hi,
Please do not double posts both in the bug report and here. Or it will
be a pain to follow.
Cheers,
On Tue, Jul 13, 2010 at 11:08 AM, Vincenzo D'Amore <v.dam...@gmail.com> wrote:
> Hello All,
>
> could anybody explain me why if safe_mode or open_basedir are set, realpath
> cache is disabled?
>
> Looking at source code main/main.c of 5.2.13 I can see:
>
> 1292: /* Disable realpath cache if safe_mode or open_basedir are set */
> if (PG(safe_mode) || (PG(open_basedir) && *PG(open_basedir))) {
> CWDG(realpath_cache_size_limit) = 0;
> }
>
> 1769: /* Disable realpath cache if safe_mode or open_basedir are set */
> if (PG(safe_mode) || (PG(open_basedir) && *PG(open_basedir))) {
> CWDG(realpath_cache_size_limit) = 0;
> }
>
> So realpath cache is definitely disabled in case of safe_mode or
> open_basedir.
>
> This dramatically reduce performance of PHP Engine and, in a big production
> environment, this behavior can bring servers to its knees.
> Especially because there is a lack of documentation!
>
>
> On Fri, Jul 9, 2010 at 7:39 PM, Vincenzo D'Amore <v.dam...@gmail.com> wrote:
>
>> Hello all,
>>
>> I have already notified to the mailing list a performance problem with
>> apache/mod_php5.
>>
>> Now I have an update and I think this is probably a bug.
>> PHP lstat the full path more times before read the file when in apache
>> httpd configuration is specified *PHP_ADMIN_VALUE open_basedir *setting.
>>
>> I have a simple website with only phpinfo.php page and inside we have only
>> "<? phpinfo() ?>".
>>
>> httpd.2.2.15 fresh compiled and PHP 5.2.13.
>>
>> If is specified *PHP_ADMIN_VALUE open_basedir* in Virtual host
>> configuration:
>>
>> <Directory "/usr/local/myspace/webspace/httpdocs">
>> * PHP_ADMIN_VALUE open_basedir
>> "/usr/local/myspace/webspace"*
>> </Directory>
>> <VirtualHost *:80>
>> ServerName damorealt.xoom.it
>> DocumentRoot "/usr/local/myspace/webspace/httpdocs"
>> CustomLog /var/log/httpd/damorealt/access_log combined
>> ErrorLog /var/log/httpd/damorealt/error_log
>> </VirtualHost >
>>
>> Calling page http://damorealt.xoom.it/phpinfo.php we can reproduce
>> following behavior:
>>
>> 25933 accept(3, {sa_family=AF_INET, sin_port=htons(47433),
>> sin_addr=inet_addr("212.48.14.186")}, [17179869200]) = 15
>> 25933 getsockname(15, {sa_family=AF_INET, sin_port=htons(80),
>> sin_addr=inet_addr("151.99.197.198")}, [17179869200]) = 0
>> 25933 fcntl(15, F_GETFL) = 0x2 (flags O_RDWR)
>> 25933 fcntl(15, F_SETFL, O_RDWR|O_NONBLOCK) = 0
>> 25933 read(15, "GET /phpinfo.php HTTP/1.0\r\nUser-"..., 8000) = 129
>> 25933 gettimeofday({1278695388, 52976}, NULL) = 0
>> 25933 stat("/usr/local/myspace/webspace/httpdocs/phpinfo.php",
>> {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>> 25933 open("/usr/local/myspace/.htaccess", O_RDONLY) = -1 ENOENT (No such
>> file or directory)
>> 25933 open("/usr/local/myspace/webspace/.htaccess", O_RDONLY) = -1 ENOENT
>> (No such file or directory)
>> 25933 open("/usr/local/myspace/webspace/httpdocs/.htaccess", O_RDONLY) = -1
>> ENOENT (No such file or directory)
>> 25933 open("/usr/local/myspace/webspace/httpdocs/phpinfo.php/.htaccess",
>> O_RDONLY) = -1 ENOTDIR (Not a directory)
>> 25933 setitimer(ITIMER_PROF, {it_interval={0, 0}, it_value={20, 0}}, NULL)
>> = 0
>> 25933 rt_sigaction(SIGPROF, {0x2b80442fdd80, [PROF],
>> SA_RESTORER|SA_RESTART, 0x3916e302d0}, {SIG_DFL, [], 0}, 8) = 0
>> 25933 rt_sigprocmask(SIG_UNBLOCK, [PROF], NULL, 8) = 0
>> 25933 getcwd("/"..., 4095) = 2
>> 25933 chdir("/usr/local/myspace/webspace/httpdocs") = 0
>>
>> *water boiling point*
>>
>> 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096,
>> ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php",
>> {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>>
>> First check
>>
>> 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096,
>> ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php",
>> {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>>
>> Second check
>>
>> 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096,
>> ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>>
>> Third check (incomplete)
>>
>> 25933 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096,
>> ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 25933 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php",
>> {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>>
>> Final check and then read the file.
