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From niza...@vl.ru
Subject [users@httpd] apache2 mod_rewrite memleak
Date Mon, 19 Jun 2017 05:04:53 GMT
Hello,

We detect memleak in apache2 with mod_rewrite

steps for repeat:

create directory structure
.
└── categories
     └── test
     └── .htaccess


cat ./categories/.htaccess

RewriteEngine On
RewriteBase /categories/
RewriteRule "^(.*)\ (.*)$" "$1-$2" [R=301,N,QSA]

after it sent request to apache
curl -H "Host: example.com" 
http://127.0.0.1/categories/test/%3C/a%20href=

apache eating all memory and we got this in strace output
lstat("/var/www/html/example.com/categories/test", 
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/var/www/html/example.com/categories/test/.htaccess", 
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
lstat("/var/www/html/example.com/categories/test/<", 0x7f7c0d7e9aa0) = 
-1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c2286c000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c2286a000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c22868000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c22866000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c22864000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c22862000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c22860000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c2285e000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c2285c000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7f7c2285a000


Please could you clarify is it bug or feature?

This memleak is not good for shared hosting.


------
Best Regards
Nizamov Mikhail

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