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Date: Tue, 16 Nov 2021 11:56:57 +0800
From: "Minqiang Chen (ptpt52)" <ptpt52@...il.com>
To: musl@...ts.openwall.com
Subject: BUG fix: mmap pass wrong offset to kernel
From 146066a9794b8e39c53337b71a8476b86e79e7d4 Mon Sep 17 00:00:00 2001
From: Chen Minqiang <ptpt52@...il.com>
Date: Mon, 16 Oct 2017 08:57:41 +0800
Subject: [PATCH] musl: fix mmap pass wrong offset to kernel
on 32bit platform for example off_t x=0x8d9eb000, the x/4096 result
is 0xfff8d9eb, but the sys_mmap2() is expecting 0x8d9eb to be pass to
this happens on 32bit platform or 64bit platform when
x > = 0x80000000 (32bit platform)
or
x > = 0x8000000000000000 (64bit platform)
Signed-off-by: Chen Minqiang <ptpt52@...il.com>
---
src/mman/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index eff88d82..f225cdbb 100644
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -26,7 +26,7 @@ void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
__vm_wait();
}
#ifdef SYS_mmap2
- ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
+ ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, (unsigned long)off/UNIT);
#else
ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off);
#endif
--
2.17.1
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