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linux system hangs while accessing encrypted files


I am trying to access folder which is encrypted by our product.

system is getting hang whenever we try to create new file under encrypted directory.

P.S - folder is encrypted by our own stackable file system which act as interceptor between vfs  and actual file system(ext4)

System Details -

Linux rhel67 2.6.32-573.8.1.el6.x86_64

Mcafee version -1.9.0

following is the call trace of our scenario:

Call Trace :

[<ffffffff8113e5d0>] ? __lru_cache_add+0x40/0x90

[<ffffffff8114a089>] ? zone_statistics+0x99/0xc0

[<ffffffff8100bc0e>] ? apic_timer_interrupt+0xe/0x20

[<ffffffff81539ed6>] __mutex_lock_slowpath+0x96/0x210

[<ffffffff815399fb>] mutex_lock+0x2b/0x50

[<ffffffffa02ff77f>] openHook+0x16f/0x220 [linuxshield]

[<ffffffffa02d96b5>] invokeCallbacks+0x1c5/0x870 [lshook]

[<ffffffffa00aea40>] ? ext4_release_file+0x0/0xd0 [ext4]

[<ffffffffa02da9d1>] fileOpenHook+0x101/0x1c0 [lshook]

[<ffffffffa02da8d0>] ? fileOpenHook+0x0/0x1c0 [lshook]

[<ffffffff8118eaa2>] __dentry_open+0x122/0x380

[<ffffffff81239b86>] ? selinux_file_alloc_security+0x46/0x70

[<ffffffff8118ed52>] dentry_open+0x52/0xc0

[<ffffffffa029dc76>] ifs_init_internal_file+0xb6/0x150 [safenetfs]

[<ffffffffa029ecaa>] ifs_open+0x1ca/0x830 [safenetfs]

[<ffffffffa029eae0>] ? ifs_open+0x0/0x830 [safenetfs]

[<ffffffff8118eaa2>] __dentry_open+0x122/0x380

[<ffffffff8123ada2>] ? selinux_inode_permission+0x72/0xb0

[<ffffffff8123284f>] ? security_inode_permission+0x1f/0x30

[<ffffffff8118ee14>] nameidata_to_filp+0x54/0x70

[<ffffffff811a4c80>] do_filp_open+0x6d0/0xd20

[<ffffffff8129dc3a>] ? strncpy_from_user+0x4a/0x90

[<ffffffff811b1d52>] ? alloc_fd+0x92/0x160

[<ffffffff8118e847>] do_sys_open+0x67/0x130

[<ffffffff8118e950>] sys_open+0x20/0x30

[<ffffffff8100b0d2>] system_call_fastpath+0x16/0x1b

We suspect that mcafee (lshook kernel module) is blocking file open command to our module.

Is there any way(config file settings  or whitelist etc ) through which we can directly bypass file operations calls.

Any suggestion/comments on this will be appreciated.

thanks -

1 Reply
Reliable Contributor exbrit
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Re: linux system hangs while accessing encrypted files

This is not a consumer product so have moved it to Business > Mac & Linux Products for better support.




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