b5fdfedf72
In systemd <= 257, each set_audit tristate value had special meaning, - true: enable the kernel audit subsystem, - false: disable the kernel audit subsystem, - negative: keep the current kernel audit subsystem state. And the default is true, rather than negative. So, users sometimes explicitly pass an empty string to Audit= setting to keep the state. But sincef48cf2a96d(v258), the negative value is mistakenly used as 'really unspecified' even if an empty string is explicitly specified. This makes negative values handled as unspecified as usual, and assign a new positive value AUDIT_KEEP for when an empty string is explicitly specified. Also, make the Audit= setting accept "keep" setting, and suggest to use "keep" rather than an empty string. Fixes a regression caused byf48cf2a96d(v258). Fixes #39057.
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