Yann Droneaud a21b0b354d perf: Introduce a flag to enable close-on-exec in perf_event_open() ... Unlike recent modern userspace API such as: epoll_create1 (EPOLL_CLOEXEC), eventfd (EFD_CLOEXEC), fanotify_init (FAN_CLOEXEC), inotify_init1 (IN_CLOEXEC), signalfd (SFD_CLOEXEC), timerfd_create (TFD_CLOEXEC), or the venerable general purpose open (O_CLOEXEC), perf_event_open() syscall lack a flag to atomically set FD_CLOEXEC (eg. close-on-exec) flag on file descriptor it returns to userspace. The present patch adds a PERF_FLAG_FD_CLOEXEC flag to allow perf_event_open() syscall to atomically set close-on-exec. Having this flag will enable userspace to remove the file descriptor from the list of file descriptors being inherited across exec, without the need to call fcntl(fd, F_SETFD, FD_CLOEXEC) and the associated race condition between the current thread and another thread calling fork(2) then execve(2). Links: - Secure File Descriptor Handling (Ulrich Drepper, 2008) http://udrepper.livejournal.com/20407.html - Excuse me son, but your code is leaking !!! (Dan Walsh, March 2012) http://danwalsh.livejournal.com/53603.html - Notes in DMA buffer sharing: leak and security hole http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/dma-buf-sharing.txt?id=v3.13-rc3#n428 Signed-off-by: Yann Droneaud <ydroneaud@opteya.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/8c03f54e1598b1727c19706f3af03f98685d9fe6.1388952061.git.ydroneaud@opteya.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2014-01-12 10:16:59 +01:00
..
acpi	Merge branch 'acpica'	2013-11-27 01:03:27 +01:00
asm-generic	word-at-a-time: provide generic big-endian zero_bytemask implementation	2013-12-12 10:39:01 -08:00
clocksource
crypto	crypto: scatterwalk - Use sg_chain_ptr on chain entries	2013-12-09 19:58:52 +08:00
drm
dt-bindings
keys
kvm
linux	perf/x86: Fix active_entry initialization	2014-01-12 10:16:07 +01:00
math-emu
media	[media] videobuf2: Add support for file access mode flags for DMABUF exporting	2013-12-09 14:50:50 -02:00
memory
misc
net	sctp: properly latch and use autoclose value from sock to association	2013-12-10 22:41:26 -05:00
pcmcia
ras
rdma
rxrpc
scsi	[SCSI] Disable WRITE SAME for RAID and virtual host adapter drivers	2013-11-29 08:48:39 +04:00
sound	ALSA: memalloc.h - fix wrong truncation of dma_addr_t	2013-12-10 15:30:46 +01:00
target
trace	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-12-02 10:13:09 -08:00
uapi	perf: Introduce a flag to enable close-on-exec in perf_event_open()	2014-01-12 10:16:59 +01:00
video
xen
Kbuild