Need to downgrade pcre from 8.21 to 8.20

[Avensen]

After upgrading php to 5.3.10 via EasyApache there is a problem with a vBulletin 3.8.7 site on server.

Looks like a bug in pcre 8.21: Bug 1187 – Pcre 8.21 issue with Vbulletin

Please help to downgrade pcre from 8.21 to 8.20 on the server. CENTOS 5.7 i686, WHM 11.30.6 (build 3).

 

[blowie]

I got same Problem Please Help

 

[squadx]

Me as well, vbulletin does not support anything higher than 8.2.0.

 

[squadx]

It's interesting that bug report says fixed...but it's obviously not

 

[chrismfz]

We will see soon a EasyApache 3.9.>1 (.2 maybe?)
with curl fix and pcre patch ?

It's hard to patch and keep an eye on all servers for those.
Already a mess with both of them (curl when someone uses ssl, pcre with vBulletin forums)

 

[Worelock]

Does anyone have any info on how to downgrade to PCRE 8.20?

 

[chrismfz]

There is a patch, thanks to cPanel support (insert credits here):

cd /var/cpanel/perl/easy/Cpanel/Easy/OptLib
tar -xzvf pcre.pm.tar.gz

echo '--- pcre-8.21/pcre_compile.c 2011/12/07 16:52:34 793
+++ pcre-8.21/pcre_compile.c 2011/12/18 10:03:38 807
@@ -1655,7 +1655,8 @@
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
do cc += GET(cc, 1); while (*cc == OP_ALT);
- /* Fall through */
+ cc += _pcre_OP_lengths[*cc];
+ break;' | patch -p0

tar -czvf pcre.pm.tar.gz pcre-8.21/
rm -Rf pcre-8.21/
chattr +i pcre.pm.tar.gz
rm -Rf /opt/pcre/
/scripts/easyapache --build
chattr -i pcre.pm.tar.gz

Disclaimer:
I am not responsible for anything, dead apache servers, wrecked configurations,
thermonuclear war, or you getting fired because apache failed.

 

[oldlock]

How and where would one install the patch ?

Thanks

 

[oldlock]

Or did anyone find a way to downgrade the PCRE ? I've been searching for over an hour without any luck .......

 

[Avensen]

Thanks chrismfz, your solution worked for me! Except this part:

echo '--- pcre-8.21/pcre_compile.c 2011/12/07 16:52:34 793
+++ pcre-8.21/pcre_compile.c 2011/12/18 10:03:38 807
@@ -1655,7 +1655,8 @@
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
do cc += GET(cc, 1); while (*cc == OP_ALT);
- /* Fall through */
+ cc += _pcre_OP_lengths[*cc];
+ break;' | patch -p0

which gave me an error, however, I opened the pcre-8.21/pcre_compile.c file and edited it manually.

 

[chrismfz]

What exactly didn't work with the patch ?

Third command is a large copy paste not line by line, just the whole:

echo '--- pcre-8.21/pcre_compile.c 2011/12/07 16:52:34 793
+++ pcre-8.21/pcre_compile.c 2011/12/18 10:03:38 807
@@ -1655,7 +1655,8 @@
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
do cc += GET(cc, 1); while (*cc == OP_ALT);
- /* Fall through */
+ cc += _pcre_OP_lengths[*cc];
+ break;' | patch -p0

except if the browser did something, or I misspelled a quote or something else. Maybe a cPanel staff
review it and correct/fix it if I pasted it wrong.

 

[Avensen]

How and where would one install the patch ?

Thanks

You need to have shell root access to your server and then execute commands in this post: http://forums.cpanel.net/f5/need-downgrade-pcre-8-21-8-20-a-257991.html#post1074531

However, I had to edit pcre_compile.c file manually, because in my case patch command executed with error.

 

[oldlock]

The process results in the attached screenshot

 

[oldlock]

Probably a mistake on my part there. I'm running the process from the beginning.

 

[Avensen]

in my case the error with patch command was:

patching file pcre-8.21/pcre_compile.c
patch: **** malformed patch at line 4: case OP_ASSERTBACK:

 

[chrismfz]

Forgot the first 2 commands. Entering the sources folder and extracting pcre.

 

[oldlock]

Still returns an error. Screenshot attached.



I did the commands from the beginning.

 

[Worelock]

for the most part the info above worked. but I got a malformed line when I did the echo, here is what i did to make it work

cd /var/cpanel/perl/easy/Cpanel/Easy/OptLib
tar -xzvf pcre.pm.tar.gz

created a patch file called pcre_patch & added this to it.

--- pcre-8.21/pcre_compile.c 2011/12/07 16:52:34 793
+++ pcre-8.21/pcre_compile.c 2011/12/18 10:03:38 807
@@ -1655,7 +1655,8 @@
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
do cc += GET(cc, 1); while (*cc == OP_ALT);
- /* Fall through */
+ cc += _pcre_OP_lengths[*cc];
+ break;

patch -p1 < pcre_patch
it might ask for the filename to patch, I just typed pcre-8.21/pcre_compile.c
and it patched the file.

then I just ran the rest of the commands from above

tar -czvf pcre.pm.tar.gz pcre-8.21/
rm -Rf pcre-8.21/
chattr +i pcre.pm.tar.gz
rm -Rf /opt/pcre/
/scripts/easyapache --build
chattr -i pcre.pm.tar.gz

My forums are now working again...I'm a happy camper
the code for the patch came from this post http://bugs.exim.org/show_bug.cgi?id=1187

 

[oldlock]

What is the extension for the patch file you created ? Could you detail the steps involved precisely ?

 

[oldlock]

There's a couple of inconsistencies in your file names too ??