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loader: fix elf lookup_symbol type filtering 

The existing logic doesn't seem to make much sense, as we won't filter
on the type if st_shndx != SHN_UNDEF.  In practice, this breaks booting
12.3 kernels on newer loaders, as they do have a `kernphys` symbol of
the wrong type (NOTYPE, rather than OBJECT) -- we end up deriving the
wrong value for copy_staging.

It's unclear if this version makes any more sense, but it seems to match
what rtld's matched_symbol() does.  Loader doesn't need to care about
STT_FUNC w/ UND shndx, because we won't encounter those; in kmods,
undefined (kernel) functions are NOTYPE.

Reported by:	Christian McDonald <cmcdonald netgate com>
Reviewed by:	imp, kib, tsoome
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D36975
This commit is contained in:
Kyle Evans 2022-10-13 22:06:13 -05:00
parent ed7910fbac
commit 0701dbda94
1 changed files with 2 additions and 3 deletions
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5
stand/common/load_elf.c
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@ -1262,9 +1262,8 @@ __elfN(lookup_symbol)(elf_file_t ef, const char* name, Elf_Sym *symp,
strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
if (strcmp(name, strp) == 0) {
free(strp);
if (sym.st_shndx != SHN_UNDEF ||
(sym.st_value != 0 &&
ELF_ST_TYPE(sym.st_info) == type)) {
if (sym.st_shndx != SHN_UNDEF && sym.st_value != 0 &&
ELF_ST_TYPE(sym.st_info) == type) {
*symp = sym;
return 0;
}