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efi/esrt: Allow ESRT access without CAP_SYS_ADMIN

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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 <nicholasbishop@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Nicholas Bishop 2023-05-12 19:43:02 +00:00 committed by Ard Biesheuvel
parent d86ff3333c
commit d0a1865cf7
1 changed files with 0 additions and 4 deletions
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4
drivers/firmware/efi/esrt.c
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@ -95,10 +95,6 @@ static ssize_t esre_attr_show(struct kobject *kobj,
struct esre_entry *entry = to_entry(kobj);
struct esre_attribute *attr = to_attr(_attr);
/* Don't tell normal users what firmware versions we've got... */
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return attr->show(entry, buf);
}