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riscv: use sysfs_emit in cpu_show_ghostwrite

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Replace sprintf() with sysfs_emit() in cpu_show_ghostwrite(), which is
preferred for formatting sysfs output because it provides safer bounds
checking.

While the current code only emits fixed strings that fit easily within
PAGE_SIZE, use sysfs_emit() to follow secure coding best practices.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20260510165420.109453-3-thorsten.blum@linux.dev
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Thorsten Blum 2026-06-06 20:17:52 -06:00 committed by Paul Walmsley
parent b954dba17b
commit 7d0dec57e5
1 changed files with 6 additions and 6 deletions
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12
arch/riscv/kernel/bugs.c
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@ -5,7 +5,7 @@
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/sprintf.h>
#include <linux/sysfs.h>
#include <asm/bugs.h>
#include <asm/vendor_extensions/thead.h>
@ -46,15 +46,15 @@ ssize_t cpu_show_ghostwrite(struct device *dev, struct device_attribute *attr, c
if (IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR)) {
switch (ghostwrite_state) {
case UNAFFECTED:
return sprintf(buf, "Not affected\n");
return sysfs_emit(buf, "Not affected\n");
case MITIGATED:
return sprintf(buf, "Mitigation: xtheadvector disabled\n");
return sysfs_emit(buf, "Mitigation: xtheadvector disabled\n");
case VULNERABLE:
fallthrough;
default:
return sprintf(buf, "Vulnerable\n");
return sysfs_emit(buf, "Vulnerable\n");
}
} else {
return sprintf(buf, "Not affected\n");
}
return sysfs_emit(buf, "Not affected\n");
}