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create-diff-object: error on symbol conversion failure 

If a section reference can't be converted to a symbol reference, error
out to try to prevent unexpected behavior later on.

There are a few sections for which a symbol is optional: .rodata and
string literal sections.  Don't warn about those.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Josh Poimboeuf 2022-05-11 16:35:00 -07:00
parent 325bccd89d
commit 86d5208b46
1 changed files with 14 additions and 6 deletions
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20
kpatch-build/create-diff-object.c
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@ -302,6 +302,12 @@ static bool is_dynamic_debug_symbol(struct symbol *sym)
return false;
}
static bool is_string_literal_section(struct section *sec)
{
return !strncmp(sec->name, ".rodata.", 8) &&
strstr(sec->name, ".str1.");
}
/*
* This function detects whether the given symbol is a "special" static local
* variable (for lack of a better term).
@ -1478,6 +1484,7 @@ static void kpatch_replace_sections_syms(struct kpatch_elf *kelf)
struct rela *rela;
struct symbol *sym;
long target_off;
bool found = false;
log_debug("\n");
@ -1589,11 +1596,18 @@ static void kpatch_replace_sections_syms(struct kpatch_elf *kelf)
relasec->name,
rela->sym->name, rela->addend,
sym->name, rela->addend - start);
found = true;
rela->sym = sym;
rela->addend -= start;
break;
}
if (!found && !is_string_literal_section(rela->sym->sec) &&
strncmp(rela->sym->name, ".rodata", 7)) {
ERROR("%s+0x%x: can't find replacement symbol for %s+%ld reference",
relasec->base->name, rela->offset, rela->sym->name, rela->addend);
}
}
}
log_debug("\n");
@ -1711,12 +1725,6 @@ static void kpatch_include_symbol(struct symbol *sym)
kpatch_include_section(sym->sec);
}
static bool is_string_literal_section(struct section *sec)
{
return !strncmp(sec->name, ".rodata.", 8) &&
strstr(sec->name, ".str1.");
}
static void kpatch_include_standard_elements(struct kpatch_elf *kelf)
{
struct section *sec;