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ipc/shm: introduce new do_vma_munmap() to munmap

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The shm already has the vma iterator in position for a write. 
do_vmi_munmap() searches for the correct position and aligns the write, so
it is not the right function to use in this case.

The shm VMA tree modification is similar to the brk munmap situation, the
vma iterator is in position and the VMA is already known.  This patch
generalizes the brk munmap function do_brk_munmap() to be used for any
other callers with the vma iterator already in position to munmap a VMA.

Link: https://lkml.kernel.org/r/20230126212049.980501-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Sven Schnelle <svens@linux.ibm.com>
  Link: https://lore.kernel.org/linux-mm/yt9dh6wec21a.fsf@linux.ibm.com/
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett
2023-01-26 16:20:49 -05:00
committed by Andrew Morton
parent d60beb1f69
commit 27b2670112
3 changed files with 27 additions and 25 deletions
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11
ipc/shm.c
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@@ -1786,8 +1786,8 @@ long ksys_shmdt(char __user *shmaddr)
*/
file = vma->vm_file;
size = i_size_read(file_inode(vma->vm_file));
do_vmi_munmap(&vmi, mm, vma->vm_start,
vma->vm_end - vma->vm_start, NULL, false);
do_vma_munmap(&vmi, vma, vma->vm_start, vma->vm_end,
NULL, false);
/*
* We discovered the size of the shm segment, so
* break out of here and fall through to the next
@@ -1810,9 +1810,10 @@ long ksys_shmdt(char __user *shmaddr)
/* finding a matching vma now does not alter retval */
if ((vma->vm_ops == &shm_vm_ops) &&
((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) &&
(vma->vm_file == file))
do_vmi_munmap(&vmi, mm, vma->vm_start,
vma->vm_end - vma->vm_start, NULL, false);
(vma->vm_file == file)) {
do_vma_munmap(&vmi, vma, vma->vm_start, vma->vm_end,
NULL, false);
}
vma = vma_next(&vmi);
}