Hi all,
I have recently came up against this problem myself, and have fixed /
submitted a patch to the openssh development team. Here is the original
report:
So I modified the code to try and repair this oom_adj problem...
port-linux.c:
line 235: //static int oom_adj_save = INT_MIN;
line 236: static int oom_adj_save = 0;
line 277: verbose("Set %s to %d - sleepycal", OOM_ADJ_PATH, oom_adj_save);
I then ran compiled the package, ran SSHd, and yet we still have -17 in
oom_adj_save. Wtf? Now, I'm not much of a C coder, but this is weird even in my
books...
May 30 22:18:19 vicky sshd[12825]: Set /proc/self/oom_adj to -17 -
sleepycal
So, I went all out crazy, and did the following patch:
static int sleepycal_oom_adj_save = 0;
verbose("sleepycal_oom_adj_save=%d", sleepycal_oom_adj_save);
if (fprintf(fp, "%d\n", sleepycal_oom_adj_save) <= 0)
verbose("error writing %s: %s", OOM_ADJ_PATH, strerror(errno));
else
verbose("Set %s to %d - sleepycal", OOM_ADJ_PATH,
sleepycal_oom_adj_save);
And it worked!!! :)
May 30 22:27:12 vicky sshd[2532]: sleepycal_oom_adj_save=0
May 30 22:27:12 vicky sshd[2532]: Set /proc/self/oom_adj to 0 - sleepycal
root@vicky:~/openssh-5.5p1# cat /proc/2532/oom_adj
0
So, it turns out that it is actually OpenSSH which is broken, after
almost 3 days of frustrating digging through millions of lines of code
lol. Anyways, would appreciate if someone could get this merged into
master (obv rename the vars if you want).
Attached is the appropriate patch file as of openssh-5.5p1
Cal
** Patch added: "oom_patch_for_openssh-5.5p1_by_sleepycal.patch"
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/293000/+attachment/2148347/+files/oom_patch_for_openssh-5.5p1_by_sleepycal.patch
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https://bugs.launchpad.net/bugs/293000
Title:
hardy: openssh-server oom_adj can lead to denial of service
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