diff options
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index ae36bfa814e..51c82147795 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -5,13 +5,15 @@ config TRACE_IRQFLAGS_SUPPORT source "lib/Kconfig.debug" -config NONPROMISC_DEVMEM +config STRICT_DEVMEM bool "Filter access to /dev/mem" help - If this option is left off, you allow userspace access to all + If this option is left on, you allow userspace (root) access to all of memory, including kernel and userspace memory. Accidental access to this is obviously disastrous, but specific access can - be used by people debugging the kernel. + be used by people debugging the kernel. Note that with PAT support + enabled, even in this case there are restrictions on /dev/mem + use due to the cache aliasing requirements. If this option is switched on, the /dev/mem file only allows userspace access to PCI space and the BIOS code and data regions. |