From: Roland McGrath Date: Wed, 8 Sep 2010 02:37:06 +0000 (-0700) Subject: execve: make responsive to SIGKILL with large arguments X-Git-Tag: v2.6.27.55~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=358b1c7959f05070c270c00bf2b1bcba8eb4b6b5;p=pandora-kernel.git execve: make responsive to SIGKILL with large arguments commit 9aea5a65aa7a1af9a4236dfaeb0088f1624f9919 upstream. An execve with a very large total of argument/environment strings can take a really long time in the execve system call. It runs uninterruptibly to count and copy all the strings. This change makes it abort the exec quickly if sent a SIGKILL. Note that this is the conservative change, to interrupt only for SIGKILL, by using fatal_signal_pending(). It would be perfectly correct semantics to let any signal interrupt the string-copying in execve, i.e. use signal_pending() instead of fatal_signal_pending(). We'll save that change for later, since it could have user-visible consequences, such as having a timer set too quickly make it so that an execve can never complete, though it always happened to work before. Signed-off-by: Roland McGrath Reviewed-by: KOSAKI Motohiro Cc: Chuck Ebbert Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed