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On 30/09/2021 13:58, Grant Edwards wrote: |
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> On 2021-09-30, Grant Edwards <grant.b.edwards@×××××.com> wrote: |
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>> On 2021-09-30, Grant Edwards <grant.b.edwards@×××××.com> wrote: |
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>> |
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>>> I'm trying to add NET_ADMIN capability to an executable that needs to |
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>>> create a tun inteface. AFACIT, this is the command to do that: |
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>>> |
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>>> $ sudo setcap cap_net_admin+ep example_app |
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>>> Failed to set capabilities on file `example_app' (Operation not supported) |
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>>> |
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>>> The only possible cause for that message Google has been able fo find |
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>>> is that the FS doesn't have xattr support. |
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>> |
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>> Is Posix ACL support required for setcap? |
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>> |
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>> I can't find any documentation of such a requirement, but it's the |
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>> only other thing I can think of... |
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> |
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> That's not it. I rebuilt my kernel with POSIX ACL support enabled for |
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> ext4, rebooted, and verified that ACLs now work. |
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> |
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> Still can't figure out how to get setcap to work |
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> |
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> # file example_app |
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> example_app: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, with debug_info, not stripped |
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> |
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> # setcap cap_net_admin,cap_net_raw+eip example_app |
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> Failed to set capabilities on file `example_app' (Operation not supported) |
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> |
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> -- |
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> Grant |
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> |
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> |
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Not sure if this is it, but do you have CONFIG_EXT4_FS_SECURITY enabled? |
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