user/sven/linux.git/include/linux/kcore.h, branch v4.9.329Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v4.9.3292018-05-30T05:50:26Zvfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page2018-05-30T05:50:26ZJia Zhangzhang.jia@linux.alibaba.com2018-02-12T14:44:53Zurn:sha1:059befd4e0ae7ad7c54d5d292a3cb75b51ff4bf9
[ Upstream commit 595dd46ebfc10be041a365d0a3fa99df50b6ba73 ]
Commit:
df04abfd181a ("fs/proc/kcore.c: Add bounce buffer for ktext data")
... introduced a bounce buffer to work around CONFIG_HARDENED_USERCOPY=y.
However, accessing the vsyscall user page will cause an SMAP fault.
Replace memcpy() with copy_from_user() to fix this bug works, but adding
a common way to handle this sort of user page may be useful for future.
Currently, only vsyscall page requires KCORE_USER.
Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1518446694-21124-2-git-send-email-zhang.jia@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
proc: Split kcore bits from linux/procfs.h into linux/kcore.h2013-04-29T19:42:02ZDavid Howellsdhowells@redhat.com2013-04-11T23:10:25Zurn:sha1:2f96b8c1d5d492c1d0457b253015330f844136f6
Split kcore bits from linux/procfs.h into linux/kcore.h.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
cc: linux-mips@linux-mips.org
cc: sparclinux@vger.kernel.org
cc: x86@kernel.org
cc: linux-mm@kvack.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>