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Date: Sun, 5 Nov 2017 02:16:22 -0800 From: tip-bot for Josh Poimboeuf <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org, peterz@...radead.org, hpa@...or.com, tglx@...utronix.de, jpoimboe@...hat.com, mingo@...nel.org Subject: [tip:x86/urgent] x86/module: Detect and skip invalid relocations Commit-ID: eda9cec4c9a12208a6f69fbe68f72a6311d50032 Gitweb: https://git.kernel.org/tip/eda9cec4c9a12208a6f69fbe68f72a6311d50032 Author: Josh Poimboeuf <jpoimboe@...hat.com> AuthorDate: Fri, 3 Nov 2017 07:58:54 -0500 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Sun, 5 Nov 2017 09:52:16 +0100 x86/module: Detect and skip invalid relocations There have been some cases where external tooling (e.g., kpatch-build) creates a corrupt relocation which targets the wrong address. This is a silent failure which can corrupt memory in unexpected places. On x86, the bytes of data being overwritten by relocations are always initialized to zero beforehand. Use that knowledge to add sanity checks to detect such cases before they corrupt memory. Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: jeyu@...nel.org Cc: live-patching@...r.kernel.org Link: http://lkml.kernel.org/r/37450d6c6225e54db107fba447ce9e56e5f758e9.1509713553.git.jpoimboe@redhat.com [ Restructured the messages, as it's unclear whether the relocation or the target is corrupted. ] Signed-off-by: Ingo Molnar <mingo@...nel.org> --- arch/x86/kernel/module.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c index 62e7d70..da0c160 100644 --- a/arch/x86/kernel/module.c +++ b/arch/x86/kernel/module.c @@ -172,19 +172,27 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, case R_X86_64_NONE: break; case R_X86_64_64: + if (*(u64 *)loc != 0) + goto invalid_relocation; *(u64 *)loc = val; break; case R_X86_64_32: + if (*(u32 *)loc != 0) + goto invalid_relocation; *(u32 *)loc = val; if (val != *(u32 *)loc) goto overflow; break; case R_X86_64_32S: + if (*(s32 *)loc != 0) + goto invalid_relocation; *(s32 *)loc = val; if ((s64)val != *(s32 *)loc) goto overflow; break; case R_X86_64_PC32: + if (*(u32 *)loc != 0) + goto invalid_relocation; val -= (u64)loc; *(u32 *)loc = val; #if 0 @@ -200,6 +208,11 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, } return 0; +invalid_relocation: + pr_err("x86/modules: Skipping invalid relocation target, existing value is nonzero for type %d, loc %p, val %Lx\n", + (int)ELF64_R_TYPE(rel[i].r_info), loc, val); + return -ENOEXEC; + overflow: pr_err("overflow in relocation type %d val %Lx\n", (int)ELF64_R_TYPE(rel[i].r_info), val);
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