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Avoid LD_PRELOAD
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parent
93c4f35615
commit
b51d6ab5cb
@ -1,52 +1,30 @@
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#!/bin/bash
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. $(dirname $0)/common.inc
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# LD_PRELOAD may not work in some environments, so try to test it
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# with the default linker first
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cat <<EOF | $CC -fPIC -shared -o $t/a.so -xc -
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int foo() { return 3; }
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EOF
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cat <<EOF | $CC -fPIC -shared -o $t/b.so -xc -
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int foo() { return 5; }
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EOF
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cat <<EOF | $CC -fPIC -c -o $t/c.o -xc -
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#include <stdio.h>
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int foo();
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int main() { printf("foo=%d\n", foo()); }
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EOF
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$CC -o $t/exe1 -pie $t/c.o $t/a.so
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$QEMU $t/exe1 | grep -q 'foo=3'
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LD_PRELOAD=$t/b.so $QEMU $t/exe1 | grep -q 'foo=5' || skip
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# If LD_PRELOAD works, continue
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cat <<EOF | $CC -B. -fPIC -shared -o $t/d.so -xassembler -
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cat <<EOF | $CC -B. -fPIC -shared -o $t/a.so -xassembler -
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.globl foo
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foo = 3;
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EOF
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cat <<EOF | $CC -B. -fPIC -shared -o $t/e.so -xassembler -
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cat <<EOF | $CC -B. -fPIC -shared -o $t/b.so -xassembler -
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.globl foo
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foo = 5;
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EOF
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cat <<EOF | $CC -fPIC -c -o $t/f.o -xc -
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cat <<EOF | $CC -fPIC -c -o $t/d.o -xc -
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#include <stdio.h>
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extern char foo;
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int main() { printf("foo=%p\n", &foo); }
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EOF
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# This test fails with older glibc
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$CC -B. -o $t/exe2 -pie $t/f.o $t/d.so 2> /dev/null || skip
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$QEMU $t/exe2 | grep -q 'foo=0x3' || skip
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LD_PRELOAD=$t/e.so $QEMU $t/exe2 | grep -q 'foo=0x5'
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cp $t/a.so $t/c.so
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$CC -B. -o $t/exe1 $t/d.o $t/c.so -pie || skip
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$QEMU $t/exe1 | grep -q 'foo=0x3'
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cp $t/b.so $t/c.so
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$QEMU $t/exe1 | grep -q 'foo=0x5'
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$CC -B. -o $t/exe3 -pie $t/f.o $t/d.so
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$QEMU $t/exe3 | grep -q 'foo=0x3'
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LD_PRELOAD=$t/e.so $QEMU $t/exe3 | grep -q 'foo=0x5'
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$CC -B. -o $t/exe4 -no-pie $t/f.o $t/d.so
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$QEMU $t/exe4 | grep -q 'foo=0x3'
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LD_PRELOAD=$t/e.so $QEMU $t/exe4 | grep -q 'foo=0x5'
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cp $t/a.so $t/c.so
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$CC -B. -o $t/exe2 $t/d.o $t/c.so -no-pie
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$QEMU $t/exe2 | grep -q 'foo=0x3'
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cp $t/b.so $t/c.so
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$QEMU $t/exe1 | grep -q 'foo=0x5'
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