fs: take i_mutex during prepare_binprm for set[ug]id executables

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commit 8b01fc86b9 upstream.

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>
Signed-off-by: Charles Williams <ciwillia@brocade.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jann Horn 2015-04-19 02:48:39 +02:00 • committed by Greg Kroah-Hartman

parent cc87bcf04c

commit de70236fbe

1 changed files with 48 additions and 28 deletions

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fs/exec.c

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