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ARM: module: recognize unwind exit sections

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In addition to the prefix ".exit", ".ARM.extab.exit" and ".ARM.exidx.exit"
must be recognized as exit sections as well. Otherwise, loading modules can
fail without CONFIG_MODULE_UNLOAD depending on the memory layout, when
relocations for the unwind sections refer to the .exit.text section:

  imx_sdma: section 16 reloc 0 sym '': relocation 42 out of range
  (0x7f015260 -> 0xc0f5a5e8)

where 0x7F000000 is the module load area and 0xC0000000 is the vmalloc
area. Relocation 42 refers to R_ARM_PREL31, which is limited to signed
31bit offsets.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
This commit is contained in:
Matthias Schiffer 2019-06-07 12:49:12 +02:00 committed by Jessica Yu
parent 38b37d631a
commit 70bac08d41
1 changed files with 7 additions and 0 deletions
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7
arch/arm/kernel/module.c
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@ -58,6 +58,13 @@ void *module_alloc(unsigned long size)
}
#endif
bool module_exit_section(const char *name)
{
return strstarts(name, ".exit") ||
strstarts(name, ".ARM.extab.exit") ||
strstarts(name, ".ARM.exidx.exit");
}
int
apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
unsigned int relindex, struct module *module)