Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Parse a signed PE binary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #define pr_fmt(fmt) "PEFILE: "fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/pe.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/asn1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/verification.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <crypto/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "verify_pefile.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * Parse a PE binary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static int pefile_parse_binary(const void *pebuf, unsigned int pelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 			       struct pefile_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	const struct mz_hdr *mz = pebuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	const struct pe_hdr *pe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	const struct pe32_opt_hdr *pe32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	const struct pe32plus_opt_hdr *pe64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	const struct data_directory *ddir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	const struct data_dirent *dde;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	const struct section_header *secs, *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	size_t cursor, datalen = pelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	kenter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define chkaddr(base, x, s)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	do {								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		if ((x) < base || (s) >= datalen || (x) > datalen - (s)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			return -ELIBBAD;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	chkaddr(0, 0, sizeof(*mz));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	if (mz->magic != MZ_MAGIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	cursor = sizeof(*mz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	chkaddr(cursor, mz->peaddr, sizeof(*pe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	pe = pebuf + mz->peaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (pe->magic != PE_MAGIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	cursor = mz->peaddr + sizeof(*pe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	chkaddr(0, cursor, sizeof(pe32->magic));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	pe32 = pebuf + cursor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	pe64 = pebuf + cursor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	switch (pe32->magic) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	case PE_OPT_MAGIC_PE32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		chkaddr(0, cursor, sizeof(*pe32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		ctx->image_checksum_offset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			(unsigned long)&pe32->csum - (unsigned long)pebuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		ctx->header_size = pe32->header_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		cursor += sizeof(*pe32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		ctx->n_data_dirents = pe32->data_dirs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	case PE_OPT_MAGIC_PE32PLUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		chkaddr(0, cursor, sizeof(*pe64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		ctx->image_checksum_offset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			(unsigned long)&pe64->csum - (unsigned long)pebuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		ctx->header_size = pe64->header_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		cursor += sizeof(*pe64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		ctx->n_data_dirents = pe64->data_dirs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		pr_debug("Unknown PEOPT magic = %04hx\n", pe32->magic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	pr_debug("checksum @ %x\n", ctx->image_checksum_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	pr_debug("header size = %x\n", ctx->header_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (cursor >= ctx->header_size || ctx->header_size >= datalen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (ctx->n_data_dirents > (ctx->header_size - cursor) / sizeof(*dde))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	ddir = pebuf + cursor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	cursor += sizeof(*dde) * ctx->n_data_dirents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	ctx->cert_dirent_offset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		(unsigned long)&ddir->certs - (unsigned long)pebuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	ctx->certs_size = ddir->certs.size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (!ddir->certs.virtual_address || !ddir->certs.size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		pr_debug("Unsigned PE binary\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		return -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	chkaddr(ctx->header_size, ddir->certs.virtual_address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		ddir->certs.size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	ctx->sig_offset = ddir->certs.virtual_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	ctx->sig_len = ddir->certs.size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	pr_debug("cert = %x @%x [%*ph]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		 ctx->sig_len, ctx->sig_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		 ctx->sig_len, pebuf + ctx->sig_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	ctx->n_sections = pe->sections;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (ctx->n_sections > (ctx->header_size - cursor) / sizeof(*sec))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	ctx->secs = secs = pebuf + cursor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * Check and strip the PE wrapper from around the signature and check that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * remnant looks something like PKCS#7.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static int pefile_strip_sig_wrapper(const void *pebuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 				    struct pefile_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct win_certificate wrapper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	const u8 *pkcs7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	unsigned len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (ctx->sig_len < sizeof(wrapper)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		pr_debug("Signature wrapper too short\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	memcpy(&wrapper, pebuf + ctx->sig_offset, sizeof(wrapper));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	pr_debug("sig wrapper = { %x, %x, %x }\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		 wrapper.length, wrapper.revision, wrapper.cert_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	/* Both pesign and sbsign round up the length of certificate table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	 * (in optional header data directories) to 8 byte alignment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (round_up(wrapper.length, 8) != ctx->sig_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		pr_debug("Signature wrapper len