Thread (15 messages) 15 messages, 6 authors, 2023-11-30

Re: [PATCH 1/2] kexec: fix KEXEC_FILE dependencies

From: Baoquan He <bhe@redhat.com>
Date: 2023-10-24 12:45:34
Also in: kexec, linux-crypto, linux-riscv, linux-s390, lkml

Just add people and mailing list to CC since I didn't find this mail in
my box, just drag it via 'b4 am'.

On 10/23/23 at 01:01pm, Arnd Bergmann wrote:
......
quoted hunk ↗ jump to hunk
---
 arch/powerpc/Kconfig | 4 ++--
 arch/riscv/Kconfig   | 4 +---
 arch/s390/Kconfig    | 4 ++--
 arch/x86/Kconfig     | 4 ++--
 kernel/Kconfig.kexec | 1 +
 5 files changed, 8 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d5d5388973ac7..4640cee33f123 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -607,10 +607,10 @@ config ARCH_SUPPORTS_KEXEC
 	def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)
 
 config ARCH_SUPPORTS_KEXEC_FILE
-	def_bool PPC64 && CRYPTO=y && CRYPTO_SHA256=y
+	def_bool PPC64
 
 config ARCH_SUPPORTS_KEXEC_PURGATORY
-	def_bool KEXEC_FILE
+	def_bool y
 
 config ARCH_SELECTS_KEXEC_FILE
 	def_bool y
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 25474f8c12b79..f571bad2d22d0 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -687,9 +687,7 @@ config ARCH_SELECTS_KEXEC_FILE
 	select KEXEC_ELF
 
 config ARCH_SUPPORTS_KEXEC_PURGATORY
-	def_bool KEXEC_FILE
-	depends on CRYPTO=y
-	depends on CRYPTO_SHA256=y
+	def_bool y
 
 config ARCH_SUPPORTS_CRASH_DUMP
 	def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b0d67ac8695f9..ec77106af4137 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -253,13 +253,13 @@ config ARCH_SUPPORTS_KEXEC
 	def_bool y
 
 config ARCH_SUPPORTS_KEXEC_FILE
-	def_bool CRYPTO && CRYPTO_SHA256 && CRYPTO_SHA256_S390
+	def_bool y
 
 config ARCH_SUPPORTS_KEXEC_SIG
 	def_bool MODULE_SIG_FORMAT
 
 config ARCH_SUPPORTS_KEXEC_PURGATORY
-	def_bool KEXEC_FILE
+	def_bool y
 
 config ARCH_SUPPORTS_CRASH_DUMP
 	def_bool y
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 94efde80ebf35..f9975b15ccd57 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2073,7 +2073,7 @@ config ARCH_SUPPORTS_KEXEC
 	def_bool y
 
 config ARCH_SUPPORTS_KEXEC_FILE
-	def_bool X86_64 && CRYPTO && CRYPTO_SHA256
+	def_bool X86_64
 
 config ARCH_SELECTS_KEXEC_FILE
 	def_bool y
@@ -2081,7 +2081,7 @@ config ARCH_SELECTS_KEXEC_FILE
 	select HAVE_IMA_KEXEC if IMA
 
 config ARCH_SUPPORTS_KEXEC_PURGATORY
-	def_bool KEXEC_FILE
+	def_bool y
 
 config ARCH_SUPPORTS_KEXEC_SIG
 	def_bool y
diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 7aff28ded2f48..bfc636d64ff2b 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -36,6 +36,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "Enable kexec file based system call"
 	depends on ARCH_SUPPORTS_KEXEC_FILE
+	depends on CRYPTO_SHA256=y || !ARCH_SUPPORTS_KEXEC_PURGATORY
I am not sure if the logic is correct. In theory, kexec_file code
utilizes purgatory to verify the checksum digested during kernel loading
when try to jump to the kernel. That means kexec_file depends on
purgatory, but not contrary?

With these changes, we can achieve the goal to avoid building issue,
whereas the code logic becomes confusing. E.g people could disable
CONFIG_KEXEC_FILE, but still get purgatory code built in which is
totally useless.

Not sure if I think too much over this.
 	select KEXEC_CORE
 	help
 	  This is new version of kexec system call. This system call is
-- 
2.39.2
  
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