From patchwork Tue Aug 20 09:57:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Martin X-Patchwork-Id: 171786 Delivered-To: patch@linaro.org Received: by 2002:a92:d204:0:0:0:0:0 with SMTP id y4csp4178261ily; Tue, 20 Aug 2019 02:58:33 -0700 (PDT) X-Google-Smtp-Source: APXvYqyUNqhfhhUAaRUFWYaQH52SVHIU/Gj5U7dXnvrkacYCe8cERQboutq+i6iqgXxSYw3yT5AR X-Received: by 2002:a63:5f01:: with SMTP id t1mr21893983pgb.200.1566295113184; Tue, 20 Aug 2019 02:58:33 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1566295113; cv=none; d=google.com; s=arc-20160816; b=re0xkBSYotG8VXfnsj1g5UD2Txet5yIVMuVjkVE8a0oEYOSC7CT4Wxrc9YRm7smEKJ bZos7W6KKMtUClq6a9EsBGbYyblwIf2u/S5m3cdg7ieG97SMGto5KWzclkB44qIGT3yt 1DCmxdGjcS1h6KML1Nq41s+N2VR2vkWRkoMBCFnQrl4R1Wmi42cQ7yqZENrJF9AUs/gY hMX7PIBsXDZOPVDOVVmoiepzGzZ+XorLtKKgpHqYG7DMjrZLU/fCBj6JTCInpjtv0Sjj sYRRniVfUzS67W3aBLKnJbht24qerTT4CwDYe+42qmyFw5kTbg4xhxFpoCCKhz9mHx76 cwAA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from; bh=7rG7SbnDWDmiwpsZdiGShKrCJZ147ptd4jwxU9J1xWk=; b=Z2rn7Oa0fn/Sdu73N5riY+CAQwjDxeiDNX4PFGt64wwOtnleE1auEO2mRONqojX/G2 YUhEiUXxu6GKD8WsI4MMFkqldIqkFzxigOsdDFOSMbMbTcFn/Hxwu4PNDftuqyt+gu34 C0igar0C5agEMLIeSRxeuOSWNfh7GidpCSJjCrhF7Om1d1eNUsUg17scgFMRuTkQzDn0 iN9j6zyp4a7yH259LuG9nGFe/peXKb3bcrJaLq/+jvgeItprtsxSrvzm6YeDL9+BoRT7 py7rgpnDJ+W+iN5KttcnIwowOy3Mmx2GC3DUXn8MMaDzUaa7+2WronQm6HJSuyVMBACV T20Q== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id i18si12655467pfa.23.2019.08.20.02.58.32; Tue, 20 Aug 2019 02:58:33 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729704AbfHTJ6c (ORCPT + 28 others); Tue, 20 Aug 2019 05:58:32 -0400 Received: from foss.arm.com ([217.140.110.172]:37860 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728414AbfHTJ6b (ORCPT ); Tue, 20 Aug 2019 05:58:31 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0617D344; Tue, 20 Aug 2019 02:58:31 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id A6A903F706; Tue, 20 Aug 2019 02:58:29 -0700 (PDT) From: Dave Martin To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, Kees Cook , Thomas Gleixner , Jann Horn , "H.J. Lu" , Eugene Syromiatnikov , Florian Weimer , Yu-cheng Yu , Peter Zijlstra Subject: [RFC PATCH 1/2] ELF: UAPI and Kconfig additions for ELF program properties Date: Tue, 20 Aug 2019 10:57:42 +0100 Message-Id: <1566295063-7387-2-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1566295063-7387-1-git-send-email-Dave.Martin@arm.com> References: <1566295063-7387-1-git-send-email-Dave.Martin@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pull the basic ELF definitions from Yu-Cheng Yu's series. Signed-off-by: Yu-cheng Yu Signed-off-by: Dave Martin --- This patch should be merged with the next patch. I kept it seprate for now to document where this code came from. --- fs/Kconfig.binfmt | 3 +++ include/uapi/linux/elf.h | 7 +++++++ 2 files changed, 10 insertions(+) -- 2.1.4 diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt index 62dc4f5..d2cfe07 100644 --- a/fs/Kconfig.binfmt +++ b/fs/Kconfig.binfmt @@ -36,6 +36,9 @@ config COMPAT_BINFMT_ELF config ARCH_BINFMT_ELF_STATE bool +config ARCH_USE_GNU_PROPERTY + bool + config BINFMT_ELF_FDPIC bool "Kernel support for FDPIC ELF binaries" default y if !BINFMT_ELF diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index 34c02e4..a3eaad9 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -36,6 +36,7 @@ typedef __s64 Elf64_Sxword; #define PT_LOPROC 