linux-kernel - Re: [PATCH] tools/nolibc/stdlib: fix memory error in realloc()

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Date: Wed, 10 Jan 2024 07:17:52 +0100
From: Willy Tarreau <w@....eu>
To: Ammar Faizi <ammarfaizi2@...weeb.org>
Cc: Brennan Xavier McManus <bxmcmanus@...il.com>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tools/nolibc/stdlib: fix memory error in realloc()

Hi,

On Wed, Jan 10, 2024 at 11:11:37AM +0700, Ammar Faizi wrote:
> On Tue, Jan 09, 2024 at 06:44:02PM -0500, Brennan Xavier McManus wrote:
> > Pass user_p_len to memcpy() instead of heap->len to prevent realloc()
> > from copying an extra sizeof(heap) bytes from beyond the allocated
> > region.
> > 
> > Signed-off-by: Brennan Xavier McManus <bxmcmanus@...il.com>
> > ---
> > 
> > All tests from Ammar's original test program pass:
> > https://gist.github.com/ammarfaizi2/db0af6aa0b95a0c7478bce64e349f021
> > This fix was tested with the following added test for realloc():
> > https://github.com/brennan913/nolibc-test/blob/main/nolibc_test.c#L73-L120
> 
> Hello Brennan,
> 
> Thank you for the fix!
> 
> Cc: stable@...r.kernel.org
> Reviewed-by: Ammar Faizi <ammarfaizi2@...weeb.org>
> Fixes: 0e0ff638400be8f497a35b51a4751fd823f6bd6a ("tools/nolibc/stdlib: Implement `malloc()`, `calloc()`, `realloc()` and `free()`")

Thanks both for the fix and the review! I've pushed it to the "fixes"
branch. Thomas, for now I updated the branch to match "next" (which just
got merged) so as to preserve patch ordering, we'll just rebase it once
6.8-rc1 is out.

Willy