uprobes: Make copy_from_page global

Making copy_from_page global and adding uprobe prefix.
Adding the uprobe prefix to copy_to_page as well for symmetry.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20250720112133.244369-4-jolsa@kernel.org

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 01112f27cd2150866f1dc6e06b045fc1f67ecefe..7447e15559b861a6f5955d49c3f07f10784f7c26 100644 (file)
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -226,6 +226,7 @@ extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
 extern void uprobe_handle_trampoline(struct pt_regs *regs);
 extern void *arch_uretprobe_trampoline(unsigned long *psize);
 extern unsigned long uprobe_get_trampoline_vaddr(void);
+extern void uprobe_copy_from_page(struct page *page, unsigned long vaddr, void *dst, int len);
 #else /* !CONFIG_UPROBES */
 struct uprobes_state {
 };

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index dd4dd156c9567e4ca264ec92ac2aed9024eaf583..f993a3422083df2adf5750129ae127b601ed1e3e 100644 (file)
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -177,7 +177,7 @@ bool __weak is_trap_insn(uprobe_opcode_t *insn)
        return is_swbp_insn(insn);
 }
 
-static void copy_from_page(struct page *page, unsigned long vaddr, void *dst, int len)
+void uprobe_copy_from_page(struct page *page, unsigned long vaddr, void *dst, int len)
 {
        void *kaddr = kmap_atomic(page);
        memcpy(dst, kaddr + (vaddr & ~PAGE_MASK), len);
@@ -205,7 +205,7 @@ static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t
         * is a trap variant; uprobes always wins over any other (gdb)
         * breakpoint.
         */
-       copy_from_page(page, vaddr, &old_opcode, UPROBE_SWBP_INSN_SIZE);
+       uprobe_copy_from_page(page, vaddr, &old_opcode, UPROBE_SWBP_INSN_SIZE);
        is_swbp = is_swbp_insn(&old_opcode);
 
        if (is_swbp_insn(new_opcode)) {
@@ -1051,7 +1051,7 @@ static int __copy_insn(struct address_space *mapping, struct file *filp,
        if (IS_ERR(page))
                return PTR_ERR(page);
 
-       copy_from_page(page, offset, insn, nbytes);
+       uprobe_copy_from_page(page, offset, insn, nbytes);
        put_page(page);
 
        return 0;
@@ -1397,7 +1397,7 @@ struct uprobe *uprobe_register(struct inode *inode,
                return ERR_PTR(-EINVAL);
 
        /*
-        * This ensures that copy_from_page(), copy_to_page() and
+        * This ensures that uprobe_copy_from_page(), copy_to_page() and
         * __update_ref_ctr() can't cross page boundary.
         */
        if (!IS_ALIGNED(offset, UPROBE_SWBP_INSN_SIZE))
@@ -2393,7 +2393,7 @@ static int is_trap_at_addr(struct mm_struct *mm, unsigned long vaddr)
        if (result < 0)
                return result;
 
-       copy_from_page(page, vaddr, &opcode, UPROBE_SWBP_INSN_SIZE);
+       uprobe_copy_from_page(page, vaddr, &opcode, UPROBE_SWBP_INSN_SIZE);
        put_page(page);
  out:
        /* This needs to return true for any variant of the trap insn */