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Commit d11cf326 authored by Zhang Yanmin's avatar Zhang Yanmin Committed by Tony Luck
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[IA64] sys_mmap doesn't follow posix.1 when parameter len=0 



In IA64 kernel, sys_mmap calls do_mmap2 and do_mmap2 returns addr if
len=0, which means the mmap sys call succeeds.

Posix.1 says:
The mmap() function shall fail if:
[EINVAL] The value of len is zero. 

Here is a patch to fix it.

Signed-off-by: default avatarZhang Yanmin <yanmin.zhang@intel.com>
Acked-by: default avatarDavid Mosberger <davidm@hpl.hp.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent fe12e25e

arch/ia64/kernel/sys_ia64.c

+0 −7
Original line number Diff line number Diff line
@@ -182,13 +182,6 @@ do_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, un 
		}

	}



	/*

	 * A zero mmap always succeeds in Linux, independent of whether or not the

	 * remaining arguments are valid.

	 */

	if (len == 0)

		goto out;



	/* Careful about overflows.. */

	len = PAGE_ALIGN(len);

	if (!len || len > TASK_SIZE) {