On Mon, 2019-06-03 at 12:57 +0200, Matthias Schiffer wrote: > For some time (050d18d1c651 "ARM: 8650/1: module: handle negative > R_ARM_PREL31 addends correctly", v4.11+), building a kernel without > CONFIG_MODULE_UNLOAD would lead to module loads failing on ARM > systems with > certain memory layouts, with messages like: > > imx_sdma: section 16 reloc 0 sym '': relocation 42 out of range > (0x7f015260 -> 0xc0f5a5e8) > > (0x7f015260 is in the module load area, 0xc0f5a5e8 a regular vmalloc > address; relocation 42 is R_ARM_PREL31) > > This is caused by relocatiosn in the .ARM.extab.exit.text and > .ARM.exidx.exit.text sections referencing the .exit.text section. As > the > module loader will omit loading .exit.text without > CONFIG_MODULE_UNLOAD, > there will be relocations from loaded to unloaded sections; the > resulting > huge offsets trigger the sanity checks added in 050d18d1c651. > > IA64 might be affected by a similar issue - sections with names like > .IA_64.unwind.exit.text and .IA_64.unwind_info.exit.text appear in > the ld > script - but I don't know much about that arch. > > Also, I'm not sure if this is stable-worthy - just enabling > CONFIG_MODULE_UNLOAD should be a viable workaround on affected > kernels. > > > Kind regards, > Matthias Hi, any comments on these patches? If not, who is going to take them in their tree? Note that I'll be out of office for the next week, and I won't be able to read my mail during this period. Kind regards, Matthias > > > Matthias Schiffer (2): > module: allow arch overrides for .exit section names > ARM: module: recognize unwind exit sections > > arch/arm/include/asm/module.h | 11 +++++++++++ > include/linux/moduleloader.h | 8 ++++++++ > kernel/module.c | 2 +- > 3 files changed, 20 insertions(+), 1 deletion(-) >
|