diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2024-09-13 15:05:41 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2024-09-13 17:28:36 +0200 |
| commit | e10863fffe3a377a828f876a39cc1c47567b556f (patch) | |
| tree | d192b905c478eb1403a43c53ec7c9c1f88cfcb11 /arch/s390 | |
| parent | a919390e9194209bac163ec8e19520bdb3fb738b (diff) | |
s390/vdso: Allow alternatives in vdso code
Implement the infrastructure required to allow alternatives in vdso code.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/vdso.c | 19 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/vdso64.lds.S | 4 |
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index 2f967ac2b8e3..8e4e6b316337 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -12,12 +12,14 @@ #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/module.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/smp.h> #include <linux/time_namespace.h> #include <linux/random.h> #include <vdso/datapage.h> +#include <asm/alternative.h> #include <asm/vdso.h> extern char vdso64_start[], vdso64_end[]; @@ -250,8 +252,25 @@ static struct page ** __init vdso_setup_pages(void *start, void *end) return pagelist; } +static void vdso_apply_alternatives(void) +{ + const struct elf64_shdr *alt, *shdr; + struct alt_instr *start, *end; + const struct elf64_hdr *hdr; + + hdr = (struct elf64_hdr *)vdso64_start; + shdr = (void *)hdr + hdr->e_shoff; + alt = find_section(hdr, shdr, ".altinstructions"); + if (!alt) + return; + start = (void *)hdr + alt->sh_offset; + end = (void *)hdr + alt->sh_offset + alt->sh_size; + apply_alternatives(start, end); +} + static int __init vdso_init(void) { + vdso_apply_alternatives(); vdso64_mapping.pages = vdso_setup_pages(vdso64_start, vdso64_end); if (IS_ENABLED(CONFIG_COMPAT)) vdso32_mapping.pages = vdso_setup_pages(vdso32_start, vdso32_end); diff --git a/arch/s390/kernel/vdso64/vdso64.lds.S b/arch/s390/kernel/vdso64/vdso64.lds.S index 37e2a505e81d..fa02c6ae3cac 100644 --- a/arch/s390/kernel/vdso64/vdso64.lds.S +++ b/arch/s390/kernel/vdso64/vdso64.lds.S @@ -42,6 +42,10 @@ SECTIONS .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } .rodata1 : { *(.rodata1) } + . = ALIGN(8); + .altinstructions : { *(.altinstructions) } + .altinstr_replacement : { *(.altinstr_replacement) } + .dynamic : { *(.dynamic) } :text :dynamic .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr |