From: Matthias Schiffer Date: Fri, 7 Jun 2019 10:49:12 +0000 (+0200) Subject: ARM: module: recognize unwind exit sections X-Git-Tag: v5.3-rc1~38^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=70bac08d4157fda334fe21ee38a2e93bc434bac4;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Jessica Yu --- diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index 3ff571c2c71ce..692001aabb0f5 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -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)