UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2022-09-20 14:13:05 -07:00
parent 905889bc6c
commit 6dd142d901
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/coredump.c
View File

@ -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;
}