This patch series does not do kernel signature verification yet. I plan to post another patch series for that. Now distributions are already signing PE/COFF bzImage with PKCS7 signature I plan to parse and verify those signatures. Primary goal of this patchset is to prepare groundwork so that kernel image can be signed and signatures be verified during kexec load. This should help with two things. - It should allow kexec/kdump on secureboot enabled machines. - In general it can help even without secureboot. By being able to verify kernel image signature in kexec, it should help with avoiding module signing restrictions. Matthew Garret showed how to boot into a custom kernel, modify first kernel's memory and then jump back to old kernel and bypass any policy one wants to. This patch (of 15): Kexec wants to use bin2c and it wants to use it really early in the build process. See arch/x86/purgatory/ code in later patches. So move bin2c in scripts/basic so that it can be built very early and be usable by arch/x86/purgatory/
Showing the changes to scripts/basic (3 of 6 files). Show all
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| @@ -1 +1,2 @@ | ||
| 1 | 1 | fixdep |
| 2 | +bin2c | |
| @@ -9,6 +9,7 @@ · 8 unmodified lines | ||
| 9 | 9 | # fixdep: Used to generate dependency information during build process |
| 10 | 10 | |
| 11 | 11 | hostprogs-y := fixdep |
| 12 | +hostprogs-$(CONFIG_IKCONFIG) += bin2c | |
| 12 | 13 | always := $(hostprogs-y) |
| 13 | 14 | |
| 14 | 15 | # fixdep is needed to compile other host programs |
| @@ -0,0 +1,35 @@ | ||
| 1 | +/* | |
| 2 | + * Unloved program to convert a binary on stdin to a C include on stdout | |
| 3 | + * | |
| 4 | + * Jan 1999 Matt Mackall <mpm@selenic.com> | |
| 5 | + * | |
| 6 | + * This software may be used and distributed according to the terms | |
| 7 | + * of the GNU General Public License, incorporated herein by reference. | |
| 8 | + */ | |
| 9 | + | |
| 10 | +#include <stdio.h> | |
| 11 | + | |
| 12 | +int main(int argc, char *argv[]) | |
| 13 | +{ | |
| 14 | + int ch, total = 0; | |
| 15 | + | |
| 16 | + if (argc > 1) | |
| 17 | + printf("const char %s[] %s=\n", | |
| 18 | + argv[1], argc > 2 ? argv[2] : ""); | |
| 19 | + | |
| 20 | + do { | |
| 21 | + printf("\t\""); | |
| 22 | + while ((ch = getchar()) != EOF) { | |
| 23 | + total++; | |
| 24 | + printf("\\x%02x", ch); | |
| 25 | + if (total % 16 == 0) | |
| 26 | + break; | |
| 27 | + } | |
| 28 | + printf("\"\n"); | |
| 29 | + } while (ch != EOF); | |
| 30 | + | |
| 31 | + if (argc > 1) | |
| 32 | + printf("\t;\n\nconst int %s_size = %d;\n", argv[1], total); | |
| 33 | + | |
| 34 | + return 0; | |
| 35 | +} | |