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Peter Zijlstra 24ec839c43 [PATCH] tty: ->signal->tty locking ... Fix the locking of signal->tty. Use ->sighand->siglock to protect ->signal->tty; this lock is already used by most other members of ->signal/->sighand. And unless we are 'current' or the tasklist_lock is held we need ->siglock to access ->signal anyway. (NOTE: sys_unshare() is broken wrt ->sighand locking rules) Note that tty_mutex is held over tty destruction, so while holding tty_mutex any tty pointer remains valid. Otherwise the lifetime of ttys are governed by their open file handles. This leaves some holes for tty access from signal->tty (or any other non file related tty access). It solves the tty SLAB scribbles we were seeing. (NOTE: the change from group_send_sig_info to __group_send_sig_info needs to be examined by someone familiar with the security framework, I think it is safe given the SEND_SIG_PRIV from other __group_send_sig_info invocations) [schwidefsky@de.ibm.com: 3270 fix] [akpm@osdl.org: various post-viro fixes] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Alan Cox <alan@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Roland McGrath <roland@redhat.com> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Jan Kara <jack@ucw.cz> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		18 years ago
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alpha	[PATCH] alpha: switch to pci_get API	18 years ago
arm	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	18 years ago
arm26	[PATCH] arm26: replace kmalloc+memset with kzalloc	18 years ago
avr32	[PATCH] Pass struct dev pointer to dma_cache_sync()	18 years ago
cris	[PATCH] mm: arch do_page_fault() vs in_atomic()	18 years ago
frv	[PATCH] initrd: remove unused false condition for initrd_start	18 years ago
h8300	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
i386	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
ia64	Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6	18 years ago
m32r	[PATCH] m32r: bootloader support for OPSPUT platform	18 years ago
m68k	[PATCH] m68k: replace kmalloc+memset with kzalloc	18 years ago
m68knommu	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
mips	[PATCH] Pass struct dev pointer to dma_cache_sync()	18 years ago
parisc	[PATCH] elf: Always define elf_addr_t in linux/elf.h	18 years ago
powerpc	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
ppc	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
s390	[PATCH] hotplug CPU: clean up hotcpu_notifier() use	18 years ago
sh	[PATCH] initrd: remove unused false condition for initrd_start	18 years ago
sh64	[PATCH] initrd: remove unused false condition for initrd_start	18 years ago
sparc	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
sparc64	[PATCH] tty: ->signal->tty locking	18 years ago
um	[PATCH] tty: ->signal->tty locking	18 years ago
v850	[PATCH] relocatable kernel: Kallsyms generate relocatable symbols	18 years ago
x86_64	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
xtensa	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago