Jann Horn 8b01fc86b9 fs: take i_mutex during prepare_binprm for set[ug]id executables ...

This prevents a race between chown() and execve(), where chowning a
setuid-user binary to root would momentarily make the binary setuid
root.

This patch was mostly written by Linus Torvalds.

Signed-off-by: Jann Horn <jann@thejh.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2015-04-19 13:46:21 -07:00

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