diff options
| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-10-13 16:43:54 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-10-14 21:47:34 +1100 |
| commit | 3091f5fc5f1df7741ddf326561384e0997eca2a1 (patch) | |
| tree | 3e17c2810ec510cb4835f31cd9dba76b7329465a /arch | |
| parent | powerpc/perf: Fix cycles/instructions as PM_CYC/PM_INST_CMPL in power10 (diff) | |
| download | linux-dev-3091f5fc5f1df7741ddf326561384e0997eca2a1.tar.xz linux-dev-3091f5fc5f1df7741ddf326561384e0997eca2a1.zip | |
powerpc: Mark .opd section read-only
.opd section contains function descriptors used to locate
functions in the kernel. If someone is able to modify a
function descriptor he will be able to run arbitrary
kernel function instead of another.
To avoid that, move .opd section inside read-only memory.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3cd40b682fb6f75bb40947b55ca0bac20cb3f995.1634136222.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/vmlinux.lds.S | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index 40bdefe9caa7..18e42c74abdd 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -143,6 +143,12 @@ SECTIONS SOFT_MASK_TABLE(8) RESTART_TABLE(8) + .opd : AT(ADDR(.opd) - LOAD_OFFSET) { + __start_opd = .; + KEEP(*(.opd)) + __end_opd = .; + } + . = ALIGN(8); __stf_entry_barrier_fixup : AT(ADDR(__stf_entry_barrier_fixup) - LOAD_OFFSET) { __start___stf_entry_barrier_fixup = .; @@ -339,12 +345,6 @@ SECTIONS *(.branch_lt) } - .opd : AT(ADDR(.opd) - LOAD_OFFSET) { - __start_opd = .; - KEEP(*(.opd)) - __end_opd = .; - } - . = ALIGN(256); .got : AT(ADDR(.got) - LOAD_OFFSET) { __toc_start = .; |