@@ -155,8 +155,17 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
break;
case R_ARM_PREL31:
- offset = *(u32 *)loc + sym->st_value - loc;
- *(u32 *)loc = offset & 0x7fffffff;
+ offset = (*(s32 *)loc << 1) >> 1; /* sign extend */
+ offset += sym->st_value - loc;
+ if (offset >= 0x40000000 || offset < -0x40000000) {
+ pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
+ module->name, relindex, i, symname,
+ ELF32_R_TYPE(rel->r_info), loc,
+ sym->st_value);
+ return -ENOEXEC;
+ }
+ *(u32 *)loc &= 0x80000000;
+ *(u32 *)loc |= offset & 0x7fffffff;
break;
case R_ARM_MOVW_ABS_NC:
According to the spec 'ELF for the ARM Architecture' (IHI 0044E), addends for R_ARM_PREL31 relocations are 31-bit signed quantities, so we need to sign extend the value to 32 bits before it can be used as an offset in the calculation of the relocated value. We have not been bitten by this because these relocations are usually emitted against the start of a section, which means the addends never assume negative values in practice. But it is a bug nonetheless, so fix it. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- v2: preserve bit 31 of the relocation target arch/arm/kernel/module.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel