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...f > + > /* > * Generic compiler-dependent macros required for kernel > * build go below this comment. Actual compiler/compiler version > diff --git a/init/Kconfig b/init/Kconfig > index ccb1d8daf241..b640201fcff7 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1649,6 +1649,13 @@ config PROFILING > config TRACEPOINTS > bool > > +# > +# Default to hidden visibility for all symbols. > +# Useful for Position Independent Code to reduce global references. > +# > +config DEFAULT_HIDDEN > + bool Note it is default. Has 0-day ran thro...

...f > + > /* > * Generic compiler-dependent macros required for kernel > * build go below this comment. Actual compiler/compiler version > diff --git a/init/Kconfig b/init/Kconfig > index ccb1d8daf241..b640201fcff7 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1649,6 +1649,13 @@ config PROFILING > config TRACEPOINTS > bool > > +# > +# Default to hidden visibility for all symbols. > +# Useful for Position Independent Code to reduce global references. > +# > +config DEFAULT_HIDDEN > + bool Note it is default. Has 0-day ran thro...

...* Generic compiler-dependent macros required for kernel >> * build go below this comment. Actual compiler/compiler version >> diff --git a/init/Kconfig b/init/Kconfig >> index ccb1d8daf241..b640201fcff7 100644 >> --- a/init/Kconfig >> +++ b/init/Kconfig >> @@ -1649,6 +1649,13 @@ config PROFILING >> config TRACEPOINTS >> bool >> >> +# >> +# Default to hidden visibility for all symbols. >> +# Useful for Position Independent Code to reduce global references. >> +# >> +config DEFAULT_HIDDEN >> + boo...

...) +#else +#define __default_visibility +#endif + /* * Generic compiler-dependent macros required for kernel * build go below this comment. Actual compiler/compiler version diff --git a/init/Kconfig b/init/Kconfig index ccb1d8daf241..b640201fcff7 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1649,6 +1649,13 @@ config PROFILING config TRACEPOINTS bool +# +# Default to hidden visibility for all symbols. +# Useful for Position Independent Code to reduce global references. +# +config DEFAULT_HIDDEN + bool + source "arch/Kconfig" endmenu # General setup diff --git a/kernel/ka...

Changes: - patch v1: - Simplify ftrace implementation. - Use gcc mstack-protector-guard-reg=%gs with PIE when possible. - rfc v3: - Use --emit-relocs instead of -pie to reduce dynamic relocation space on mapped memory. It also simplifies the relocation process. - Move the start the module section next to the kernel. Remove the need for -mcmodel=large on modules. Extends

Changes: - patch v1: - Simplify ftrace implementation. - Use gcc mstack-protector-guard-reg=%gs with PIE when possible. - rfc v3: - Use --emit-relocs instead of -pie to reduce dynamic relocation space on mapped memory. It also simplifies the relocation process. - Move the start the module section next to the kernel. Remove the need for -mcmodel=large on modules. Extends

These patches make the changes necessary to build the kernel as Position Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below the top 2G of the virtual address space. It allows to optionally extend the KASLR randomization range from 1G to 3G. Thanks a lot to Ard Biesheuvel & Kees Cook on their feedback on compiler changes, PIE support and KASLR in general. Thanks to

These patches make the changes necessary to build the kernel as Position Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below the top 2G of the virtual address space. It allows to optionally extend the KASLR randomization range from 1G to 3G. Thanks a lot to Ard Biesheuvel & Kees Cook on their feedback on compiler changes, PIE support and KASLR in general. Thanks to