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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.

(cherry picked from commit 72739c79f61989a76b7dd719f34fcfb7b8eadde9)
This commit is contained in:
Szabolcs Nagy 2020-11-20 15:27:06 +00:00
parent 4c619b3eed
commit 610e2c5150
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;
}
/* Enable BTI for L if required. */
/* Enable BTI for L and its dependencies. */
void
_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);
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);
}
}