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