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fix regression in dl_iterate_phdr reporting of modules with no TLS

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__tls_get_addr should not be called with an invalid TLS module id of
0. in practice it probably "works", returning the DTV length as if it
were a pointer, and the callback should probably not inspect
dlpi_tls_data in this case, but it's likely that some real-world
callbacks use a check on dlpi_tls_data being non-null, rather than on
dlpi_tls_modid being nonzero, to conclude that the module has TLS.
This commit is contained in:
Rich Felker 2021-04-16 10:20:46 -04:00
parent 0ea78a6421
commit aad50fcd79
1 changed files with 2 additions and 1 deletions
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3
ldso/dynlink.c
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@ -2331,7 +2331,8 @@ int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void
info.dlpi_adds = gencnt;
info.dlpi_subs = 0;
info.dlpi_tls_modid = current->tls_id;
info.dlpi_tls_data = __tls_get_addr((tls_mod_off_t[]){current->tls_id,0});
info.dlpi_tls_data = !current->tls_id ? 0 :
__tls_get_addr((tls_mod_off_t[]){current->tls_id,0});
ret = (callback)(&info, sizeof (info), data);