glibc/elf/nextmod3.c
Fangrui Song efa7936e4c dlsym: Make RTLD_NEXT prefer default version definition [BZ #14932]
When the first object providing foo defines both foo@v1 and foo@@v2,
dlsym(RTLD_NEXT, "foo") returns foo@v1 while dlsym(RTLD_DEFAULT, "foo")
returns foo@@v2.  The issue is that RTLD_DEFAULT uses the
DL_LOOKUP_RETURN_NEWEST flag while RTLD_NEXT doesn't.  Fix the RTLD_NEXT
branch to use DL_LOOKUP_RETURN_NEWEST.

Note: the new behavior matches FreeBSD rtld.  Future sanitizers will not
need to add versioned interceptors like https://reviews.llvm.org/D96348

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2022-05-27 12:34:49 -07:00

21 lines
199 B
C

int
foo_v1 (int a)
{
return 1;
}
asm (".symver foo_v1, foo@v1");
int
foo_v2 (int a)
{
return 2;
}
asm (".symver foo_v2, foo@v2");
int
foo (int a)
{
return 3;
}
asm (".symver foo, foo@@@v3");