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Use read_full_file_full() in read_smbios11_field()

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read_virtual_file() will only read up to page size bytes of data
from /sys/firmware/dmi/entries/.../raw so let's use read_full_file_full()
instead to make sure we read all data.

This should be safe since smbios11 data can be considered immutable
during the lifetime of the system.
This commit is contained in:
Daan De Meyer 2024-06-28 20:12:51 +02:00 committed by Lennart Poettering
parent 8c399057f4
commit 53ee7e0aa1
1 changed files with 7 additions and 2 deletions
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9
src/shared/smbios11.c
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@ -33,10 +33,15 @@ int read_smbios11_field(unsigned i, size_t max_size, char **ret_data, size_t *re
assert_cc(offsetof(struct dmi_field_header, contents) == 5);
r = read_virtual_file(
p,
/* We don't use read_virtual_file() because it only reads a single page of bytes from the DMI sysfs
* file. Since the SMBIOS data is immutable after boot, it's safe to use read_full_file_full() here. */
r = read_full_file_full(
AT_FDCWD, p,
/* offset = */ UINT64_MAX,
max_size >= SIZE_MAX - offsetof(struct dmi_field_header, contents) ? SIZE_MAX :
sizeof(dmi_field_header) + max_size,
/* flags = */ 0,
/* bind_name = */ NULL,
(char**) &data, &size);
if (r < 0)
return r;