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Verified number of MSI sectors

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olszomal 2024-05-31 14:28:38 +02:00 committed by Michał Trojnara
parent 9b1a6c9fb8
commit d0ae214cb4
1 changed files with 17 additions and 0 deletions
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17
msi.c
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@ -996,6 +996,7 @@ static int msi_file_read(MSI_FILE *msi, MSI_ENTRY *entry, uint32_t offset, char
/* Parse MSI_FILE_HDR struct */ /* Parse MSI_FILE_HDR struct */
static MSI_FILE_HDR *parse_header(char *data) static MSI_FILE_HDR *parse_header(char *data)
{ {
uint32_t sectorSize;
MSI_FILE_HDR *header = (MSI_FILE_HDR *)OPENSSL_malloc(HEADER_SIZE); MSI_FILE_HDR *header = (MSI_FILE_HDR *)OPENSSL_malloc(HEADER_SIZE);
/* initialise 512 bytes */ /* initialise 512 bytes */
@ -1038,6 +1039,7 @@ static MSI_FILE_HDR *parse_header(char *data)
OPENSSL_free(header); OPENSSL_free(header);
return NULL; /* FAILED */ return NULL; /* FAILED */
} }
sectorSize = 1 << header->sectorShift;
/* Number of Directory Sectors field contains the count of the number /* Number of Directory Sectors field contains the count of the number
* of directory sectors in the compound file. * of directory sectors in the compound file.
* If Major Version is 3, the Number of Directory Sectors MUST be zero. */ * If Major Version is 3, the Number of Directory Sectors MUST be zero. */
@ -1048,6 +1050,11 @@ static MSI_FILE_HDR *parse_header(char *data)
return NULL; /* FAILED */ return NULL; /* FAILED */
} }
header->numFATSector = GET_UINT32_LE(data + HEADER_FAT_SECTORS_NUM); header->numFATSector = GET_UINT32_LE(data + HEADER_FAT_SECTORS_NUM);
if ((uint64_t)header->numFATSector * sectorSize >= SIZE_16M) {
printf("Unsupported Number of FAT Sectors: 0x%08X\n", header->numFATSector);
OPENSSL_free(header);
return NULL; /* FAILED */
}
header->firstDirectorySectorLocation = GET_UINT32_LE(data + HEADER_DIR_SECTOR_LOC); header->firstDirectorySectorLocation = GET_UINT32_LE(data + HEADER_DIR_SECTOR_LOC);
header->transactionSignatureNumber = GET_UINT32_LE(data + HEADER_TRANSACTION); header->transactionSignatureNumber = GET_UINT32_LE(data + HEADER_TRANSACTION);
/* Mini Stream Cutoff Size field MUST be set to 0x00001000. /* Mini Stream Cutoff Size field MUST be set to 0x00001000.
@ -1063,8 +1070,18 @@ static MSI_FILE_HDR *parse_header(char *data)
} }
header->firstMiniFATSectorLocation = GET_UINT32_LE(data + HEADER_MINI_FAT_SECTOR_LOC); header->firstMiniFATSectorLocation = GET_UINT32_LE(data + HEADER_MINI_FAT_SECTOR_LOC);
header->numMiniFATSector = GET_UINT32_LE(data + HEADER_MINI_FAT_SECTORS_NUM); header->numMiniFATSector = GET_UINT32_LE(data + HEADER_MINI_FAT_SECTORS_NUM);
if ((uint64_t)header->numMiniFATSector * sectorSize >= SIZE_16M) {
printf("Unsupported Number of Mini FAT Sectors: 0x%08X\n", header->numMiniFATSector);
OPENSSL_free(header);
return NULL; /* FAILED */
}
header->firstDIFATSectorLocation = GET_UINT32_LE(data + HEADER_DIFAT_SECTOR_LOC); header->firstDIFATSectorLocation = GET_UINT32_LE(data + HEADER_DIFAT_SECTOR_LOC);
header->numDIFATSector = GET_UINT32_LE(data + HEADER_DIFAT_SECTORS_NUM); header->numDIFATSector = GET_UINT32_LE(data + HEADER_DIFAT_SECTORS_NUM);
if ((uint64_t)header->numDIFATSector * sectorSize >= SIZE_16M) {
printf("Unsupported Number of DIFAT Sectors: 0x%08X\n", header->numDIFATSector);
OPENSSL_free(header);
return NULL; /* FAILED */
}
memcpy(header->headerDIFAT, data + HEADER_DIFAT, sizeof header->headerDIFAT); memcpy(header->headerDIFAT, data + HEADER_DIFAT, sizeof header->headerDIFAT);
return header; return header;
} }