From ebe0f53f48e8f9ecc823e533a85b05c13638c350 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Tue, 6 Dec 2016 17:17:01 +0100 Subject: [PATCH] tools: mkimage: Use fstat instead of stat to avoid malicious hacks The patch is fixing: "tools: mkimage: Check if file is regular file" (sha1: 56c7e8015509312240b1ee15f2ff74510939a45d) which contains two issues reported by Coverity Unchecked return value from stat and incorrect calling sequence where attack can happen between calling stat and fopen. Using pair in opposite order (fopen and fstat) is fixing this issue because fstat is using the same file descriptor (FILE *). Also fixing issue with: "tools: mkimage: Add support for initialization table for Zynq and ZynqMP" (sha1: 3b6460809c2a28360029c1c48247648fac4455c9) where file wasn't checked that it is regular file. Reported-by: Coverity (CID: 154711, 154712) Signed-off-by: Michal Simek Reviewed-by: Tom Rini --- tools/zynqimage.c | 16 +++++++++++++--- tools/zynqmpimage.c | 14 +++++++++----- 2 files changed, 22 insertions(+), 8 deletions(-) diff --git a/tools/zynqimage.c b/tools/zynqimage.c index 43876e7a30..b47132b02a 100644 --- a/tools/zynqimage.c +++ b/tools/zynqimage.c @@ -225,16 +225,26 @@ static int zynqimage_check_image_types(uint8_t type) static void zynqimage_parse_initparams(struct zynq_header *zynqhdr, const char *filename) { - /* Expect a table of register-value pairs, e.g. "0x12345678 0x4321" */ - FILE *fp = fopen(filename, "r"); + FILE *fp; struct zynq_reginit reginit; unsigned int reg_count = 0; - int r; + int r, err; + struct stat path_stat; + /* Expect a table of register-value pairs, e.g. "0x12345678 0x4321" */ + fp = fopen(filename, "r"); if (!fp) { fprintf(stderr, "Cannot open initparams file: %s\n", filename); exit(1); } + + err = fstat(fileno(fp), &path_stat); + if (err) + return; + + if (!S_ISREG(path_stat.st_mode)) + return; + do { r = fscanf(fp, "%x %x", ®init.address, ®init.data); if (r == 2) { diff --git a/tools/zynqmpimage.c b/tools/zynqmpimage.c index 202faea072..60d8ed23b4 100644 --- a/tools/zynqmpimage.c +++ b/tools/zynqmpimage.c @@ -240,19 +240,23 @@ static void zynqmpimage_parse_initparams(struct zynqmp_header *zynqhdr, FILE *fp; struct zynqmp_reginit reginit; unsigned int reg_count = 0; - int r; + int r, err; struct stat path_stat; - stat(filename, &path_stat); - if (!S_ISREG(path_stat.st_mode)) - return; - /* Expect a table of register-value pairs, e.g. "0x12345678 0x4321" */ fp = fopen(filename, "r"); if (!fp) { fprintf(stderr, "Cannot open initparams file: %s\n", filename); exit(1); } + + err = fstat(fileno(fp), &path_stat); + if (err) + return; + + if (!S_ISREG(path_stat.st_mode)) + return; + do { r = fscanf(fp, "%x %x", ®init.address, ®init.data); if (r == 2) { -- 2.30.2