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| /openbmc/linux/fs/proc/ |
| H A D | base.c | 8b0db9db Sun Mar 13 14:49:23 CDT 2011 Stephen Wilson <wilsons@start.ca> proc: make check_mem_permission() return an mm_struct on success
This change allows us to take advantage of access_remote_vm(), which in turn
eliminates a security issue with the mem_write() implementation.
The previous implementation of mem_write() was insecure since the target task
could exec a setuid-root binary between the permission check and the actual
write. Holding a reference to the target mm_struct eliminates this
vulnerability.
Signed-off-by: Stephen Wilson <wilsons@start.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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