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Update docs around capabilities and root processes 

Current documentation is misleading: if a service runs as root and
doesn't specify any capabilities, then it will start with all the
capabilities (note that whether it can use them is controlled by
selinux).

Test: n/a
Bug: 249796710
Change-Id: I0d6a884127c6a6c5b651c1222fcf48322065daae
This commit is contained in:
Nikita Ioffe 2022-12-14 21:53:57 +00:00
parent 3460b75289
commit cc0e90a964
1 changed files with 5 additions and 3 deletions
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8
init/README.md
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@ -195,8 +195,10 @@ runs the service.
capability without the "CAP\_" prefix, like "NET\_ADMIN" or "SETPCAP". See
http://man7.org/linux/man-pages/man7/capabilities.7.html for a list of Linux
capabilities.
If no capabilities are provided, then all capabilities are removed from this service, even if it
runs as root.
If no capabilities are provided, then behaviour depends on the user the service runs under:
* if it's root, then the service will run with all the capabitilies (note: whether the
service can actually use them is controlled by selinux);
* otherwise all capabilities will be dropped.
`class <name> [ <name>\* ]`
> Specify class names for the service. All services in a
@ -410,7 +412,7 @@ runs the service.
using this new mechanism, processes can use the user option to
select their desired uid without ever running as root.
As of Android O, processes can also request capabilities directly in their .rc
files. See the "capabilities" option below.
files. See the "capabilities" option above.
`writepid <file> [ <file>\* ]`
> Write the child's pid to the given files when it forks. Meant for