wrong\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (wrapper.revision != WIN_CERT_REVISION_2_0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		pr_debug("Signature is not revision 2.0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		return -ENOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (wrapper.cert_type != WIN_CERT_TYPE_PKCS_SIGNED_DATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		pr_debug("Signature certificate type is not PKCS\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		return -ENOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	/* It looks like the pkcs signature length in wrapper->length and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	 * size obtained from the data dir entries, which lists the total size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	 * of certificate table, are both aligned to an octaword boundary, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	 * we may have to deal with some padding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	ctx->sig_len = wrapper.length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	ctx->sig_offset += sizeof(wrapper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	ctx->sig_len -= sizeof(wrapper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (ctx->sig_len < 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		pr_debug("Signature data missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		return -EKEYREJECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	/* What's left should be a PKCS#7 cert */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	pkcs7 = pebuf + ctx->sig_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (pkcs7[0] != (ASN1_CONS_BIT | ASN1_SEQ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		goto not_pkcs7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	switch (pkcs7[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	case 0 ... 0x7f:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		len = pkcs7[1] + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		goto check_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	case ASN1_INDEFINITE_LENGTH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	case 0x81:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		len = pkcs7[2] + 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		goto check_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	case 0x82:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		len = ((pkcs7[2] << 8) | pkcs7[3]) + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		goto check_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	case 0x83 ... 0xff:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		goto not_pkcs7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) check_len:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (len <= ctx->sig_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		/* There may be padding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		ctx->sig_len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) not_pkcs7:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	pr_debug("Signature data not PKCS#7\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	return -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)  * Compare two sections for canonicalisation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int pefile_compare_shdrs(const void *a, const void *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	const struct section_header *shdra = a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	const struct section_header *shdrb = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (shdra->data_addr > shdrb->data_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (shdrb->data_addr > shdra->data_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (shdra->virtual_address > shdrb->virtual_address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (shdrb->virtual_address > shdra->virtual_address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	rc = strcmp(shdra->name, shdrb->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (rc != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (shdra->virtual_size > shdrb->virtual_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (shdrb->virtual_size > shdra->virtual_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (shdra->raw_data_size > shdrb->raw_data_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (shdrb->raw_data_size > shdra->raw_data_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  * Load the contents of the PE binary into the digest, leaving out the image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  * checksum and the certificate data block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static int pefile_digest_pe_contents(const void *pebuf, unsigned int pelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 				     struct pefile_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 				     struct shash_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	unsigned *canon, tmp, loop, i, hashed_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/* Digest the header and data directory, but leave out the image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	 * checksum and the data dirent for the signature.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	ret = crypto_shash_update(desc, pebuf, ctx->image_checksum_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	tmp = ctx->image_checksum_offset + sizeof(uint32_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	ret = crypto_shash_update(desc, pebuf + tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 				  ctx->cert_dirent_offset - tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	tmp = ctx->cert_dirent_offset + sizeof(struct data_dirent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	ret = crypto_shash_update(desc, pebuf + tmp, ctx->header_size - tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	canon = kcalloc(ctx->n_sections, sizeof(unsigned), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (!canon)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	/* We have to canonicalise the section table, so we perform an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	 * insertion sort.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	canon[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	for (loop = 1; loop < ctx->n_sections; loop++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		for (i = 0; i < loop; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			if (pefile_compare_shdrs(&ctx->secs[canon[i]],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 						 &ctx->secs[loop]) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 				memmove(&canon[i + 1], &canon[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 					(loop - i) * sizeof(canon[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		canon[i] = loop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	hashed_bytes = ctx->header_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	for (loop = 0; loop < ctx->n_sections; loop++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		i = canon[loop];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		if (ctx->secs[i].raw_data_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		ret = crypto_shash_update(desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 					  pebuf + ctx->secs[i].data_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 					  ctx->secs[i].raw_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			