New field seen in audit.log
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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
Quoted 23 lines
You may never have seen it before because it appears you now have a personality other than
PER_LINUXfor this event. 32-bit binary on 64 bit? I assume your arch is x86 64 (LE)?Quoted 6 lines
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 <[email protected]>
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------------------------------
Quoted 13 lines · EDT Evelyn Mitchell
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
Quoted 3 lines
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
Quoted 29 lines
Quoted 23 lines
You may never have seen it before because it appears you now have a personality other than
PER_LINUXfor this event. 32-bit binary on 64 bit? I assume your arch is x86 64 (LE)?Quoted 7 lines
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 <[email protected]>
Sr. S/W Engineer, Kernel Security, Base Operating Systems Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635Quoted 1 line
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Quoted 13 lines · Evelyn Mitchell
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
Quoted 3 lines
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.
Quoted 13 lines
Evelyn Mitchell
Quoted 11 lines
You may never have seen it before because it appears you now have a personality other than
PER_LINUXfor this event. 32-bit binary on 64 bit? I assume your arch is x86 64 (LE)?Quoted 5 lines
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 <[email protected]>
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