linux

iv/linux

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Eric W. Biederman 8f072ec8b4 signal/sh: Use force_sig(SIGKILL) instead of do_group_exit(SIGKILL)

[ Upstream commit ce0ee4e6ac99606f3945f4d47775544edc3f7985 ]

Today the sh code allocates memory the first time a process uses
the fpu.  If that memory allocation fails, kill the affected task
with force_sig(SIGKILL) rather than do_group_exit(SIGKILL).

Calling do_group_exit from an exception handler can potentially lead
to dead locks as do_group_exit is not designed to be called from
interrupt context.  Instead use force_sig(SIGKILL) to kill the
userspace process.  Sending signals in general and force_sig in
particular has been tested from interrupt context so there should be
no problems.

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Fixes: 0ea820cf9bf5 ("sh: Move over to dynamically allocated FPU context.")
Link: https://lkml.kernel.org/r/20211020174406.17889-6-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2021-11-18 19:17:03 +01:00

boards

SH: Bulk conversion to generic_handle_domain_irq()

2021-08-12 11:39:40 +01:00

boot

sh: Add missing FORCE prerequisites in Makefile

2021-09-19 10:13:42 +09:00

cchips

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-14 01:57:21 +09:00

configs

drivers/char: remove /dev/kmem for good