func asanpoison(addr unsafe.Pointer, sz uintptr)
    57  
    58  // These are called from asan_GOARCH.s
    59  //go:cgo_import_static __asan_read_go
    60  //go:cgo_import_static __asan_write_go
    61  //go:cgo_import_static __asan_unpoison_go
    62  //go:cgo_import_static __asan_poison_go
    63
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