kfree(canon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		hashed_bytes += ctx->secs[i].raw_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	kfree(canon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	if (pelen > hashed_bytes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		tmp = hashed_bytes + ctx->certs_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		ret = crypto_shash_update(desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 					  pebuf + hashed_bytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 					  pelen - tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  * Digest the contents of the PE binary, leaving out the image checksum and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)  * certificate data block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) static int pefile_digest_pe(const void *pebuf, unsigned int pelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			    struct pefile_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	struct crypto_shash *tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	struct shash_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	size_t digest_size, desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	void *digest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	kenter(",%s", ctx->digest_algo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	/* Allocate the hashing algorithm we're going to need and find out how
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	 * big the hash operational data will be.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	tfm = crypto_alloc_shash(ctx->digest_algo, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (IS_ERR(tfm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return (PTR_ERR(tfm) == -ENOENT) ? -ENOPKG : PTR_ERR(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	digest_size = crypto_shash_digestsize(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	if (digest_size != ctx->digest_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		pr_debug("Digest size mismatch (%zx != %x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			 digest_size, ctx->digest_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		ret = -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		goto error_no_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	pr_debug("Digest: desc=%zu size=%zu\n", desc_size, digest_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	desc = kzalloc(desc_size + digest_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		goto error_no_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	desc->tfm   = tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	ret = crypto_shash_init(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	ret = pefile_digest_pe_contents(pebuf, pelen, ctx, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	digest = (void *)desc + desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	ret = crypto_shash_final(desc, digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	pr_debug("Digest calc = [%*ph]\n", ctx->digest_len, digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	/* Check that the PE file digest matches that in the MSCODE part of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	 * PKCS#7 certificate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	if (memcmp(digest, ctx->digest, ctx->digest_len) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		pr_debug("Digest mismatch\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		ret = -EKEYREJECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		pr_debug("The digests match!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	kfree_sensitive(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) error_no_desc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	crypto_free_shash(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	kleave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)  * verify_pefile_signature - Verify the signature on a PE binary image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)  * @pebuf: Buffer containing the PE binary image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)  * @pelen: Length of the binary image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)  * @trust_keys: Signing certificate(s) to use as starting points
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)  * @usage: The use to which the key is being put.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)  * Validate that the certificate chain inside the PKCS#7 message inside the PE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)  * binary image intersects keys we already know and trust.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)  * Returns, in order of descending priority:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)  *  (*) -ELIBBAD if the image cannot be parsed, or:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)  *  (*) -EKEYREJECTED if a signature failed to match for which we have a valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)  *	key, or:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)  *  (*) 0 if at least one signature chain intersects with the keys in the trust
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)  *	keyring, or:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)  *  (*) -ENODATA if there is no signature present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)  *  (*) -ENOPKG if a suitable crypto module couldn't be found for a check on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)  *	chain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)  *  (*) -ENOKEY if we couldn't find a match for any of the signature chains in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)  *	the message.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)  * May also return -ENOMEM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) int verify_pefile_signature(const void *pebuf, unsigned pelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 			    struct key *trusted_keys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 			    enum key_being_used_for usage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	struct pefile_context ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	kenter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	memset(&ctx, 0, sizeof(ctx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	ret = pefile_parse_binary(pebuf, pelen, &ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	ret = pefile_strip_sig_wrapper(pebuf, &ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	ret = verify_pkcs7_signature(NULL, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 				     pebuf + ctx.sig_offset, ctx.sig_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 				     trusted_keys, usage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 				     mscode_parse, &ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	pr_debug("Digest: %u [%*ph]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 		 ctx.digest_len, ctx.digest_len, ctx.digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	/* Generate the digest and check against the PKCS7 certificate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	 * contents.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	ret = pefile_digest_pe(pebuf, pelen, &ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	kfree_sensitive(ctx.digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }