9:38 a.m.
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.
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
--
Richard Guy Briggs <rgb(a)redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635
------------------------------
9:56 a.m.
New subject: New field seen in audit.log
On Friday, October 18, 2019 10:38:08 AM EDT 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.
I think so. The executable is gdb. It needs to disable ASLR so that it can
reliably map the symbols to addresses.
-Steve
> 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
>
> --
> Richard Guy Briggs <rgb(a)redhat.com>
> Sr. S/W Engineer, Kernel Security, Base Operating Systems
> Remote, Ottawa, Red Hat Canada
> IRC: rgb, SunRaycer
> Voice: +1.647.777.2635, Internal: (81) 32635
>
>
>
> ------------------------------
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10:49 a.m.
New subject: New field seen in audit.log
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(a)redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635
1892
days inactive
1892
days old
linux-audit@lists.linux-audit.osci.io
2 comments
3 participants
participants (3)
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Evelyn Mitchell -
Richard Guy Briggs -
Steve Grubb