New field seen in audit.log

[Richard Guy Briggs]

On 2019-10-18 08:38, Evelyn Mitchell wrote:
> For my own learning, I'm trying to understand what personality=40000 means.
> 
> In looking at /uapi/linux/personality.h where the
> personality types are defined, and manually converting 40000 to hex
> 0x9C40, it looks to me like the personality is set to enable:
> ADDR_LIMIT_3GB =        0x8000000
> SHORT_INODE =           0x1000000
> ADDR_LIMIT_32BIT =      0x0800000
> READ_IMPLIES_EXEC =     0x0400000
> ADDR_COMPAT_LAYOUT =    0x0200000
> MMAP_PAGE_ZERO =        0x0100000
> ADDR_NO_RANDOMIZE =     0x0040000
> 
> But, this looks unreasonable to me as a set of flags someone would
> deliberately pick, so I thought I'd ask if I'm interpreting this
> correctly.

The per value printed is hex ("per=%lx"), (so really the output could be
prefixed with 0x) so the only flag that applies is ADDR_NO_RANDOMIZE.

> Evelyn Mitchell
> 
> > You may never have seen it before because it appears you now have a
> > personality other than PER_LINUX for this event.  32-bit binary on 64
> > bit?  I assume your arch is x86 64 (LE)?
> >
> > > type=SYSCALL msg=audit(1571245536.351:43593): arch=c000003e syscall=3
> > > *per=40000* success=yes exit=0 a0=5 a1=5 a2=556213b6d6bc a3=7f483b98bcc0
> > > items=0 ppid=2653 pid=2655 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000
> > > fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=pts1 ses=3 comm="gdb"
> > > exe="/usr/bin/gdb" key=(null)
> >
> > - RGB

- RGB

--
Richard Guy Briggs <rgb at redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
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