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authorRoland McGrath <roland@redhat.com>2010-09-07 19:37:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-10 08:10:26 -0700
commit9aea5a65aa7a1af9a4236dfaeb0088f1624f9919 (patch)
treec0e36c74dc511912f59e207c70893dc6bd13b543 /arch/x86/kernel/tsc.c
parentexecve: improve interactivity with large arguments (diff)
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execve: make responsive to SIGKILL with large arguments
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 <roland@redhat.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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