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Code Issues Releases Wiki Activity

powerpc/build: move got, toc, plt, branch_lt sections to read-only

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This moves linker-related tables from .data to read-only area.
Relocations are performed at early boot time before memory is protected,
after which there should be no modifications required.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Don't use SPECIAL as reported by lkp@intel.com]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916040755.2398112-4-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-09-16 14:07:51 +10:00 committed by Michael Ellerman
parent 1faa1235c1
commit f21ba4499a
1 changed files with 22 additions and 10 deletions
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32
arch/powerpc/kernel/vmlinux.lds.S
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@ -135,6 +135,10 @@ SECTIONS
/* Read-only data */
RO_DATA(PAGE_SIZE)
.branch_lt : AT(ADDR(.branch_lt) - LOAD_OFFSET) {
*(.branch_lt)
}
#ifdef CONFIG_PPC32
.got1 : AT(ADDR(.got1) - LOAD_OFFSET) {
*(.got1)
@ -144,7 +148,25 @@ SECTIONS
*(.got2)
__got2_end = .;
}
.got : AT(ADDR(.got) - LOAD_OFFSET) {
*(.got)
*(.got.plt)
}
.plt : AT(ADDR(.plt) - LOAD_OFFSET) {
/* XXX: is .plt (and .got.plt) required? */
*(.plt)
}
#else /* CONFIG_PPC32 */
.toc1 : AT(ADDR(.toc1) - LOAD_OFFSET) {
*(.toc1)
}
.got : AT(ADDR(.got) - LOAD_OFFSET) ALIGN(256) {
*(.got)
*(.toc)
}
SOFT_MASK_TABLE(8)
RESTART_TABLE(8)
@ -333,21 +355,11 @@ SECTIONS
*(.data.rel*)
*(SDATA_MAIN)
*(.sdata2)
*(.got.plt) *(.got)
*(.plt)
*(.branch_lt)
}
#else
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
*(.data.rel*)
*(.toc1)
*(.branch_lt)
}
.got : AT(ADDR(.got) - LOAD_OFFSET) ALIGN(256) {
*(.got)
*(.toc)
}
#endif