Looking back at the initrd storing functionality, we introduced three functions, efi_dp_append_or_concatenate(), efi_dp_append/concat(). In hindsight we could have simplified that by a lot. First of all none of the functions append anything. They all allocate a new device path and concatenate the contents of two device paths in one. A boolean parameter controls the final device path -- if that's true an end node is injected between the two device paths.
So let's rewrite this and make it a bit easier to read. Get rid of efi_dp_append(), efi_dp_concat() and rename efi_dp_append_or_concatenate() to efi_dp_concat(). This is far more intuitive and the only adjustment that is needed is an extra boolean argument on all callsites. Signed-off-by: Ilias Apalodimas <[email protected]> --- Changes since v1: - move the size calculation in a single if - Clarify the subtype of the device path we are using on the end node - Rebase on top of -next cmd/eficonfig.c | 7 ++- cmd/efidebug.c | 6 +- include/efi_loader.h | 5 +- lib/efi_loader/efi_bootmgr.c | 6 +- lib/efi_loader/efi_boottime.c | 2 +- lib/efi_loader/efi_device_path.c | 70 +++++++--------------- lib/efi_loader/efi_device_path_utilities.c | 2 +- 7 files changed, 35 insertions(+), 63 deletions(-) diff --git a/cmd/eficonfig.c b/cmd/eficonfig.c index 34a59cb15d0d..8234e602b8fb 100644 --- a/cmd/eficonfig.c +++ b/cmd/eficonfig.c @@ -531,7 +531,7 @@ struct efi_device_path *eficonfig_create_device_path(struct efi_device_path *dp_ dp = efi_dp_shorten(dp_volume); if (!dp) dp = dp_volume; - dp = efi_dp_append(dp, &fp->dp); + dp = efi_dp_concat(dp, &fp->dp, false); free(buf); return dp; @@ -1484,7 +1484,8 @@ static efi_status_t eficonfig_edit_boot_option(u16 *varname, struct eficonfig_bo ret = EFI_OUT_OF_RESOURCES; goto out; } - initrd_dp = efi_dp_append((const struct efi_device_path *)&id_dp, dp); + initrd_dp = efi_dp_concat((const struct efi_device_path *)&id_dp, + dp, false); efi_free_pool(dp); } @@ -1495,7 +1496,7 @@ static efi_status_t eficonfig_edit_boot_option(u16 *varname, struct eficonfig_bo } final_dp_size = efi_dp_size(dp) + sizeof(END); if (initrd_dp) { - final_dp = efi_dp_concat(dp, initrd_dp); + final_dp = efi_dp_concat(dp, initrd_dp, true); final_dp_size += efi_dp_size(initrd_dp) + sizeof(END); } else { final_dp = efi_dp_dup(dp); diff --git a/cmd/efidebug.c b/cmd/efidebug.c index e10fbf891a42..836014ab8eab 100644 --- a/cmd/efidebug.c +++ b/cmd/efidebug.c @@ -699,8 +699,8 @@ struct efi_device_path *create_initrd_dp(const char *dev, const char *part, if (!short_fp) short_fp = tmp_fp; - initrd_dp = efi_dp_append((const struct efi_device_path *)&id_dp, - short_fp); + initrd_dp = efi_dp_concat((const struct efi_device_path *)&id_dp, + short_fp, false); out: efi_free_pool(tmp_dp); @@ -916,7 +916,7 @@ static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag, goto out; } - final_fp = efi_dp_concat(file_path, initrd_dp); + final_fp = efi_dp_concat(file_path, initrd_dp, true); if (!final_fp) { printf("Cannot create final device path\n"); r = CMD_RET_FAILURE; diff --git a/include/efi_loader.h b/include/efi_loader.h index 34e7fbbf1840..d3725041b20d 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -819,8 +819,6 @@ efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp); /* size of multi-instance device path excluding end node */ efi_uintn_t efi_dp_size(const struct efi_device_path *dp); struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp); -struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, - const struct efi_device_path *dp2); struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp, const struct efi_device_path *node); /* Create a device path node of given type, sub-type, length */ @@ -937,7 +935,8 @@ struct efi_load_option { struct efi_device_path *efi_dp_from_lo(struct efi_load_option *lo, const efi_guid_t *guid); struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, - const struct efi_device_path *dp2); + const struct efi_device_path *dp2, + bool split_end_node); struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path); efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data, efi_uintn_t *size); diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c index a032d3ae04e2..dd2dd23c7b5a 100644 --- a/lib/efi_loader/efi_bootmgr.c +++ b/lib/efi_loader/efi_bootmgr.c @@ -143,7 +143,7 @@ static efi_status_t try_load_from_file_path(efi_handle_t *fs_handles, if (!dp) continue; - dp = efi_dp_append(dp, fp); + dp = efi_dp_concat(dp, fp, false); if (!dp) continue; @@ -1579,8 +1579,8 @@ efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size) goto out; msg_path = file_path; } else { - file_path = efi_dp_append(bootefi_device_path, - bootefi_image_path); + file_path = efi_dp_concat(bootefi_device_path, + bootefi_image_path, false); msg_path = bootefi_image_path; log_debug("Loaded from disk\n"); } diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index c579d89211be..1951291747cd 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -1816,7 +1816,7 @@ efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path, if (device_path) { info->device_handle = efi_dp_find_obj(device_path, NULL, NULL); - dp = efi_dp_append(device_path, file_path); + dp = efi_dp_concat(device_path, file_path, false); if (!dp) { ret = EFI_OUT_OF_RESOURCES; goto failure; diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index 8dbd8105ae26..500fa10d405f 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -271,30 +271,27 @@ struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp) } /** - * efi_dp_append_or_concatenate() - Append or concatenate two device paths. - * Concatenated device path will be separated - * by a sub-type 0xff end node + * efi_dp_concat() - Concatenate two device paths and add and terminate them + * with an end node. * - * @dp1: First device path - * @dp2: Second device path - * @concat: If true the two device paths will be concatenated and separated - * by an end of entrire device path sub-type 0xff end node. - * If true the second device path will be appended to the first and - * terminated by an end node + * @dp1: First device path + * @dp2: Second device path + * @split_end_node: If true the two device paths will be concatenated and + * separated by an end node (DEVICE_PATH_SUB_TYPE_END). + * If false the second device path will be concatenated to the + * first one as-is. * * Return: * concatenated device path or NULL. Caller must free the returned value */ -static struct -efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1, - const struct efi_device_path *dp2, - bool concat) +struct +efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, + const struct efi_device_path *dp2, + bool split_end_node) { struct efi_device_path *ret; - size_t end_size = sizeof(END); + size_t end_size; - if (concat) - end_size = 2 * sizeof(END); if (!dp1 && !dp2) { /* return an end node */ ret = efi_dp_dup(&END); @@ -306,14 +303,20 @@ efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1, /* both dp1 and dp2 are non-null */ unsigned sz1 = efi_dp_size(dp1); unsigned sz2 = efi_dp_size(dp2); - void *p = efi_alloc(sz1 + sz2 + end_size); + void *p; + + if (split_end_node) + end_size = 2 * sizeof(END); + else + end_size = sizeof(END); + p = efi_alloc(sz1 + sz2 + end_size); if (!p) return NULL; ret = p; memcpy(p, dp1, sz1); p += sz1; - if (concat) { + if (split_end_node) { memcpy(p, &END, sizeof(END)); p += sizeof(END); } @@ -327,37 +330,6 @@ efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1, return ret; } -/** - * efi_dp_append() - Append a device to an existing device path. - * - * @dp1: First device path - * @dp2: Second device path - * - * Return: - * concatenated device path or NULL. Caller must free the returned value - */ -struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, - const struct efi_device_path *dp2) -{ - return efi_dp_append_or_concatenate(dp1, dp2, false); -} - -/** - * efi_dp_concat() - Concatenate 2 device paths. The final device path will - * contain two device paths separated by and end node (0xff). - * - * @dp1: First device path - * @dp2: Second device path - * - * Return: - * concatenated device path or NULL. Caller must free the returned value - */ -struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, - const struct efi_device_path *dp2) -{ - return efi_dp_append_or_concatenate(dp1, dp2, true); -} - struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp, const struct efi_device_path *node) { diff --git a/lib/efi_loader/efi_device_path_utilities.c b/lib/efi_loader/efi_device_path_utilities.c index 844d8acd67c0..c95dbfa9b5f6 100644 --- a/lib/efi_loader/efi_device_path_utilities.c +++ b/lib/efi_loader/efi_device_path_utilities.c @@ -76,7 +76,7 @@ static struct efi_device_path * EFIAPI append_device_path( const struct efi_device_path *src2) { EFI_ENTRY("%pD, %pD", src1, src2); - return EFI_EXIT(efi_dp_append(src1, src2)); + return EFI_EXIT(efi_dp_concat(src1, src2, false)); } /* -- 2.37.2
