[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] x86: move both exception tables into .rodata
While they are being written during early boot (when sorting them), that writing takes place before we actually start fiddling with page table permissions, so these tables can benefit from getting write protected just like ordinary r/o data does (for now only when using 2M mappings). Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- a/xen/arch/x86/xen.lds.S +++ b/xen/arch/x86/xen.lds.S @@ -73,6 +73,17 @@ SECTIONS *(.rodata) *(.rodata.*) + . = ALIGN(8); + /* Exception table */ + __start___ex_table = .; + *(.ex_table) + __stop___ex_table = .; + + /* Pre-exception table */ + __start___pre_ex_table = .; + *(.ex_table.pre) + __stop___pre_ex_table = .; + #ifdef LOCK_PROFILE . = ALIGN(POINTER_ALIGN); __lock_profile_start = .; @@ -154,16 +165,6 @@ SECTIONS __2M_rwdata_start = .; /* Start of 2M superpages, mapped RW. */ . = ALIGN(SMP_CACHE_BYTES); .data.read_mostly : { - /* Exception table */ - __start___ex_table = .; - *(.ex_table) - __stop___ex_table = .; - - /* Pre-exception table */ - __start___pre_ex_table = .; - *(.ex_table.pre) - __stop___pre_ex_table = .; - *(.data.read_mostly) . = ALIGN(8); __start_schedulers_array = .; Attachment:
x86-extable-rodata.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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