grsecurity forums

Hi,

I founded my apache crashes sometimes. Logs show this:

Code: Select all

Aug 10 06:26:16 alus kernel: PAX: bytes at PC: <invalid address>.
Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: execution attempt in: <NULL>, 00000000-00000000 00000000
Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: terminating task: /usr/sbin/apache(apache):22573, uid/euid: 33/33, PC: 00000001, SP: 5cfff600
Aug 10 06:26:16 alus kernel: PAX: bytes at PC: <invalid address>.
Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: execution attempt in: <NULL>, 00000000-00000000 00000000
Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: terminating task: /usr/sbin/apache(apache):22556, uid/euid: 33/33, PC: 00000001, SP: 5cfff600


How to solve this problem?

Thanks

polarfox wrote:

Code: Select all

Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: execution attempt in: <NULL>, 00000000-00000000 00000000
Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: terminating task: /usr/sbin/apache(apache):22573, uid/euid: 33/33, PC: 00000001, SP: 5cfff600

How to solve this problem?

apache is dereferencing a NULL function pointer. you could enable coredumping and analyze the coredump then we can tell more, otherwise it's hard to fix properly.

polarfox wrote:Hi,

I founded my apache crashes sometimes. Logs show this:

Code: Select all

Aug 10 06:26:16 alus kernel: PAX: bytes at PC: <invalid address>.
Aug 10 06:26:16 alus kernel: PAX: From x.x.x.x: execution attempt in: <NULL>, 00000000-00000000 00000000


It seems...I think so, the PaX protect your linux system from this problem ?

The fixed libpng is available in linux distributions.