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aarch64: Fix missing BTI protection from dependencies [BZ #26926]

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The _dl_open_check and _rtld_main_check hooks are not called on the
dependencies of a loaded module, so BTI protection was missed on
every module other than the main executable and directly dlopened
libraries.

The fix just iterates over dependencies to enable BTI.

Fixes bug 26926.
This commit is contained in:
Szabolcs Nagy 2020-11-20 15:27:06 +00:00
parent 6f19927b98
commit 72739c79f6
1 changed files with 15 additions and 2 deletions
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17
sysdeps/aarch64/dl-bti.c
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@ -51,11 +51,24 @@ enable_bti (struct link_map *map, const char *program)
return 0; return 0;
} }
/* Enable BTI for L if required. */ /* Enable BTI for L and its dependencies. */
void void
_dl_bti_check (struct link_map *l, const char *program) _dl_bti_check (struct link_map *l, const char *program)
{ {
if (GLRO(dl_aarch64_cpu_features).bti && l->l_mach.bti) if (!GLRO(dl_aarch64_cpu_features).bti)
return;
if (l->l_mach.bti)
enable_bti (l, program); enable_bti (l, program);
unsigned int i = l->l_searchlist.r_nlist;
while (i-- > 0)
{
struct link_map *dep = l->l_initfini[i];
if (dep->l_init_called)
continue;
if (dep->l_mach.bti)
enable_bti (dep, program);
}
} }