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u-boot/lib/efi_loader
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Alper Nebi Yasak d7fe913f23 efi_loader: Avoid underflow when calculating remaining var store size 
The efi_var_mem_free() function calculates the available size for a new
EFI variable by subtracting the occupied buffer size and the overhead
for a new variable from the maximum buffer size set in Kconfig. This
is then returned as QueryVariableInfo()'s RemainingVariableStorageSize
output.

This can underflow as the calculation is done in and processed as
unsigned integer types. Check for underflow before doing the subtraction
and return zero if there's no space.

Fixes: f1f990a8c9 ("efi_loader: memory buffer for variables")
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2023-07-09 03:53:08 +02:00
..
.gitignore
boothart.c efi_loader: add an EFI binary to print boot hart ID 2022-12-02 19:17:24 +01:00
dtbdump.c efi_loader: move dtbdump.c, initrddump.c to lib/efi_loader 2022-03-20 17:01:00 +01:00
efi_acpi.c
efi_bootmgr.c efi_loader: fix efi_dp_from_file() 2023-05-13 11:09:51 +02:00
efi_boottime.c efi: loader: Make efi_event_queue and efi_register_notify_events static 2023-04-08 07:46:44 +02:00
efi_capsule.c efi_loader: remove unused efi_capsule_authenticate 2023-04-21 08:50:35 +02:00
efi_conformance.c efi_loader: fix efi_ecpt_register() 2023-02-10 13:05:40 +01:00
efi_console.c efi_loader: describe term_get_char() 2023-03-13 13:56:14 +01:00
efi_device_path.c efi_loader: check return value of part_get_info() 2023-06-02 10:59:15 +02:00
efi_device_path_to_text.c efi_loader: simplify efi_str_to_u16() 2023-03-25 11:06:35 +01:00
efi_device_path_utilities.c
efi_disk.c efi_loader: simplify efi_disk_remove 2023-06-16 06:45:20 +02:00
efi_dt_fixup.c treewide: Drop bootm_headers_t typedef 2022-09-29 16:07:57 -04:00
efi_esrt.c efi_loader: fix comment in ESRT code 2023-01-27 18:32:00 +01:00
efi_file.c efi_loader: replace a u16_strdup with alloc + memcpy 2022-11-16 08:34:06 +01:00
efi_firmware.c FWU: Add support for the FWU Multi Bank Update feature 2022-10-31 14:47:32 -04:00
efi_freestanding.c trace: Use notrace for short 2023-01-18 11:49:12 -07:00
efi_gop.c efi_loader: make gop_blt() static 2023-02-10 13:05:40 +01:00
efi_helper.c eficonfig: carve out efi_get_next_variable_name_int calls 2022-12-20 16:06:48 +01:00
efi_hii.c efi_loader: refine set_keyboard_layout() status 2023-01-13 09:09:07 +01:00
efi_hii_config.c
efi_image_loader.c Correct SPL use of EFI_TCG2_PROTOCOL 2023-02-09 16:32:26 -05:00
efi_load_initrd.c efi_loader: remove efi_delete_handle on loadfile2 2022-10-16 12:23:22 +02:00
efi_load_options.c efi_loader: simplify efi_set_load_options() 2022-10-10 16:34:26 +02:00
efi_memory.c efi: loader: Make efi_mem static 2023-04-08 07:46:44 +02:00
efi_net.c efi_loader: fix handling of DHCP acknowledge 2022-12-02 19:17:24 +01:00
efi_riscv.c efi_loader: use EFI_EXIT in efi_riscv_get_boot_hartid 2023-01-13 09:09:07 +01:00
efi_rng.c
efi_root_node.c Correct SPL use of EFI_UNICODE_COLLATION_PROTOCOL2 2023-02-09 16:32:26 -05:00
efi_runtime.c efi: loader: Make efi_runtime_mmio static 2023-04-08 07:46:44 +02:00
efi_setup.c efi_loader: set CapsuleMax from CONFIG_EFI_CAPSULE_MAX 2023-02-19 21:15:15 +01:00
efi_signature.c efi_loader: signature: export efi_hash_regions() 2022-07-05 14:37:16 +02:00
efi_smbios.c
efi_string.c efi: Add string conversion helper 2022-10-06 22:54:57 +02:00
efi_tcg2.c efi_loader: use tpm_auto_start for the tpm device 2023-02-28 09:44:22 +02:00
efi_unicode_collation.c efi_loader: Fix buffer underflow 2022-11-22 11:54:30 +01:00
efi_var_common.c efi_loader: update attribute check for QueryVariableInfo() 2023-02-10 13:05:39 +01:00
efi_var_file.c efi_loader: avoid adding variables twice 2022-12-29 10:51:50 +01:00
efi_var_mem.c efi_loader: Avoid underflow when calculating remaining var store size 2023-07-09 03:53:08 +02:00
efi_var_seed.S
efi_variable.c efi_loader: update SetVariable attribute check 2023-03-13 13:56:14 +01:00
efi_variable_tee.c
efi_watchdog.c
helloworld.c efi_loader: print file path w/o boot device 2023-05-13 11:09:51 +02:00
initrddump.c efi_loader: avoid using HandleProtocol in initrddump.efi 2023-04-08 07:45:34 +02:00
Kconfig efi_loader: set CapsuleMax from CONFIG_EFI_CAPSULE_MAX 2023-02-19 21:15:15 +01:00
Makefile efi_loader: add an EFI binary to print boot hart ID 2022-12-02 19:17:24 +01:00