Commit 68e6fad4 authored by Russell King's avatar Russell King
Browse files

ARM: improve module relocation fixup diagnostics 



Current diagnostics are rather poor when things go wrong:
  ipv6: relocation out of range, section 2 reloc 0 sym 'snmp_mib_free'

Let's include a little more information about the problem:
  ipv6: section 2 reloc 0 sym 'snmp_mib_free': relocation 28 out of range (0xbf0000a4 -> 0xc11b4858)

so that we show exactly what the problem is - not only what type of
relocation but also the offending address range too.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent a65d2922

arch/arm/kernel/module.c

+14 −13
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, 
	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {

		unsigned long loc;

		Elf32_Sym *sym;

		const char *symname;

		s32 offset;

#ifdef CONFIG_THUMB2_KERNEL

		u32 upper, lower, sign, j1, j2;
@@ -82,18 +83,18 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, 


		offset = ELF32_R_SYM(rel->r_info);

		if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {

			printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",

			pr_err("%s: section %u reloc %u: bad relocation sym offset\n",

				module->name, relindex, i);

			return -ENOEXEC;

		}



		sym = ((Elf32_Sym *)symsec->sh_addr) + offset;

		symname = strtab + sym->st_name;



		if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {

			printk(KERN_ERR "%s: out of bounds relocation, "

				"section %d reloc %d offset %d size %d\n",

				module->name, relindex, i, rel->r_offset,

				dstsec->sh_size);

			pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",

			       module->name, relindex, i, symname,

			       rel->r_offset, dstsec->sh_size);

			return -ENOEXEC;

		}
@@ -119,10 +120,10 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, 
			if (offset & 3 ||

			    offset <= (s32)0xfe000000 ||

			    offset >= (s32)0x02000000) {

				printk(KERN_ERR

				       "%s: relocation out of range, section "

				       "%d reloc %d sym '%s'\n", module->name,

				       relindex, i, strtab + sym->st_name);

				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;

			}
@@ -195,10 +196,10 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, 
			if (!(offset & 1) ||

			    offset <= (s32)0xff000000 ||

			    offset >= (s32)0x01000000) {

				printk(KERN_ERR

				       "%s: relocation out of range, section "

				       "%d reloc %d sym '%s'\n", module->name,

				       relindex, i, strtab + sym->st_name);

				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;

			}

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