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Date: Tue, 18 Oct 2022 02:07:05 -0700 From: Kees Cook <keescook@...omium.org> To: Al Viro <viro@...iv.linux.org.uk> Cc: Kees Cook <keescook@...omium.org>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] coredump: Proactively round up to kmalloc bucket size Instead of discovering the kmalloc bucket size _after_ allocation, round up proactively so the allocation is explicitly made for the full size, allowing the compiler to correctly reason about the resulting size of the buffer through the existing __alloc_size() hint. Cc: Alexander Viro <viro@...iv.linux.org.uk> Cc: linux-fsdevel@...r.kernel.org Signed-off-by: Kees Cook <keescook@...omium.org> --- fs/coredump.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/coredump.c b/fs/coredump.c index 7bad7785e8e6..97eaee325251 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -68,7 +68,10 @@ struct core_name { static int expand_corename(struct core_name *cn, int size) { - char *corename = krealloc(cn->corename, size, GFP_KERNEL); + char *corename; + + size = kmalloc_size_roundup(size); + corename = krealloc(cn->corename, size, GFP_KERNEL); if (!corename) return -ENOMEM; @@ -76,7 +79,7 @@ static int expand_corename(struct core_name *cn, int size) if (size > core_name_size) /* racy but harmless */ core_name_size = size; - cn->size = ksize(corename); + cn->size = size; cn->corename = corename; return 0; } -- 2.34.1
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