>>
>> 25933 open("/usr/local/myspace/webspace/httpdocs/phpinfo.php", O_RDONLY) =
>> 16
>> 25933 fstat(16, {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>> 25933 read(16, "<? phpinfo() ?>\n", 8192) = 16
>> 25933 read(16, "", 8192) = 0
>> 25933 read(16, "", 8192) = 0
>> 25933 close(16) = 0
>>
>>
>> If *PHP_ADMIN_VALUE open_basedir "/usr/local/myspace/webspace" is removed
>> * in virtual host configuration we finally have simpliest behavior:
>>
>> 226235 accept(3, {sa_family=AF_INET, sin_port=htons(59366),
>> sin_addr=inet_addr("212.48.14.186")}, [17179869200]) = 15
>> 26235 getsockname(15, {sa_family=AF_INET, sin_port=htons(80),
>> sin_addr=inet_addr("151.99.197.198")}, [17179869200]) = 0
>> 26235 fcntl(15, F_GETFL) = 0x2 (flags O_RDWR)
>> 26235 fcntl(15, F_SETFL, O_RDWR|O_NONBLOCK) = 0
>> 26235 read(15, "GET /phpinfo.php HTTP/1.0\r\nUser-"..., 8000) = 129
>> 26235 gettimeofday({1278696735, 988799}, NULL) = 0
>> 26235 stat("/usr/local/myspace/webspace/httpdocs/phpinfo.php",
>> {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>> 26235 open("/usr/local/myspace/.htaccess", O_RDONLY) = -1 ENOENT (No such
>> file or directory)
>> 26235 open("/usr/local/myspace/webspace/.htaccess", O_RDONLY) = -1 ENOENT
>> (No such file or directory)
>> 26235 open("/usr/local/myspace/webspace/httpdocs/.htaccess", O_RDONLY) = -1
>> ENOENT (No such file or directory)
>> 26235 open("/usr/local/myspace/webspace/httpdocs/phpinfo.php/.htaccess",
>> O_RDONLY) = -1 ENOTDIR (Not a directory)
>> 26235 setitimer(ITIMER_PROF, {it_interval={0, 0}, it_value={20, 0}}, NULL)
>> = 0
>> 26235 rt_sigaction(SIGPROF, {0x2afef587dd80, [PROF],
>> SA_RESTORER|SA_RESTART, 0x3916e302d0}, {SIG_DFL, [], 0}, 8) = 0
>> 26235 rt_sigprocmask(SIG_UNBLOCK, [PROF], NULL, 8) = 0
>> 26235 getcwd("/"..., 4095) = 2
>> 26235 chdir("/usr/local/myspace/webspace/httpdocs") = 0
>>
>> *water boiling point*
>>
>> 26235 time(NULL) = 1278696735
>> 26235 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 26235 lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>> 26235 lstat("/usr/local/myspace", {st_mode=S_IFDIR|0755, st_size=4096,
>> ...}) = 0
>> 26235 lstat("/usr/local/myspace/webspace", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 26235 lstat("/usr/local/myspace/webspace/httpdocs", {st_mode=S_IFDIR|0755,
>> st_size=4096, ...}) = 0
>> 26235 lstat("/usr/local/myspace/webspace/httpdocs/phpinfo.php",
>> {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>>
>> And read the file.
>>
>> 26235 open("/usr/local/myspace/webspace/httpdocs/phpinfo.php", O_RDONLY) =
>> 16
>> 26235 fstat(16, {st_mode=S_IFREG|0644, st_size=16, ...}) = 0
>> 26235 read(16, "<? phpinfo() ?>\n", 8192) = 16
>> 26235 read(16, "", 8192) = 0
>> 26235 read(16, "", 8192) = 0
>> 26235 close(16) = 0
>> 26235 uname({sys="Linux", node="svilpar4", ...}) = 0
>> 26235 time(NULL) = 1278696735
>> 26235 writev(15, [{"HTTP/1.1 200 OK\r\nDate: Fri, 09 J"..., 173},
>> {"<!DOCTYPE html PUBLIC \"-//W3C//D"..., 4109}, {"<table border=\"0\"
>> cellpadding=\"3"..., 4101}], 3) = 8383
>> 26235 writev(15, [{"<tr><td class=\"e\">highlight.bg</"..., 4105},
>> {"sendmail_from</td><td class=\"v\">"..., 4099}], 2) = 8204
>> 26235 time(NULL) = 1278696735
>> 26235 writev(15, [{" </td></tr>\n<tr><td class=\"e\">HT"..., 4108},
>> {"</td><td class=\"v\">1024</td><td "..., 4098}], 2) = 8206
>> 26235 writev(15, [{"md2 md4 md5 sha1 sha256 sha384 s"..., 4098}, {"
>> </td></tr>\n</table><br />\n<tabl"..., 4106}], 2) = 8204
>> 26235 writev(15, [{"session.use_cookies</td><td clas"..., 4104}, {"
>> </td><td class=\"v\">enabled </td"..., 4102}], 2) = 8206
>> 26235 chdir("/") = 0
>> 26235 setitimer(ITIMER_PROF, {it_interval={0, 0}, it_value={0, 0}}, NULL) =
>> 0
>> 26235 writev(15, [{"\"]</td><td class=\"v\">Keep-Alive<"..., 4206}], 1) =
>> 4206
>> 26235 write(10, "212.48.14.186 - - [09/Jul/2010:1"..., 116) = 116
>> 26235 shutdown(15, 1 /* send */) = 0
>> 26235 poll([{fd=15, events=POLLIN}], 1, 2000) = 1 ([{fd=15,
>> revents=POLLIN|POLLHUP}])
>> 26235 read(15, "", 512) = 0
>> 26235 close(15) = 0
>> 26235 read(4, 0x7fff615ff5eb, 1) = -1 EAGAIN (Resource temporarily
>> unavailable)
>> 26235 accept(3,
>>
>> Note that this behavior also happens when safemode is ON.
>>
>> Can somebody explain me why PHP have such behavior?
>>
>> Best regards,
>> Vincenzo
>>
>
>
>
> --
> Vincenzo D'Amore
> email: v.dam...@gmail.com
> msn: free...@hotmail.com
> skype: free.dev
> mobile: +39 349 8513251
>
--
Pierre
@pierrejoye | http://blog.thepimp.net | http://www.libgd.org
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