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dlfcn: Failures after dlmopen should not terminate process [BZ #24772]

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Commit 9e78f6f6e7 ("Implement
_dl_catch_error, _dl_signal_error in libc.so [BZ #16628]") has the
side effect that distinct namespaces, as created by dlmopen, now have
separate implementations of the rtld exception mechanism.  This means
that the call to _dl_catch_error from libdl in a secondary namespace
does not actually install an exception handler because the
thread-local variable catch_hook in the libc.so copy in the secondary
namespace is distinct from that of the base namepace.  As a result, a
dlsym/dlopen/... failure in a secondary namespace terminates the process
with a dynamic linker error because it looks to the exception handler
mechanism as if no handler has been installed.

This commit restores GLRO (dl_catch_error) and uses it to set the
handler in the base namespace.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2021-04-21 19:49:51 +02:00
parent 66d99dc53a
commit b2964eb1d9
7 changed files with 110 additions and 4 deletions
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12
elf/dl-error-skeleton.c
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@ -248,4 +248,16 @@ _dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
catch_hook = old_catch;
receiver = old_receiver;
}
/* Forwarder used for initializing GLRO (_dl_catch_error). */
int
_rtld_catch_error (const char **objname, const char **errstring,
bool *mallocedp, void (*operate) (void *),
void *args)
{
/* The reference to _dl_catch_error will eventually be relocated to
point to the implementation in libc.so. */
return _dl_catch_error (objname, errstring, mallocedp, operate, args);
}
#endif /* DL_ERROR_BOOTSTRAP */