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Eric W. Biederman e71b4e061c ptrace: Don't allow accessing an undumpable mm ... commit 84d77d3f06 upstream. It is the reasonable expectation that if an executable file is not readable there will be no way for a user without special privileges to read the file. This is enforced in ptrace_attach but if ptrace is already attached before exec there is no enforcement for read-only executables. As the only way to read such an mm is through access_process_vm spin a variant called ptrace_access_vm that will fail if the target process is not being ptraced by the current process, or the current process did not have sufficient privileges when ptracing began to read the target processes mm. In the ptrace implementations replace access_process_vm by ptrace_access_vm. There remain several ptrace sites that still use access_process_vm as they are reading the target executables instructions (for kernel consumption) or register stacks. As such it does not appear necessary to add a permission check to those calls. This bug has always existed in Linux. Fixes: v1.0 Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		6 years ago
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boot	blackfin: Ignore generated uImages	10 years ago
configs	bf609: enable soft switch gpio driver by default	8 years ago
include	blackfin: no access_ok() for __copy_{to,from}_user()	7 years ago
kernel	ptrace: Don't allow accessing an undumpable mm	6 years ago
lib	Blackfin: comment spelling s/divsor/divisor/	7 years ago
mach-bf518	blackfin: cleanup board files	9 years ago
mach-bf527	Input: ad7879 - move header to platform_data directory	7 years ago
mach-bf533	arch/blackfin/mach-bf533/boards/stamp.c: add linux/delay.h	8 years ago
mach-bf537	Linux 4.5	7 years ago
mach-bf538	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	7 years ago
mach-bf548	gpio: Include linux/gpio.h instead of asm/gpio.h	7 years ago
mach-bf561	Merge 4.8-rc5 into char-misc-next	7 years ago
mach-bf609	[media] ezkit/cobalt: drop unused op_656_range setting	7 years ago
mach-common	This is the bulk of GPIO changes for kernel v4.6:	7 years ago
mm	treewide: replace obsolete _refok by __ref	7 years ago
oprofile	…
Clear_BSD.txt	blackfin: license: Change ADI BSD license	11 years ago
Kconfig	blackfin: do away with ARCH_REQUIRE_GPIOLIB	7 years ago
Kconfig.debug	consolidate per-arch stack overflow debugging options	10 years ago
Makefile	blackfin: rename vmImage to uImage after we move to buildroot	10 years ago