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Buq#32167 another privilege bypass with DATA/INDEX DIRECTORY.

Browse Source 
test_if_data_home_dir fixed to look into real path.
    Checks added to mi_open for symlinks into data home directory.

 per-file messages:
        include/my_sys.h
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          my_is_symlink interface added

        mysql-test/r/udf.result
          test result fixed (not related to #32167)

        mysys/my_symlink.c
          my_is_symlink() implementsd
          my_realpath() now returns the 'realpath' even if a file isn't a symlink
This commit is contained in:
Alexey Botchkov
2008-07-31 14:42:44 +05:00
parent 2d590c2825
commit 1cbc2f7e3a
3 changed files with 33 additions and 24 deletions
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1
include/my_sys.h
View File

@ -575,6 +575,7 @@ extern int my_close(File Filedes,myf MyFlags);
extern File my_dup(File file, myf MyFlags);
extern int my_mkdir(const char *dir, int Flags, myf MyFlags);
extern int my_readlink(char *to, const char *filename, myf MyFlags);
extern int my_is_symlink(const char *filename);
extern int my_realpath(char *to, const char *filename, myf MyFlags);
extern File my_create_with_symlink(const char *linkname, const char *filename,
int createflags, int access_flags,

6
mysql-test/r/udf.result
View File

@ -1,5 +1,7 @@
drop table if exists t1;
CREATE FUNCTION metaphon RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
Warnings:
Warning 1105 plugin_dir was not specified
CREATE FUNCTION myfunc_double RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
ERROR HY000: Can't find function 'myfunc_nonexist' in library
@ -197,6 +199,8 @@ DROP FUNCTION avgcost;
select * from mysql.func;
name ret dl type
CREATE FUNCTION is_const RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
Warnings:
Warning 1105 plugin_dir was not specified
select IS_const(3);
IS_const(3)
const
@ -206,6 +210,8 @@ name ret dl type
select is_const(3);
ERROR 42000: FUNCTION test.is_const does not exist
CREATE FUNCTION is_const RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
Warnings:
Warning 1105 plugin_dir was not specified
select
is_const(3) as const,
is_const(3.14) as const,

20
mysys/my_symlink.c
View File

@ -2,7 +2,8 @@
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@ -106,24 +107,25 @@ int my_symlink(const char *content, const char *linkname, myf MyFlags)
#define BUFF_LEN FN_LEN
#endif
int my_is_symlink(const char *filename __attribute__((unused)))
{
struct stat stat_buff;
return !lstat(filename, &stat_buff) && S_ISLNK(stat_buff.st_mode);
}
int my_realpath(char *to, const char *filename,
myf MyFlags __attribute__((unused)))
{
#if defined(HAVE_REALPATH) && !defined(HAVE_purify) && !defined(HAVE_BROKEN_REALPATH)
int result=0;
char buff[BUFF_LEN];
struct stat stat_buff;
char *ptr;
DBUG_ENTER("my_realpath");
if (!(MyFlags & MY_RESOLVE_LINK) ||
(!lstat(filename,&stat_buff) && S_ISLNK(stat_buff.st_mode)))
{
char *ptr;
DBUG_PRINT("info",("executing realpath"));
if ((ptr=realpath(filename,buff)))
{
strmake(to,ptr,FN_REFLEN-1);
}
else
{
/*
@ -138,10 +140,10 @@ int my_realpath(char *to, const char *filename,
my_load_path(to, filename, NullS);
result= -1;
}
}
DBUG_RETURN(result);
#else
my_load_path(to, filename, NullS);
return 0;
#endif
}