From c88d07488c7d9cfdb755d460c63ca80aba323465 Mon Sep 17 00:00:00 2001 From: Gregor Haas Date: Fri, 28 Jun 2024 11:27:06 -0700 Subject: [PATCH] hw/core/loader: allow loading larger ROMs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The read() syscall is not guaranteed to return all data from a file. The default ROM loader implementation currently does not take this into account, instead failing if all bytes are not read at once. This change loads the ROM using g_file_get_contents() instead, which correctly reads all data using multiple calls to read() while also returning the loaded ROM size. Signed-off-by: Gregor Haas Reviewed-by: Xingtao Yao Reviewed-by: Daniel P. Berrangé Reviewed-by: Philippe Mathieu-Daudé Message-ID: <20240628182706.99525-1-gregorhaas1997@gmail.com> [PMD: Use gsize with g_file_get_contents()] Signed-off-by: Philippe Mathieu-Daudé --- hw/core/loader.c | 32 +++++++------------------------- 1 file changed, 7 insertions(+), 25 deletions(-) diff --git a/hw/core/loader.c b/hw/core/loader.c index a3bea1e718..39bd8f9e4d 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -1076,8 +1076,8 @@ ssize_t rom_add_file(const char *file, const char *fw_dir, { MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine()); Rom *rom; - ssize_t rc; - int fd = -1; + gsize size; + g_autoptr(GError) gerr = NULL; char devpath[100]; if (as && mr) { @@ -1095,10 +1095,10 @@ ssize_t rom_add_file(const char *file, const char *fw_dir, rom->path = g_strdup(file); } - fd = open(rom->path, O_RDONLY | O_BINARY); - if (fd == -1) { - fprintf(stderr, "Could not open option rom '%s': %s\n", - rom->path, strerror(errno)); + if (!g_file_get_contents(rom->path, (gchar **) &rom->data, + &size, &gerr)) { + fprintf(stderr, "rom: file %-20s: error %s\n", + rom->name, gerr->message); goto err; } @@ -1107,23 +1107,8 @@ ssize_t rom_add_file(const char *file, const char *fw_dir, rom->fw_file = g_strdup(file); } rom->addr = addr; - rom->romsize = lseek(fd, 0, SEEK_END); - if (rom->romsize == -1) { - fprintf(stderr, "rom: file %-20s: get size error: %s\n", - rom->name, strerror(errno)); - goto err; - } - + rom->romsize = size; rom->datasize = rom->romsize; - rom->data = g_malloc0(rom->datasize); - lseek(fd, 0, SEEK_SET); - rc = read(fd, rom->data, rom->datasize); - if (rc != rom->datasize) { - fprintf(stderr, "rom: file %-20s: read error: rc=%zd (expected %zd)\n", - rom->name, rc, rom->datasize); - goto err; - } - close(fd); rom_insert(rom); if (rom->fw_file && fw_cfg) { const char *basename; @@ -1160,9 +1145,6 @@ ssize_t rom_add_file(const char *file, const char *fw_dir, return 0; err: - if (fd != -1) - close(fd); - rom_free(rom); return -1; }