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linux-user/mmap.c: handle invalid len maps correctly 

I've slightly re-organised the check to more closely match the
sequence that the kernel uses in do_mmap(). We check for both the zero
case (EINVAL) and the overflow length case (ENOMEM).

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: umarcor <1783362@bugs.launchpad.net>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180730134321.19898-2-alex.bennee@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Alex Bennée 2018-07-30 14:43:20 +01:00 committed by Laurent Vivier
parent 6d9dd5fb9d
commit 38138fab93
1 changed files with 12 additions and 3 deletions
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15
linux-user/mmap.c
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@ -391,14 +391,23 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
}
#endif
if (!len) {
errno = EINVAL;
goto fail;
}
/* Also check for overflows... */
len = TARGET_PAGE_ALIGN(len);
if (!len) {
errno = ENOMEM;
goto fail;
}
if (offset & ~TARGET_PAGE_MASK) {
errno = EINVAL;
goto fail;
}
len = TARGET_PAGE_ALIGN(len);
if (len == 0)
goto the_end;
real_start = start & qemu_host_page_mask;
host_offset = offset & qemu_host_page_mask;