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860ec7c6e2
the s390 debug feature (/sys/kernel/debug/s390dbf/) shows the kernel pointer of the calling function even for kptr_restrict == 2. Let us use pK instead of p. This hides the kernel addresses for kptr_restrict == 2: root@host $ echo 2 > /proc/sys/kernel/kptr_restrict root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf 00 01511461280:386645 2 - 00 0000000000000000 snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c root@host $ echo 1 > /proc/sys/kernel/kptr_restrict root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf 00 01511461280:386645 2 - 00 000000000071171c snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c root@host $ echo 0 > /proc/sys/kernel/kptr_restrict root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf 00 01511461280:386645 2 - 00 000000000071171c snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.