diff options
| author | Kees Cook <[email protected]> | 2022-09-20 14:13:05 -0700 |
|---|---|---|
| committer | Kees Cook <[email protected]> | 2022-11-01 10:04:52 -0700 |
| commit | 6dd142d9013ca82155d0c069434c60a0d5755ec0 (patch) | |
| tree | 730fa60fa3d9fde0b31ad8e9c5fc9d8ad3788545 | |
| parent | 905889bc6c842d18f369bf2834cf7219f32709ae (diff) | |
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 <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
| -rw-r--r-- | fs/coredump.c | 7 |
1 files 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; } |