6.14-stable review patch. If anyone has any objections, please let me know.
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From: Kees Cook kees@kernel.org
commit f7a35a3c36d1e36059c5654737d9bee3454f01a3 upstream.
Patch series "mm: vmalloc: Actually use the in-place vrealloc region".
This fixes a performance regression[1] with vrealloc()[1].
The refactoring to not build a new vmalloc region only actually worked when shrinking. Actually return the resized area when it grows. Ugh.
Link: https://lkml.kernel.org/r/20250515214217.619685-1-kees@kernel.org Fixes: a0309faf1cb0 ("mm: vmalloc: support more granular vrealloc() sizing") Signed-off-by: Kees Cook kees@kernel.org Reported-by: Shung-Hsi Yu shung-hsi.yu@suse.com Closes: https://lore.kernel.org/all/20250515-bpf-verifier-slowdown-vwo2meju4cgp2su5c... [1] Tested-by: Eduard Zingerman eddyz87@gmail.com Tested-by: Pawan Gupta pawan.kumar.gupta@linux.intel.com Tested-by: Shung-Hsi Yu shung-hsi.yu@suse.com Reviewed-by: "Uladzislau Rezki (Sony)" urezki@gmail.com Reviewed-by: Danilo Krummrich dakr@kernel.org Cc: "Erhard F." erhard_f@mailbox.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/vmalloc.c | 1 + 1 file changed, 1 insertion(+)
--- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -4115,6 +4115,7 @@ void *vrealloc_noprof(const void *p, siz if (want_init_on_alloc(flags)) memset((void *)p + old_size, 0, size - old_size); vm->requested_size = size; + return (void *)p; }
/* TODO: Grow the vm_area, i.e. allocate and map additional pages. */