The patch titled
Subject: mm: mremap: fix sign for EFAULT error return value
has been added to the -mm tree. Its filename is
mm-mremap-fix-sign-for-efault-error-return-value.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-mremap-fix-sign-for-efault-error-return-value.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-mremap-fix-sign-for-efault-error-return-value.patch
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------------------------------------------------------
From: Niels Dossche <dossche.niels@xxxxxxxxx>
Subject: mm: mremap: fix sign for EFAULT error return value
The mremap syscall is supposed to return a pointer to the new virtual
memory area on success, and a negative value of the error code in case of
failure. Currently, EFAULT is returned when the VMA is not found, instead
of -EFAULT. The users of this syscall will therefore believe the syscall
succeeded in case the VMA didn't exist, as it returns a pointer to address
0xe (0xe being the value of EFAULT). Fix the sign of the error value.
Link: https://lkml.kernel.org/r/20220427224439.23828-2-dossche.niels@xxxxxxxxx
Fixes: 550a7d60bd5e ("mm, hugepages: add mremap() support for hugepage backed vma")
Signed-off-by: Niels Dossche <dossche.niels@xxxxxxxxx>
Cc: Mina Almasry <almasrymina@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mremap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/mremap.c~mm-mremap-fix-sign-for-efault-error-return-value
+++ a/mm/mremap.c
@@ -941,7 +941,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, a
return -EINTR;
vma = vma_lookup(mm, addr);
if (!vma) {
- ret = EFAULT;
+ ret = -EFAULT;
goto out;
}
_
Patches currently in -mm which might be from dossche.niels@xxxxxxxxx are
mm-mremap-fix-sign-for-efault-error-return-value.patch
