diff options
| author | Justin Stitt <justinstitt@google.com> | 2023-09-12 22:52:04 +0000 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2023-09-29 14:48:31 -0700 |
| commit | de055e6116742291a31a21a10108d426574988ff (patch) | |
| tree | 1baa45a4044badf9fd0f779c00cffd61efaf5a2a | |
| parent | a952abcdaa22116d940ca9cb9253caad1622ae93 (diff) | |
bus: fsl-mc: Replace deprecated strncpy() with strscpy_pad()
`strncpy` is deprecated for use on NUL-terminated destination strings [1].
We need to prefer more robust and less ambiguous string interfaces.
`obj_desc->(type|label)` are expected to be NUL-terminated strings as
per "include/linux/fsl/mc.h +143"
| ...
| * struct fsl_mc_obj_desc - Object descriptor
| * @type: Type of object: NULL terminated string
| ...
It seems `cmd_params->obj_type` is also expected to be a NUL-terminated string.
A suitable replacement is `strscpy_pad` due to the fact that it
guarantees NUL-termination on the destination buffer whilst keeping the
NUL-padding behavior that `strncpy` provides.
Padding may not strictly be necessary but let's opt to keep it as this
ensures no functional change.
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230912-strncpy-drivers-bus-fsl-mc-dprc-c-v1-1-cdb56aa3f4f4@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | drivers/bus/fsl-mc/dprc.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/bus/fsl-mc/dprc.c b/drivers/bus/fsl-mc/dprc.c index d129338b8bc0..dd1b5c0fb7e2 100644 --- a/drivers/bus/fsl-mc/dprc.c +++ b/drivers/bus/fsl-mc/dprc.c @@ -450,10 +450,8 @@ int dprc_get_obj(struct fsl_mc_io *mc_io, obj_desc->ver_major = le16_to_cpu(rsp_params->version_major); obj_desc->ver_minor = le16_to_cpu(rsp_params->version_minor); obj_desc->flags = le16_to_cpu(rsp_params->flags); - strncpy(obj_desc->type, rsp_params->type, 16); - obj_desc->type[15] = '\0'; - strncpy(obj_desc->label, rsp_params->label, 16); - obj_desc->label[15] = '\0'; + strscpy_pad(obj_desc->type, rsp_params->type, 16); + strscpy_pad(obj_desc->label, rsp_params->label, 16); return 0; } EXPORT_SYMBOL_GPL(dprc_get_obj); @@ -491,8 +489,7 @@ int dprc_set_obj_irq(struct fsl_mc_io *mc_io, cmd_params->irq_addr = cpu_to_le64(irq_cfg->paddr); cmd_params->irq_num = cpu_to_le32(irq_cfg->irq_num); cmd_params->obj_id = cpu_to_le32(obj_id); - strncpy(cmd_params->obj_type, obj_type, 16); - cmd_params->obj_type[15] = '\0'; + strscpy_pad(cmd_params->obj_type, obj_type, 16); /* send command to mc*/ return mc_send_command(mc_io, &cmd); @@ -564,8 +561,7 @@ int dprc_get_obj_region(struct fsl_mc_io *mc_io, cmd_params = (struct dprc_cmd_get_obj_region *)cmd.params; cmd_params->obj_id = cpu_to_le32(obj_id); cmd_params->region_index = region_index; - strncpy(cmd_params->obj_type, obj_type, 16); - cmd_params->obj_type[15] = '\0'; + strscpy_pad(cmd_params->obj_type, obj_type, 16); /* send command to mc*/ err = mc_send_command(mc_io, &cmd); |