Date: Mon, 16 Oct 2017 12:27:43 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Cc: Minqiang Chen <ptpt52@...il.com> Subject: Re: [PATCH v1] mman: fix mmap pass wrong offset to kernel On Mon, Oct 16, 2017 at 01:03:18PM +0200, Szabolcs Nagy wrote: > * Minqiang Chen <ptpt52@...il.com> [2017-10-16 09:09:32 +0800]: > > > > musl: fix mmap pass wrong offset to kernel > > > > > > > > for example off_t x=0x8d9eb000, the x/4096 result is 0xfff8d9eb, > > not 0x8d9eb as expecting > > > > off_t is 64bit, not 32bit, so x/4096 should not signextend. > you need to investigate this problem more. I suspect the calling code stored the offset 0x8d9eb000 in a signed 32-bit variable (converting it to a negative value) and then passed the resulting negative value to mmap. Rich
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