https://llvm.org/bugs/show_bug.cgi?id=27790
Bug ID: 27790
Summary: sanitizer dlopen interception clobbers RUNPATH
Product: compiler-rt
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
dlopen() uses the RUNPATH of the dso which calls it. This means that when a
shared sanitizer dso intercepts dlopen, the RUNPATH of the sanitizer dso will
be used instead of the RUNPATH of the dso being intercepted.
Repro steps:
clang-3.8 test.c -Wl,-rpath,'$ORIGIN' -Wl,--enable-new-dtags -ldl -o clean
clang-3.8 test.c -Wl,-rpath,'$ORIGIN' -Wl,--enable-new-dtags -ldl
-fsanitize=address -o sanitized_static
clang-3.8 test.c -Wl,-rpath,'$ORIGIN' -Wl,--enable-new-dtags -ldl
-fsanitize=address -shared-libasan -o sanitized_dynamic
clang-3.8 foo.c -shared -o foo.so
Note that executing clean and sanitized_static will succeed, while executing
sanitized_dynamic will fail.
foo.c:
int foo = 0;
test.c:
#include <dlfcn.h>
int main() {
if (dlopen("foo.so", RTLD_NOW)) {
return 0;
}
return 1;
}
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