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-erro... and later at https://ozlabs.org/~akpm/mmotm/broken-out/mm-mremap-fix-sign-for-efault-erro...
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------------------------------------------------------ From: Niels Dossche dossche.niels@gmail.com 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@gmail.com Fixes: 550a7d60bd5e ("mm, hugepages: add mremap() support for hugepage backed vma") Signed-off-by: Niels Dossche dossche.niels@gmail.com Cc: Mina Almasry almasrymina@google.com Cc: Mike Kravetz mike.kravetz@oracle.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
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; }
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Patches currently in -mm which might be from dossche.niels@gmail.com are
mm-mremap-fix-sign-for-efault-error-return-value.patch