Commit 70bac08d authored Jun 07, 2019 by Matthias Schiffer Committed by Jessica Yu Jun 24, 2019

ARM: module: recognize unwind exit sections



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>

parent 38b37d63

arch/arm/kernel/module.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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)

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