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rtld: make token substitution table-driven

Browse Source 
Reviewed by:	emaste, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D34247
This commit is contained in:
Konstantin Belousov 2022-02-11 15:44:36 +02:00
parent ea9a92d210
commit 55abf23dd3
1 changed files with 20 additions and 7 deletions
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27
libexec/rtld-elf/rtld.c
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@ -1175,10 +1175,22 @@ origin_subst_one(Obj_Entry *obj, char *real, const char *kw,
return (res);
}
static const struct {
const char *kw;
bool pass_obj;
const char *subst;
} tokens[] = {
{ .kw = "$ORIGIN", .pass_obj = true, .subst = NULL },
{ .kw = "$OSNAME", .pass_obj = false, .subst = uts.sysname },
{ .kw = "$OSREL", .pass_obj = false, .subst = uts.release },
{ .kw = "$PLATFORM", .pass_obj = false, .subst = uts.machine },
};
static char *
origin_subst(Obj_Entry *obj, const char *real)
{
char *res1, *res2, *res3, *res4;
char *res;
int i;
if (obj == NULL || !trust)
return (xstrdup(real));
@ -1188,13 +1200,14 @@ origin_subst(Obj_Entry *obj, const char *real)
return (NULL);
}
}
/* __DECONST is safe here since without may_free real is unchanged */
res1 = origin_subst_one(obj, __DECONST(char *, real), "$ORIGIN", NULL,
false);
res2 = origin_subst_one(NULL, res1, "$OSNAME", uts.sysname, true);
res3 = origin_subst_one(NULL, res2, "$OSREL", uts.release, true);
res4 = origin_subst_one(NULL, res3, "$PLATFORM", uts.machine, true);
return (res4);
res = __DECONST(char *, real);
for (i = 0; i < (int)nitems(tokens); i++) {
res = origin_subst_one(tokens[i].pass_obj ? obj : NULL,
res, tokens[i].kw, tokens[i].subst, i == 0);
}
return (res);
}
void