Re: [PATCH v3 4/4] mm: huge_memory: Use strscpy() instead of strcpy()

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Hi Barry,

On 30/10/24 20:07, Barry Song wrote:
On Thu, Oct 31, 2024 at 2:03 AM Maíra Canal <mcanal@xxxxxxxxxx> wrote:

Replace strcpy() with strscpy() in mm/huge_memory.c

strcpy() has been deprecated because it is generally unsafe, so help to
eliminate it from the kernel source.

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Maíra Canal <mcanal@xxxxxxxxxx>
---
  mm/huge_memory.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f92068864469..8f41a694433c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -989,7 +989,7 @@ static int __init setup_thp_anon(char *str)

         if (!str || strlen(str) + 1 > PAGE_SIZE)
                 goto err;
-       strcpy(str_dup, str);
+       strscpy(str_dup, str);

What is the difference between strcpy and strscpy without a size parameter?

we have already a check and goto err. strcpy() is entirely safe.
          if (!str || strlen(str) + 1 > PAGE_SIZE)
                  goto err;

My understanding is that we don't need this patch.

strcpy() is a deprecated interface [1]. From the GitHub issue I linked
in the commit description, Kees states: "A lot of kernel code is still
using strcpy(). While the CONFIG_FORTIFY_SOURCE wrapper macros tend to
make its use mostly safe, it would be nice to eliminate the function
from the kernel entirely."

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy

Best Regards,
- Maíra



         always = huge_anon_orders_always;
         madvise = huge_anon_orders_madvise;
@@ -4175,7 +4175,7 @@ static ssize_t split_huge_pages_write(struct file *file, const char __user *buf,

                 tok = strsep(&buf, ",");
                 if (tok) {
-                       strcpy(file_path, tok);
+                       strscpy(file_path, tok);
                 } else {
                         ret = -EINVAL;
                         goto out;
--
2.46.2


Thanks
barry





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