0x70000000 #define PT_HIPROC 0x7fffffff #define PT_GNU_EH_FRAME 0x6474e550 +#define PT_GNU_PROPERTY 0x6474e553 #define PT_GNU_STACK (PT_LOOS + 0x474e551) @@ -443,4 +444,10 @@ typedef struct elf64_note { Elf64_Word n_type; /* Content type */ } Elf64_Nhdr; +/* NT_GNU_PROPERTY_TYPE_0 header */ +struct gnu_property { + __u32 pr_type; + __u32 pr_datasz; +}; + #endif /* _UAPI_LINUX_ELF_H */ From patchwork Tue Aug 20 09:57:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Martin X-Patchwork-Id: 171787 Delivered-To: patch@linaro.org Received: by 2002:a92:d204:0:0:0:0:0 with SMTP id y4csp4178298ily; Tue, 20 Aug 2019 02:58:36 -0700 (PDT) X-Google-Smtp-Source: APXvYqz3gtP5Qr/KGwa6T/gBSDV0te4pkzLZwg8z4KyCe3AmZg1niWK0KFZjwmAbuDUVo9QRFy5d X-Received: by 2002:a17:90a:5207:: with SMTP id v7mr24350027pjh.127.1566295116289; Tue, 20 Aug 2019 02:58:36 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1566295116; cv=none; d=google.com; s=arc-20160816; b=BhcXk8tZEvZLYAkNWGkdVOQSAy0MdgeLnh2W8hOPuE0fjxHsmVpsIxGVwIohlnpR4m 18L8TyBwVGQXLXUZ6tNQsM1UgNcI1bDuBF8BO6p6b9TQk9A09raq+9ByXzrZt7Atmscy xbtdmD3YH4GEa2LouD4TyB65V01caMgyP1SE8kBBy4vaTOErrgPENnQlqfc8E0S42V2O mEoIY2vk9vDZ+CSO2YW9OuJTObW63E8mdrTDNRYNGlIie8ehjJMAlfin2tYoJOUw5XIj y6Rt1TU5t1kuaz/okCq55paDSqADdRV1sgXUQJXCkDUk0NuWEJGR0c/EiG9JhIihDsbd BwoA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from; bh=KwEbiC37YgfK0qOvl3DL8cEdH1ge58Iy1tUQszosWOs=; b=QbjvsXXYfq+bhAmaIHl+wwVcjAX9HyEG5JEGIFLAC/HCgiAg8N5GDZRuUEiR74zjzE srhdo3wJO6Arw/DAQhTfTeKFFbBuGd2Ta+cL9MeodbQE0zEuZcNAr5A7mY8gYIbCpyv+ 33jTKxiVga5vlp49t1RyOqcDu7NykEWO8yPpSBHjXwcWSY7wf7imEpXUNA4F5KWpFgQq nxVPH4SjLx3wv6H4DGcmqAwcg4gzFPtPrxMLN/7+ZPUKgKHT+uTqnnIkVz2kM45FQBo5 qJC3J3EQlhAJksJh6BimK7T1JxEwXCrpZ2VxDpHsba57fxvn9uN8URPvCMN32nFIgdho CNjA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id i18si12655467pfa.23.2019.08.20.02.58.36; Tue, 20 Aug 2019 02:58:36 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729725AbfHTJ6e (ORCPT + 28 others); Tue, 20 Aug 2019 05:58:34 -0400 Received: from foss.arm.com ([217.140.110.172]:37876 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729705AbfHTJ6d (ORCPT ); Tue, 20 Aug 2019 05:58:33 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7507C360; Tue, 20 Aug 2019 02:58:32 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3C4AD3F706; Tue, 20 Aug 2019 02:58:31 -0700 (PDT) From: Dave Martin To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, Kees Cook , Thomas Gleixner , Jann Horn , "H.J. Lu" , Eugene Syromiatnikov , Florian Weimer , Yu-cheng Yu , Peter Zijlstra Subject: [RFC PATCH 2/2] ELF: Add ELF program property parsing support Date: Tue, 20 Aug 2019 10:57:43 +0100 Message-Id: <1566295063-7387-3-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1566295063-7387-1-git-send-email-Dave.Martin@arm.com> References: <1566295063-7387-1-git-send-email-Dave.Martin@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ELF program properties will needed for detecting whether to enable optional architecture or ABI features for a new ELF process. For now, there are no generic properties that we care about, so do nothing unless CONFIG_ARCH_USE_GNU_PROPERTY=y. Otherwise, the presence of properties using the PT_PROGRAM_PROPERTY phdrs entry (if any), and notify each property to the arch code. For now, the added code is not used. Signed-off-by: Dave Martin --- fs/binfmt_elf.