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ldso: fix TLSDESC addend processing on archs with backwards descriptors 

presently this only affects 32-bit arm. despite correctly reversing
the function pointer and argument fields based on the
TLSDESC_BACKWARDS macro, we did not read the addend from the
swapped-order argument field, so nonzero addends were lost, producing
wrong runtime addresses for TLS objects needing an addend.

based on report and patch by Rui Ueyama.
This commit is contained in:
Rich Felker 2023-11-06 21:50:37 -05:00
parent 039d3c34f2
commit e17b9d7474
1 changed files with 1 additions and 1 deletions
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2
ldso/dynlink.c
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@ -517,7 +517,7 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
break;
#endif
case REL_TLSDESC:
if (stride<3) addend = reloc_addr[1];
if (stride<3) addend = reloc_addr[!TLSDESC_BACKWARDS];
if (def.dso->tls_id > static_tls_cnt) {
struct td_index *new = malloc(sizeof *new);
if (!new) {