Hi
I make a Image for arm64 (without CONFIG_RANDOMIZE_BASE). And a ko (13M)
can not be inserted.
WARNING: CPU: 2 PID: 1998 at arch/arm64/kernel/module-plts.c:39
module_emit_plt_entry+0x100/0x118
..
Call trace:
module_emit_plt_entry+0x100/0x118
apply_relocate_add+0x34c/0x570
..
I think the problem is that:
in apply_relocate_add:
case R_AARCH64_CALL26:
ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 2, 26,
AARCH64_INSN_IMM_26);
if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
ovf == -ERANGE) {
val = module_emit_plt_entry(me, sechdrs,
loc, &rel[i], sym); realoc_insn_imm return -ERANGE (because the ko is
too big?)
in module_emit_plt_entry:
WARN_ON(pltsec->plt_num_entries > pltsec->plt_max_entries)
pltsec->plt_max_entries is 0 if CONFIG_RANDOMIZE_BASE is not be set.
a257e02 arm64/kernel: don't ban ADRP to work around Cortex-A53 erratum
#843419
static unsigned int count_plts(Elf64_Sym *syms, Elf64_Rela *rela, int
num,
- Elf64_Word dstidx)
+ Elf64_Word dstidx, Elf_Shdr *dstsec)
{
..
switch (ELF64_R_TYPE(rela[i].r_info)) {
case R_AARCH64_JUMP26:
case R_AARCH64_CALL26:
+ if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE))
+ break;
+
Why we need break if !IS_ENABLED(CONFIG_RANDOMIZE_BASE)? or any
restrictions on ko?
I comment out this part of the code. the ko could be inserted, and seems
to work well. So is it a accepted way? or any solution for my case?
--
Regards
Chen Jun
