eac2a6c404
Refreshed patches for ramips/patches-6.18 by running make target/linux/refresh Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com> Link: https://github.com/openwrt/openwrt/pull/21418 Signed-off-by: Robert Marko <robimarko@gmail.com>
31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From: Mieczyslaw Nalewaj <namiltd@yahoo.com>
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Date: Sun, 26 Oct 2025 10:36:02 +0100
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Subject: [PATCH] mt7620: conditional stack align
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This patch avoids applying arch_align_stack() and PAGE_ALIGN() in the exec
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path on CONFIG_NET_RALINK_MT7620 builds. Many ports (including mt7620)
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implement only micro-randomization inside arch_align_stack() (random offset
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< PAGE_SIZE and then align-down to small alignment). Callers that immediately
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apply PAGE_ALIGN() will round that micro-offset back to the original page
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boundary, so invoking arch_align_stack() then PAGE_ALIGN() is pointless and
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can be avoided on the affected platform.
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Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
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---
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a/fs/exec.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/fs/exec.c
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+++ b/fs/exec.c
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@@ -632,8 +632,10 @@ int setup_arg_pages(struct linux_binprm
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mm->arg_start = bprm->p - stack_shift;
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bprm->p = vma->vm_end - stack_shift;
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#else
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+#ifndef CONFIG_NET_RALINK_MT7620
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stack_top = arch_align_stack(stack_top);
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stack_top = PAGE_ALIGN(stack_top);
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+#endif
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if (unlikely(stack_top < mmap_min_addr) ||
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unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr))
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