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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/testsuite/go.test/test/nilptr/arraytoslice2.go | |
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Diffstat (limited to 'gcc/testsuite/go.test/test/nilptr/arraytoslice2.go')
-rw-r--r-- | gcc/testsuite/go.test/test/nilptr/arraytoslice2.go | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/testsuite/go.test/test/nilptr/arraytoslice2.go b/gcc/testsuite/go.test/test/nilptr/arraytoslice2.go new file mode 100644 index 000000000..1b2651381 --- /dev/null +++ b/gcc/testsuite/go.test/test/nilptr/arraytoslice2.go @@ -0,0 +1,35 @@ +// [ $GOOS != nacl ] || exit 0 # do not bother on NaCl +// $G $D/$F.go && $L $F.$A && +// ((! sh -c ./$A.out) >/dev/null 2>&1 || echo BUG: should fail) + +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package main + +import "unsafe" + +var dummy [512<<20]byte // give us a big address space +var q *[1<<30]byte +func main() { + // the test only tests what we intend to test + // if dummy starts in the first 256 MB of memory. + // otherwise there might not be anything mapped + // at the address that might be accidentally + // dereferenced below. + if uintptr(unsafe.Pointer(&dummy)) > 256<<20 { + panic("dummy too far out") + } + + // The problem here is that indexing into p[] with a large + // enough index can jump out of the unmapped section + // at the beginning of memory and into valid memory. + // + // To avoid needing a check on every slice beyond the + // usual len and cap, we require the *array -> slice + // conversion to do the check. + var x []byte + var y = &x + *y = q[0:] // should crash (uses arraytoslice runtime routine) +} |