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Message-ID: <20260421075727.164197-1-florian.schmaus@codasip.com>
Date: Tue, 21 Apr 2026 09:57:27 +0200
From: Florian Schmaus <florian.schmaus@...asip.com>
To: musl@...ts.openwall.com
Cc: Florian Schmaus <florian.schmaus@...asip.com>
Subject: [PATCH] dynlink: set errno in case mprotect() fails
The format string of the error message uses %m to print the value of
errno in human-readable form. But the low-level __syscall() macro,
used to invoke mprotect(), will not implicitly set errno. Fix this by
setting errno explicitly before emitting the error message.
---
ldso/dynlink.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 715948f4f8b3..db0f9f52461c 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -1424,6 +1424,7 @@ static void reloc_all(struct dso *p)
long ret = __syscall(SYS_mprotect, laddr(p, p->relro_start),
p->relro_end-p->relro_start, PROT_READ);
if (ret != 0 && ret != -ENOSYS) {
+ errno = -ret;
error("Error relocating %s: RELRO protection failed: %m",
p->name);
if (runtime) longjmp(*rtld_fail, 1);
--
2.53.0
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