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++ fs/compat_binfmt_elf.c | 4 ++ include/linux/elf.h | 21 +++++++++ include/uapi/linux/elf.h | 4 ++ 4 files changed, 138 insertions(+) -- 2.1.4 diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index d4e11b2..52f4b96 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -39,12 +39,18 @@ #include #include #include +#include +#include #include #include #include #include #include +#ifndef ELF_COMPAT +#define ELF_COMPAT 0 +#endif + #ifndef user_long_t #define user_long_t long #endif @@ -690,6 +696,93 @@ static unsigned long randomize_stack_top(unsigned long stack_top) #endif } +static int parse_elf_property(const void **prop, size_t *notesz, + struct arch_elf_state *arch) +{ + const struct gnu_property *pr = *prop; + size_t sz = *notesz; + int ret; + size_t step; + + BUG_ON(sz < sizeof(*pr)); + + if (sizeof(*pr) > sz) + return -EIO; + + if (pr->pr_datasz > sz - sizeof(*pr)) + return -EIO; + + step = round_up(sizeof(*pr) + pr->pr_datasz, elf_gnu_property_align); + if (step > sz) + return -EIO; + + ret = arch_parse_elf_property(pr->pr_type, *prop + sizeof(*pr), + pr->pr_datasz, ELF_COMPAT, arch); + if (ret) + return ret; + + *prop += step; + *notesz -= step; + return 0; +} + +#define NOTE_DATA_SZ SZ_1K +#define GNU_PROPERTY_TYPE_0_NAME "GNU" +#define NOTE_NAME_SZ (sizeof(GNU_PROPERTY_TYPE_0_NAME)) + +static int parse_elf_properties(struct file *f, const struct elf_phdr *phdr, + struct arch_elf_state *arch) +{ + ssize_t n; + loff_t pos = phdr->p_offset; + union { + struct elf_note nhdr; + char data[NOTE_DATA_SZ]; + } note; + size_t off, notesz; + const void *prop; + int ret; + + if (!IS_ENABLED(ARCH_USE_GNU_PROPERTY)) + return 0; + + BUG_ON(phdr->p_type != PT_GNU_PROPERTY); + + /* If the properties are crazy large, that's too bad (for now): */ + if (phdr->p_filesz > sizeof(note)) + return -ENOEXEC; + n = kernel_read(f, ¬e, phdr->p_filesz, &pos); + + BUILD_BUG_ON(sizeof(note) < sizeof(note.nhdr) + NOTE_NAME_SZ); + if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ) + return -EIO; + + if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 || + note.nhdr.n_namesz != NOTE_NAME_SZ || + strncmp(note.data + sizeof(note.nhdr), + GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr))) + return -EIO; + + off = round_up(sizeof(note.nhdr) + NOTE_NAME_SZ, + elf_gnu_property_align); + if (off > n) + return -EIO; + + prop = (const struct gnu_property *)(note.data + off); + notesz = n - off; + if (note.nhdr.n_descsz > notesz) + return -EIO; + + while (notesz) { + BUG_ON(((char *)prop - note.data) % elf_gnu_property_align); + ret = parse_elf_property(&prop, ¬esz, arch); + if (ret) + return ret; + } + + return 0; +} + static int load_elf_binary(struct linux_binprm *bprm) { struct file *interpreter = NULL; /* to shut gcc up */ @@ -697,6 +790,7 @@ static int load_elf_binary(struct linux_binprm *bprm) int load_addr_set = 0; unsigned long error; struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; + struct elf_phdr *elf_property_phdata = NULL; unsigned long elf_bss, elf_brk; int bss_prot = 0; int retval, i; @@ -744,6 +838,11 @@ static int load_elf_binary(struct linux_binprm *bprm) char *elf_interpreter; loff_t pos; + if (elf_ppnt->p_type == PT_GNU_PROPERTY) { + elf_property_phdata = elf_ppnt; + continue; + } + if (elf_ppnt->p_type != PT_INTERP) continue; @@ -839,9 +938,14 @@ out_free_interp: goto out_free_dentry; /* Pass PT_LOPROC..PT_HIPROC headers