1 files changed, 39 insertions, 24 deletions

diff --git a/miscutils/ubi_tools.c b/miscutils/ubi_tools.c
index 494718ccf..123551e94 100644
--- a/miscutils/ubi_tools.c
+++ b/miscutils/ubi_tools.c
@@ -52,6 +52,7 @@
 //applet:IF_UBIRMVOL(    APPLET_ODDNAME(ubirmvol,  ubi_tools, BB_DIR_USR_SBIN, BB_SUID_DROP, ubirmvol))
 //applet:IF_UBIRSVOL(    APPLET_ODDNAME(ubirsvol,  ubi_tools, BB_DIR_USR_SBIN, BB_SUID_DROP, ubirsvol))
 //applet:IF_UBIUPDATEVOL(APPLET_ODDNAME(ubiupdatevol, ubi_tools, BB_DIR_USR_SBIN, BB_SUID_DROP, ubiupdatevol))
+/* not NOEXEC: if flash operation stalls, use less memory in "hung" process */
 
 //kbuild:lib-$(CONFIG_UBIATTACH) += ubi_tools.o
 //kbuild:lib-$(CONFIG_UBIDETACH) += ubi_tools.o
@@ -83,16 +84,16 @@
 #define do_rsvol  (ENABLE_UBIRSVOL     && (UBI_APPLET_CNT == 1 || applet_name[4] == 's'))
 #define do_update (ENABLE_UBIUPDATEVOL && (UBI_APPLET_CNT == 1 || applet_name[4] == 'p'))
 
-static unsigned get_num_from_file(const char *path, unsigned max, const char *errmsg)
+static unsigned get_num_from_file(const char *path, unsigned max)
 {
         char buf[sizeof(long long)*3];
         unsigned long long num;
 
         if (open_read_close(path, buf, sizeof(buf)) < 0)
-                bb_perror_msg_and_die(errmsg, path);
+                bb_perror_msg_and_die("can't open '%s'", path);
         /* It can be \n terminated, xatoull won't work well */
         if (sscanf(buf, "%llu", &num) != 1 || num > max)
-                bb_error_msg_and_die(errmsg, path);
+                bb_error_msg_and_die("number in '%s' is malformed or too large", path);
         return num;
 }
 
@@ -226,10 +227,10 @@ int ubi_tools_main(int argc UNUSED_PARAM, char **argv)
                         p = path_sys_class_ubi_ubi + sprintf(path_sys_class_ubi_ubi, "%u/", num);
 
                         strcpy(p, "avail_eraseblocks");
-                        leb_avail = get_num_from_file(path, UINT_MAX, "Can't get available eraseblocks from '%s'");
+                        leb_avail = get_num_from_file(path, UINT_MAX);
 
                         strcpy(p, "eraseblock_size");
-                        leb_size = get_num_from_file(path, MAX_SANE_ERASEBLOCK, "Can't get eraseblock size from '%s'");
+                        leb_size = get_num_from_file(path, MAX_SANE_ERASEBLOCK);
 
                         size_bytes = leb_avail * (unsigned long long)leb_size;
                         //if (size_bytes <= 0)
@@ -241,16 +242,19 @@ int ubi_tools_main(int argc UNUSED_PARAM, char **argv)
                 if (!(opts & OPTION_N))
                         bb_error_msg_and_die("name not specified");
 
+                /* the structure is memset(0) above */
                 mkvol_req.vol_id = vol_id;
                 mkvol_req.vol_type = UBI_DYNAMIC_VOLUME;
                 if ((opts & OPTION_t) && type[0] == 's')
                         mkvol_req.vol_type = UBI_STATIC_VOLUME;
                 mkvol_req.alignment = alignment;
                 mkvol_req.bytes = size_bytes; /* signed int64_t */
-                strncpy(mkvol_req.name, vol_name, UBI_MAX_VOLUME_NAME);
-                mkvol_req.name_len = strlen(vol_name);
+                /* strnlen avoids overflow of 16-bit field (paranoia) */
+                mkvol_req.name_len = strnlen(vol_name, UBI_MAX_VOLUME_NAME+1);
                 if (mkvol_req.name_len > UBI_MAX_VOLUME_NAME)
                         bb_error_msg_and_die("volume name too long: '%s'", vol_name);
+                /* this is safe: .name[] is UBI_MAX_VOLUME_NAME+1 bytes */
+                strcpy(mkvol_req.name, vol_name);
 
                 xioctl(fd, UBI_IOCMKVOL, &mkvol_req);
         } else
@@ -315,38 +319,49 @@ int ubi_tools_main(int argc UNUSED_PARAM, char **argv)
                 else {
                         unsigned ubinum, volnum;
                         unsigned leb_size;
-                        ssize_t len;
-                        char *input_data;
+                        char *buf;
 
                         /* Assume that device is in normal format. */
                         /* Removes need for scanning sysfs tree as full libubi does. */
                         if (sscanf(ubi_ctrl, "/dev/ubi%u_%u", &ubinum, &volnum) != 2)
-                                bb_error_msg_and_die("wrong format of UBI device name");
+                                bb_error_msg_and_die("UBI device name '%s' is not /dev/ubiN_M", ubi_ctrl);
 
                         sprintf(path_sys_class_ubi_ubi, "%u_%u/usable_eb_size", ubinum, volnum);
-                        leb_size = get_num_from_file(path, MAX_SANE_ERASEBLOCK, "Can't get usable eraseblock size from '%s'");
+                        leb_size = get_num_from_file(path, MAX_SANE_ERASEBLOCK);
 
-                        if (!(opts & OPTION_t)) {
-                                if (!*argv)
-                                        bb_show_usage();
+                        if (!*argv)
+                                bb_show_usage();
+                        if (NOT_LONE_DASH(*argv)) /* mtd-utils supports "-" as stdin */
                                 xmove_fd(xopen(*argv, O_RDONLY), STDIN_FILENO);
-                                if (!(opts & OPTION_s)) {
-                                        struct stat st;
-                                        xfstat(STDIN_FILENO, &st, *argv);
-                                        size_bytes = st.st_size;
-                                }
+
+                        if (!(opts & OPTION_s)) {
+                                struct stat st;
+                                xfstat(STDIN_FILENO, &st, *argv);
+                                size_bytes = st.st_size;
                         }
 
                         bytes64 = size_bytes;
                         /* this ioctl expects signed int64_t* parameter */
                         xioctl(fd, UBI_IOCVOLUP, &bytes64);
 
-                        input_data = xmalloc(leb_size);
-                        while ((len = full_read(STDIN_FILENO, input_data, leb_size)) > 0) {
-                                xwrite(fd, input_data, len);
+                        /* can't use bb_copyfd_exact_size(): copy in blocks of exactly leb_size */
+                        buf = xmalloc(leb_size);
+                        while (size_bytes != 0) {
+                                int len = full_read(STDIN_FILENO, buf, leb_size);
+                                if (len <= 0) {
+                                        if (len < 0)
+                                                bb_perror_msg_and_die("read error from '%s'", *argv);
+                                        break;
+                                }
+                                if ((unsigned)len > size_bytes) {
+                                        /* for this case: "ubiupdatevol -s 1024000 $UBIDEV /dev/urandom" */
+                                        len = size_bytes;
+                                }
+                                xwrite(fd, buf, len);
+                                size_bytes -= len;
                         }
-                        if (len < 0)
-                                bb_perror_msg_and_die("UBI volume update failed");
+                        if (ENABLE_FEATURE_CLEAN_UP)
+                                free(buf);
                 }
         }