From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Wed, 14 Dec 2016 23:04:14 +0000 (-0800)
Subject: coredump: clarify "unsafe core_pattern" warning
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=760c6a9139c37e16502362b22656d0cc4e840e8f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

coredump: clarify "unsafe core_pattern" warning

I was amused to find "unsafe core_pattern" warning having these lines in
/etc/sysctl.conf:

	fs.suid_dumpable=2
	kernel.core_pattern=/core/core-%e-%p-%E
	kernel.core_uses_pid=0

Turns out kernel is formally right.  Default core_pattern is just "core",
which doesn't qualify for secure path while setting suid.dumpable.

Hint admins about solution, clarify sysctl names, delete unnecessary '\'
characters (string literals are concatenated regardless) and reformat for
easier grepping.

Link: http://lkml.kernel.org/r/20161029152124.GA1258@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 39b3368f6de6..1475d2545b7e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2389,9 +2389,11 @@ static void validate_coredump_safety(void)
 #ifdef CONFIG_COREDUMP
 	if (suid_dumpable == SUID_DUMP_ROOT &&
 	    core_pattern[0] != '/' && core_pattern[0] != '|') {
-		printk(KERN_WARNING "Unsafe core_pattern used with "\
-			"suid_dumpable=2. Pipe handler or fully qualified "\
-			"core dump path required.\n");
+		printk(KERN_WARNING
+"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
+"Pipe handler or fully qualified core dump path required.\n"
+"Set kernel.core_pattern before fs.suid_dumpable.\n"
+		);
 	}
 #endif
 }