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authorChristopher M. Riedl <cmr@informatik.wtf>2019-04-16 06:26:38 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2019-05-02 19:54:57 +0300
commit0acb5f64560a052fd66ab37b212a72964847160f (patch)
tree51ab809e5bc5f343e540f4496d2c7af8a60e9847 /arch/powerpc/Kconfig.debug
parent5d085ec04a000fefb5182d3b03ee46ca96d8389b (diff)
downloadlinux-0acb5f64560a052fd66ab37b212a72964847160f.tar.xz
powerpc/xmon: add read-only mode
Operations which write to memory and special purpose registers should be restricted on systems with integrity guarantees (such as Secure Boot) and, optionally, to avoid self-destructive behaviors. Add a config option, XMON_DEFAULT_RO_MODE, to set default xmon behavior. The kernel cmdline options xmon=ro and xmon=rw override this default. The following xmon operations are affected: memops: disable memmove disable memset disable memzcan memex: no-op'd mwrite super_regs: no-op'd write_spr bpt_cmds: disable proc_call: disable Signed-off-by: Christopher M. Riedl <cmr@informatik.wtf> Reviewed-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/Kconfig.debug')
-rw-r--r--arch/powerpc/Kconfig.debug8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index e9ae650c8e93..c59920920ddc 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -117,6 +117,14 @@ config XMON_DISASSEMBLY
to say Y here, unless you're building for a memory-constrained
system.
+config XMON_DEFAULT_RO_MODE
+ bool "Restrict xmon to read-only operations by default"
+ depends on XMON
+ default y
+ help
+ Operate xmon in read-only mode. The cmdline options 'xmon=rw' and
+ 'xmon=ro' override this default.
+
config DEBUGGER
bool
depends on KGDB || XMON