* [PATCH] fix kmalloc bug in bpf_prog_alloc_no_stats
@ 2025-11-24 18:05 Hithashree Bojanala
2025-11-24 18:33 ` Matthew Wilcox
0 siblings, 1 reply; 2+ messages in thread
From: Hithashree Bojanala @ 2025-11-24 18:05 UTC (permalink / raw)
Cc: linux-kernel, linux-doc, Hithashri Bojanala
From: Hithashri Bojanala <bojanalahithashri@gmail.com>
fix https://syzkaller.appspot.com/bug?extid=d4264133b3e51212ea30
vmalloc doesnt support __GFP_ACCOUNT
---
kernel/bpf/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index d595fe512498..ffe2658ce165 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -263,7 +263,8 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
if (pages <= fp_old->pages)
return fp_old;
- fp = __vmalloc(size, gfp_flags);
+ /*vmalloc doesn't support __GFP_ACCOUNT, so strip it for the vmalloc call */
+ fp = __vmalloc(size, gfp_flags & ~__GFP_ACCOUNT);
if (fp) {
memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE);
fp->pages = pages;
--
2.47.0
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] fix kmalloc bug in bpf_prog_alloc_no_stats
2025-11-24 18:05 [PATCH] fix kmalloc bug in bpf_prog_alloc_no_stats Hithashree Bojanala
@ 2025-11-24 18:33 ` Matthew Wilcox
0 siblings, 0 replies; 2+ messages in thread
From: Matthew Wilcox @ 2025-11-24 18:33 UTC (permalink / raw)
To: Hithashree Bojanala; +Cc: linux-kernel, linux-doc
On Mon, Nov 24, 2025 at 01:05:20PM -0500, Hithashree Bojanala wrote:
> From: Hithashri Bojanala <bojanalahithashri@gmail.com>
>
> fix https://syzkaller.appspot.com/bug?extid=d4264133b3e51212ea30
> vmalloc doesnt support __GFP_ACCOUNT
NAK.
https://lore.kernel.org/linux-mm/20251117173530.43293-1-vishal.moola@gmail.com/
fixed this. Discussion here:
https://lore.kernel.org/linux-mm/aRXeK_C44xGb3ovg@milan/
^ permalink raw reply [flat|nested] 2+ messages in thread
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2025-11-24 18:33 ` Matthew Wilcox
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