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Message-ID: <20241220112214.2598872-15-ardb+git@google.com>
Date: Fri, 20 Dec 2024 12:22:21 +0100
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-efi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH 6/7] efi/libstub: Use cleanup helpers for freeing copies of
the memory map
From: Ard Biesheuvel <ardb@...nel.org>
The EFI stub may obtain the memory map from the firmware numerous times,
and this involves doing a EFI pool allocation first, which needs to be
freed after use.
Streamline this using a cleanup helper, which makes the code easier to
follow.
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
drivers/firmware/efi/libstub/kaslr.c | 4 +---
drivers/firmware/efi/libstub/mem.c | 20 ++++++++------------
drivers/firmware/efi/libstub/randomalloc.c | 4 +---
drivers/firmware/efi/libstub/relocate.c | 10 ++++------
drivers/firmware/efi/libstub/x86-stub.c | 11 ++++++-----
5 files changed, 20 insertions(+), 29 deletions(-)
diff --git a/drivers/firmware/efi/libstub/kaslr.c b/drivers/firmware/efi/libstub/kaslr.c
index 6318c40bda38..4bc963e999eb 100644
--- a/drivers/firmware/efi/libstub/kaslr.c
+++ b/drivers/firmware/efi/libstub/kaslr.c
@@ -57,7 +57,7 @@ u32 efi_kaslr_get_phys_seed(efi_handle_t image_handle)
*/
static bool check_image_region(u64 base, u64 size)
{
- struct efi_boot_memmap *map;
+ struct efi_boot_memmap *map __free(efi_pool) = NULL;
efi_status_t status;
bool ret = false;
int map_offset;
@@ -80,8 +80,6 @@ static bool check_image_region(u64 base, u64 size)
}
}
- efi_bs_call(free_pool, map);
-
return ret;
}
diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c
index 4f1fa302234d..9c82259eea81 100644
--- a/drivers/firmware/efi/libstub/mem.c
+++ b/drivers/firmware/efi/libstub/mem.c
@@ -20,10 +20,10 @@
efi_status_t efi_get_memory_map(struct efi_boot_memmap **map,
bool install_cfg_tbl)
{
+ struct efi_boot_memmap tmp, *m __free(efi_pool) = NULL;
int memtype = install_cfg_tbl ? EFI_ACPI_RECLAIM_MEMORY
: EFI_LOADER_DATA;
efi_guid_t tbl_guid = LINUX_EFI_BOOT_MEMMAP_GUID;
- struct efi_boot_memmap *m, tmp;
efi_status_t status;
unsigned long size;
@@ -48,24 +48,20 @@ efi_status_t efi_get_memory_map(struct efi_boot_memmap **map,
*/
status = efi_bs_call(install_configuration_table, &tbl_guid, m);
if (status != EFI_SUCCESS)
- goto free_map;
+ return status;
}
m->buff_size = m->map_size = size;
status = efi_bs_call(get_memory_map, &m->map_size, m->map, &m->map_key,
&m->desc_size, &m->desc_ver);
- if (status != EFI_SUCCESS)
- goto uninstall_table;
+ if (status != EFI_SUCCESS) {
+ if (install_cfg_tbl)
+ efi_bs_call(install_configuration_table, &tbl_guid, NULL);
+ return status;
+ }
- *map = m;
+ *map = no_free_ptr(m);
return EFI_SUCCESS;
-
-uninstall_table:
- if (install_cfg_tbl)
- efi_bs_call(install_configuration_table, &tbl_guid, NULL);
-free_map:
- efi_bs_call(free_pool, m);
- return status;
}
/**
diff --git a/drivers/firmware/efi/libstub/randomalloc.c b/drivers/firmware/efi/libstub/randomalloc.c
index c41e7b2091cd..e5872e38d9a4 100644
--- a/drivers/firmware/efi/libstub/randomalloc.c
+++ b/drivers/firmware/efi/libstub/randomalloc.c
@@ -59,9 +59,9 @@ efi_status_t efi_random_alloc(unsigned long size,
unsigned long alloc_min,
unsigned long alloc_max)
{
+ struct efi_boot_memmap *map __free(efi_pool) = NULL;
unsigned long total_slots = 0, target_slot;
unsigned long total_mirrored_slots = 0;
- struct efi_boot_memmap *map;
efi_status_t status;
int map_offset;
@@ -130,7 +130,5 @@ efi_status_t efi_random_alloc(unsigned long size,
break;
}
- efi_bs_call(free_pool, map);
-
return status;
}
diff --git a/drivers/firmware/efi/libstub/relocate.c b/drivers/firmware/efi/libstub/relocate.c
index d694bcfa1074..99b45d1cd624 100644
--- a/drivers/firmware/efi/libstub/relocate.c
+++ b/drivers/firmware/efi/libstub/relocate.c
@@ -23,14 +23,14 @@
efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
unsigned long *addr, unsigned long min)
{
- struct efi_boot_memmap *map;
+ struct efi_boot_memmap *map __free(efi_pool) = NULL;
efi_status_t status;
unsigned long nr_pages;
int i;
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
- goto fail;
+ return status;
/*
* Enforce minimum alignment that EFI or Linux requires when
@@ -79,11 +79,9 @@ efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
}
if (i == map->map_size / map->desc_size)
- status = EFI_NOT_FOUND;
+ return EFI_NOT_FOUND;
- efi_bs_call(free_pool, map);
-fail:
- return status;
+ return EFI_SUCCESS;
}
/**
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index 4a3487e5dfc8..4dfd25e6ac71 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -616,7 +616,7 @@ static efi_status_t allocate_e820(struct boot_params *params,
struct setup_data **e820ext,
u32 *e820ext_size)
{
- struct efi_boot_memmap *map;
+ struct efi_boot_memmap *map __free(efi_pool) = NULL;
efi_status_t status;
__u32 nr_desc;
@@ -630,13 +630,14 @@ static efi_status_t allocate_e820(struct boot_params *params,
EFI_MMAP_NR_SLACK_SLOTS;
status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
}
- if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS)
- status = allocate_unaccepted_bitmap(nr_desc, map);
+ if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY))
+ return allocate_unaccepted_bitmap(nr_desc, map);
- efi_bs_call(free_pool, map);
- return status;
+ return EFI_SUCCESS;
}
struct exit_boot_struct {
--
2.47.1.613.gc27f4b7a9f-goog
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