From 5ccf05d86dacba0e6542ae1a6b6508a41cfe326e Mon Sep 17 00:00:00 2001 From: Yao Zi Date: Mon, 18 Nov 2024 03:44:47 +0000 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. --- 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);