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Message-ID: <CA+icZUUdtRm7uHPT=TtT1BEE0dQU3pFP-nvqwBE7ES1F_kvXSA@mail.gmail.com>
Date: Thu, 13 Aug 2020 10:27:04 +0200
From: Sedat Dilek <sedat.dilek@...il.com>
To: George Spelvin <lkml@....org>
Cc: Amit Klein <aksecurity@...il.com>,
Eric Dumazet <edumazet@...gle.com>,
"Jason A. Donenfeld" <Jason@...c4.com>,
Andy Lutomirski <luto@...nel.org>,
Kees Cook <keescook@...omium.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
netdev@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: Re: [DRAFT PATCH] random32: make prandom_u32() output unpredictable
I run a perf session looks like this in my KDE/Plasma desktop-environment:
[ PERF SESSION ]
1016 2020-08-13 09:57:24 echo 1 > /proc/sys/kernel/sched_schedstats
1017 2020-08-13 09:57:24 echo prandom_u32 >>
/sys/kernel/debug/tracing/set_event
1018 2020-08-13 09:57:24 echo traceon >
/sys/kernel/debug/tracing/events/random/prandom_u32/trigger
1019 2020-08-13 09:57:25 echo 1 > /sys/kernel/debug/tracing/events/enable
1020 2020-08-13 09:57:32 sysctl -n kernel.sched_schedstats
1021 2020-08-13 09:57:32 cat /sys/kernel/debug/tracing/events/enable
1022 2020-08-13 09:57:32 grep prandom_u32 /sys/kernel/debug/tracing/set_event
1023 2020-08-13 09:57:33 cat
/sys/kernel/debug/tracing/events/random/prandom_u32/trigger
root# /home/dileks/bin/perf record -a -g -e random:prandom_u32 sleep 5
Simple-Test: Press F5 in Firefox in each opened tab (5 tabs in total)
root# /home/dileks/bin/perf report --no-children --stdio > /tmp/perf-report.txt
- Sedat -
[ perf-report.txt ]
# To display the perf.data header info, please use
--header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 273 of event 'random:prandom_u32'
# Event count (approx.): 273
#
# Overhead Command Shared Object Symbol
# ........ ............... ................. ...............
#
27.47% firefox-esr [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
shmem_mknod
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7a6f6d2e67726f2f
13.19% DNS Resolver #9 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
|
|--5.86%--__ip4_datagram_connect
| ip4_datagram_connect
| __sys_connect
| __x64_sys_connect
| do_syscall_64
| entry_SYSCALL_64_after_hwframe
| |
| |--4.40%--__libc_connect
| | 0x2c1
| |
| --1.47%--connect
| PR_GetAddrInfoByName
|
|--2.93%--udp_lib_get_port
| inet_dgram_connect
| __sys_connect
| __x64_sys_connect
| do_syscall_64
| entry_SYSCALL_64_after_hwframe
| |
| |--2.20%--__libc_connect
| | 0x2c1
| |
| --0.73%--connect
| PR_GetAddrInfoByName
|
|--2.20%--__ip_select_ident
| __ip_make_skb
| ip_make_skb
| udp_sendmsg
| __sys_sendto
| __x64_sys_sendto
| do_syscall_64
| entry_SYSCALL_64_after_hwframe
| __libc_send
|
--2.20%--netlink_autobind
netlink_bind
__sys_bind
__x64_sys_bind
do_syscall_64
entry_SYSCALL_64_after_hwframe
bind
getaddrinfo
PR_GetAddrInfoByName
12.45% FS Broker 7060 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
shmem_mknod
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7a6f6d2e67726f2f
8.79% FS Broker 6334 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
shmem_mknod
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7a6f6d2e67726f2f
8.06% FS Broker 7161 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
shmem_mknod
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7a6f6d2e67726f2f
8.06% FS Broker 7195 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
shmem_mknod
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7a6f6d2e67726f2f
7.33% FS Broker 7126 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
shmem_mknod
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7a6f6d2e67726f2f
7.33% Socket Thread [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
tcp_v4_connect
__inet_stream_connect
inet_stream_connect
__sys_connect
__x64_sys_connect
do_syscall_64
entry_SYSCALL_64_after_hwframe
__libc_connect
4.40% Cache2 I/O [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
__ext4_new_inode
ext4_create
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x61632e2f736b656c
1.10% Xorg [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
__shmem_file_setup
create_shmem
i915_gem_object_create_region
i915_gem_create_ioctl
drm_ioctl_kernel
drm_ioctl
__se_sys_ioctl
do_syscall_64
entry_SYSCALL_64_after_hwframe
ioctl
0.73% QSGRenderThread [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
shmem_get_inode
__shmem_file_setup
create_shmem
i915_gem_object_create_region
i915_gem_create_ioctl
drm_ioctl_kernel
drm_ioctl
__se_sys_ioctl
do_syscall_64
entry_SYSCALL_64_after_hwframe
ioctl
0.37% DOM Worker [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
__ext4_new_inode
ext4_create
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x6f6d2e2f736b656c
0.37% cupsd [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
__ext4_new_inode
ext4_create
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x7263736275732f73
0.37% mozStorage #8 [kernel.kallsyms] [k] prandom_u32
|
---prandom_u32
prandom_u32
__ext4_new_inode
ext4_create
path_openat
do_filp_open
do_sys_openat2
__x64_sys_openat
do_syscall_64
entry_SYSCALL_64_after_hwframe
__open64
0x6f6d2e2f736b656c
# Samples: 0 of event 'dummy:HG'
# Event count (approx.): 0
#
# Overhead Command Shared Object Symbol
# ........ ....... ............. ......
#
#
# (Tip: Print event counts in CSV format with: perf stat -x,)
#
- EOF -
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