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Message-ID: <20240915213750.4853-1-ziyao@disroot.org>
Date: Sun, 15 Sep 2024 21:37:50 +0000
From: Yao Zi <ziyao@...root.org>
To: musl@...ts.openwall.com
Cc: Yao Zi <ziyao@...root.org>
Subject: [PATCH] ldso: don't reclaim zero-memory-sized segments
Some weird linkers may emit PT_LOAD segments with memsz = 0. ELF
specification does not forbid this, but such a segment with non-zero
p_vaddr will result in reclaiming of invalid memory address.
This patch skips such segments during reclaiming for better
compatibility.
Signed-off-by: Yao Zi <ziyao@...root.org>
---
ldso/dynlink.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 3b57c07f..715948f4 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -616,6 +616,7 @@ static void reclaim_gaps(struct dso *dso)
for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) {
if (ph->p_type!=PT_LOAD) continue;
if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
+ if (ph->p_memsz == 0) continue;
reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
reclaim(dso, ph->p_vaddr+ph->p_memsz,
ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
--
2.46.0
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