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riscv: mm: make EXECMEM_KPROBES writable without CONFIG_STRICT_MODULE_RWX

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When CONFIG_STRICT_MODULE_RWX is not set, execmem cannot create
temporary writable mappings for read-only executable pages. In this
case, the execmem ranges must already have writable permissions.

Currently EXECMEM_KPROBES unconditionally uses PAGE_KERNEL_READ_EXEC,
which causes kprobe instruction slot writes to trigger page faults
on systems where CONFIG_STRICT_MODULE_RWX is not enabled.

Fix this by using PAGE_KERNEL_EXEC when CONFIG_STRICT_MODULE_RWX
is not available.

Signed-off-by: Xiaofeng Yuan <xiaofengmian@163.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20260814082742.148403-2-xiaofengmian@163.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Xiaofeng Yuan 2026-08-31 19:11:22 -06:00 committed by Paul Walmsley
parent cee9395acd
commit bdc46e507b
1 changed files with 3 additions and 1 deletions
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4
arch/riscv/mm/init.c
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@ -1465,7 +1465,9 @@ struct execmem_info __init *execmem_arch_setup(void)
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_READ_EXEC,
.pgprot = IS_ENABLED(CONFIG_STRICT_MODULE_RWX) ?
PAGE_KERNEL_READ_EXEC :
PAGE_KERNEL_EXEC,
.alignment = 1,
},
[EXECMEM_BPF] = {