diff options
| author | Laszlo Ersek <lersek@redhat.com> | 2019-01-18 23:31:52 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2019-02-05 10:58:33 -0500 |
| commit | 3b3df3e52dd6adff483d8626c8f0801fd0ac05df (patch) | |
| tree | 3f1c351210b3f8ea7b574f5f22f118c677f10504 | |
| parent | 24cf5413aa059f874c34e442802ce25cd1e72178 (diff) | |
fw_cfg: fix the life cycle and the name of "qemu_extra_params_fw"
Commit 19bcc4bc3213 ("fw_cfg: Make qemu_extra_params_fw locally",
2019-01-04) changed the storage duration of the "qemu_extra_params_fw"
array from static to automatic. This broke the interface contract on the
fw_cfg_add_file() function, which is documented as follows, in
"include/hw/nvram/fw_cfg.h":
> [...] The data referenced by the starting pointer is only linked, NOT
> copied, into the data structure of the fw_cfg device. [...]
As a result, when guest firmware fetches the "etc/boot-menu-wait" fw_cfg
file, it now sees garbage. Fix the regression by changing the storage
duration to allocated. (The call is reached at most once, on the realize
path of the board-specific fw_cfg sysbus device.)
While at it, clean up the name and the assignment of the object as well.
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Fixes: 19bcc4bc3213e78c303ad480a7a578f62258252d
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
| -rw-r--r-- | hw/nvram/fw_cfg.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c index 53e8e010a8..7fdf04adc9 100644 --- a/hw/nvram/fw_cfg.c +++ b/hw/nvram/fw_cfg.c @@ -118,7 +118,6 @@ static void fw_cfg_bootsplash(FWCfgState *s) { const char *boot_splash_filename = NULL; const char *boot_splash_time = NULL; - uint8_t qemu_extra_params_fw[2]; char *filename, *file_data; gsize file_size; int file_type; @@ -132,6 +131,8 @@ static void fw_cfg_bootsplash(FWCfgState *s) /* insert splash time if user configurated */ if (boot_splash_time) { int64_t bst_val = qemu_opt_get_number(opts, "splash-time", -1); + uint16_t bst_le16; + /* validate the input */ if (bst_val < 0 || bst_val > 0xffff) { error_report("splash-time is invalid," @@ -139,9 +140,9 @@ static void fw_cfg_bootsplash(FWCfgState *s) exit(1); } /* use little endian format */ - qemu_extra_params_fw[0] = (uint8_t)(bst_val & 0xff); - qemu_extra_params_fw[1] = (uint8_t)((bst_val >> 8) & 0xff); - fw_cfg_add_file(s, "etc/boot-menu-wait", qemu_extra_params_fw, 2); + bst_le16 = cpu_to_le16(bst_val); + fw_cfg_add_file(s, "etc/boot-menu-wait", + g_memdup(&bst_le16, sizeof bst_le16), sizeof bst_le16); } /* insert splash file if user configurated */ |