https://bugs.llvm.org/show_bug.cgi?id=44500
Bug ID: 44500
Summary: CFI broken with dlsym()
Product: new-bugs
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: hen...@gramner.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
CFI always considers indirect calls to function pointers returned by dlsym() to
have the wrong function signature, even though they're correct, resulting in
SIGILL.
Minimal code sample (compiled with -flto -fvisibility=hidden -fsanitize=cfi
-ldl):
#define _GNU_SOURCE
#include <dlfcn.h>
int main(int arc, char *argv[]) {
int (*p)(const char*) = dlsym(RTLD_DEFAULT, "puts");
if (p) p("hello!");
return 0;
}
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