kernel/linux.git/drivers/firmware/efi/esrt.c, branch v7.1

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

efi/esrt: remove esre_attribute::store()

2024-12-13T07:43:58+00:00

esre_attribute::store() is not needed since commit af97a77bc01c (efi: Move some sysfs files to be read-only by root). Drop it. Found by https://github.com/jirislaby/clang-struct. Signed-off-by: Jiri Slaby (SUSE) Cc: Ard Biesheuvel Cc: linux-efi@vger.kernel.org Signed-off-by: Ard Biesheuvel

efi/esrt: Allow ESRT access without CAP_SYS_ADMIN

2023-06-06T13:33:59+00:00

Access to the files in /sys/firmware/efi/esrt has been restricted to CAP_SYS_ADMIN since support for ESRT was added, but this seems overly restrictive given that the files are read-only and just provide information about UEFI firmware updates. Remove the CAP_SYS_ADMIN restriction so that a non-root process can read the files, provided a suitably-privileged process changes the file ownership first. The files are still read-only and still owned by root by default. Signed-off-by: Nicholas Bishop Signed-off-by: Ard Biesheuvel

efi: make kobj_type structure constant

2023-05-10T17:00:52+00:00

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.") the driver core allows the usage of const struct kobj_type. Take advantage of this to constify the structure definition to prevent modification at runtime. Signed-off-by: Thomas Weißschuh Signed-off-by: Ard Biesheuvel

efi: Actually enable the ESRT under Xen

2023-01-23T10:33:24+00:00

The ESRT can be parsed if EFI_PARAVIRT is enabled, even if EFI_MEMMAP is not. Also allow the ESRT to be in reclaimable memory, as that is where future Xen versions will put it. Reported-by: Marek Marczykowski-Górecki Signed-off-by: Demi Marie Obenour Tested-by: Marek Marczykowski-Górecki Signed-off-by: Ard Biesheuvel

efi: memmap: Disregard bogus entries instead of returning them

2023-01-22T09:14:15+00:00

The ESRT code currently contains two consistency checks on the memory descriptor it obtains, but one of them is both incomplete and can only trigger on invalid descriptors. So let's drop these checks, and instead disregard descriptors entirely if the start address is misaligned, or if the number of pages reaches to or beyond the end of the address space. Note that the memory map as a whole could still be inconsistent: multiple entries might cover the same area, or the address could be outside of the addressable PA space, but validating that goes beyond the scope of these helpers. Also note that since the physical address space is never 64-bits wide, a descriptor that includes the last page of memory is not valid. This is fortunate, since it means that a valid physical address will never be an error pointer and that the length of a memory descriptor in bytes will fit in a 64-bit unsigned integer. Co-developed-by: Ard Biesheuvel Signed-off-by: Ard Biesheuvel Signed-off-by: Demi Marie Obenour Tested-by: Marek Marczykowski-Górecki Signed-off-by: Ard Biesheuvel

efi: use default_groups in kobj_type

2022-01-06T20:19:05+00:00

There are currently 2 ways to create a set of sysfs files for a kobj_type, through the default_attrs field, and the default_groups field. Move the firmware efi sysfs code to use default_groups field which has been the preferred way since aa30f47cf666 ("kobject: Add support for default attribute groups to kobj_type") so that we can soon get rid of the obsolete default_attrs field. Cc: Ard Biesheuvel Cc: linux-efi@vger.kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ard Biesheuvel

efi/esrt: Fix reference count leak in esre_create_sysfs_entry.

2020-06-15T12:38:56+00:00

kobject_init_and_add() takes reference even when it fails. If this function returns an error, kobject_put() must be called to properly clean up the memory associated with the object. Previous commit "b8eb718348b8" fixed a similar problem. Fixes: 0bb549052d33 ("efi: Add esrt support") Signed-off-by: Qiushi Wu Link: https://lore.kernel.org/r/20200528183804.4497-1-wu000273@umn.edu Signed-off-by: Ard Biesheuvel

efi/esrt: Clean up efi_esrt_init

2020-02-23T20:57:59+00:00

Remove an unused variable in __init efi_esrt_init(). Simplify a logical constraint. Signed-off-by: Heinrich Schuchardt Link: https://lore.kernel.org/r/20200223204557.114634-1-xypron.glpk@gmx.de Signed-off-by: Ard Biesheuvel