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stub: Mention that VirtualSize should be <= SizeOfRawData

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(cherry picked from commit 2443b4d9a17787fd0a63d6591fbdb74650c43994)
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Daan De Meyer 2025-02-04 14:52:02 +01:00 committed by Luca Boccassi
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commit e8d5d7f355
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man/systemd-stub.xml
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@ -376,6 +376,15 @@
core kernel, the embedded initrd and kernel command line (see above for a full list), including all UKI
profiles.</para>
<para>Also note that when <command>systemd-stub</command> measures a PE section, it will measure the
amount of bytes that the section takes up in memory (<varname>VirtualSize</varname>) and not the amount
of bytes that the section takes up on disk (<varname>SizeOfRawData</varname>). This means that if the
size in memory is larger than the size on disk, <command>systemd-stub</command> will end up measuring
extra zeroes. To avoid this from happening, it is recommended to make sure that the size in memory of
each section that is measured by <command>systemd-stub</command> is always smaller than or equal to the
size on disk. <command>ukify</command> automatically makes sure this is the case when building UKIs or
addons.</para>
<para>Also note that the Linux kernel will measure all initrds it receives into TPM PCR 9. This means
every type of initrd (of the selected UKI profile) will possibly be measured two or three times: the
initrds embedded in the kernel image will be measured to PCR 4, PCR 9 and PCR 11; the initrd synthesized