to arch code */ + elf_property_phdata = NULL; elf_ppnt = interp_elf_phdata; for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++) switch (elf_ppnt->p_type) { + case PT_GNU_PROPERTY: + elf_property_phdata = elf_ppnt; + break; + case PT_LOPROC ... PT_HIPROC: retval = arch_elf_pt_proc(&loc->interp_elf_ex, elf_ppnt, interpreter, @@ -852,6 +956,11 @@ out_free_interp: } } + retval = parse_elf_properties(interpreter ?: bprm->file, + elf_property_phdata, &arch_state); + if (retval) + goto out_free_dentry; + /* * Allow arch code to reject the ELF at this point, whilst it's * still possible to return an error to the code that invoked diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c index b7f9ffa..f9ee476 100644 --- a/fs/compat_binfmt_elf.c +++ b/fs/compat_binfmt_elf.c @@ -17,6 +17,8 @@ #include #include +#define ELF_COMPAT 1 + /* * Rename the basic ELF layout types to refer to the 32-bit class of files. */ @@ -28,11 +30,13 @@ #undef elf_shdr #undef elf_note #undef elf_addr_t +#undef elf_gnu_property_align #define elfhdr elf32_hdr #define elf_phdr elf32_phdr #define elf_shdr elf32_shdr #define elf_note elf32_note #define elf_addr_t Elf32_Addr +#define elf_gnu_property_align elf32_gnu_property_align /* * Some data types as stored in coredump. diff --git a/include/linux/elf.h b/include/linux/elf.h index e3649b3..886ffec 100644 --- a/include/linux/elf.h +++ b/include/linux/elf.h @@ -2,6 +2,7 @@ #ifndef _LINUX_ELF_H #define _LINUX_ELF_H +#include #include #include @@ -21,6 +22,9 @@ SET_PERSONALITY(ex) #endif +#define elf32_gnu_property_align 4 +#define elf64_gnu_property_align 8 + #if ELF_CLASS == ELFCLASS32 extern Elf32_Dyn _DYNAMIC []; @@ -31,6 +35,7 @@ extern Elf32_Dyn _DYNAMIC []; #define elf_addr_t Elf32_Off #define Elf_Half Elf32_Half #define Elf_Word Elf32_Word +#define elf_gnu_property_align elf32_gnu_property_align #else @@ -42,6 +47,7 @@ extern Elf64_Dyn _DYNAMIC []; #define elf_addr_t Elf64_Off #define Elf_Half Elf64_Half #define Elf_Word Elf64_Word +#define elf_gnu_property_align elf64_gnu_property_align #endif @@ -56,4 +62,19 @@ static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { extern int elf_coredump_extra_notes_size(void); extern int elf_coredump_extra_notes_write(struct coredump_params *cprm); #endif + +struct arch_elf_state; + +#ifndef CONFIG_ARCH_USE_GNU_PROPERTY +static inline int arch_parse_elf_property(u32 type, const void *data, + size_t datasz, bool compat, + struct arch_elf_state *arch) +{ + return 0; +} +#else +extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz, + bool compat, struct arch_elf_state *arch); +#endif + #endif /* _LINUX_ELF_H */ diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index a3eaad9..f03e3cf 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -368,6 +368,7 @@ typedef struct elf64_shdr { * Notes used in ET_CORE. Architectures export some of the arch register sets * using the corresponding note types via the PTRACE_GETREGSET and * PTRACE_SETREGSET requests. + * The note name for all these is "LINUX". */ #define NT_PRSTATUS 1 #define NT_PRFPREG 2 @@ -430,6 +431,9 @@ typedef struct elf64_shdr { #define NT_MIPS_FP_MODE 0x801 /* MIPS floating-point mode */ #define NT_MIPS_MSA 0x802 /* MIPS SIMD registers */ +/* Note types with note name "GNU" */ +#define NT_GNU_PROPERTY_TYPE_0 5 + /* Note header in a PT_NOTE section */ typedef struct elf32_note { Elf32_Word n_namesz; /* Name size */