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Char/Misc fix for 5.4-rc5
This is a single char/misc driver fix (well, a binder fix to be specific) to resolve a reported issue by Jann. It's been in linux-next for a while with no reported issues. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCXbSKbg8cZ3JlZ0Brcm9h aC5jb20ACgkQMUfUDdst+yk6wwCgwkxF667WQcJ2Eh9nE/9ZvDvrmlwAn3q2VmZM 94K3nJrFLohNgTBJ4SHG =d8Af -----END PGP SIGNATURE----- Merge tag 'char-misc-5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull binder fix from Greg KH: "This is a single binder fix to resolve a reported issue by Jann. It's been in linux-next for a while with no reported issues" * tag 'char-misc-5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: binder: Don't modify VMA bounds in ->mmap handler
This commit is contained in:
commit
a03885d596
2 changed files with 4 additions and 9 deletions
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@ -97,10 +97,6 @@ DEFINE_SHOW_ATTRIBUTE(proc);
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#define SZ_1K 0x400
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#endif
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#ifndef SZ_4M
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#define SZ_4M 0x400000
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#endif
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#define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
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enum {
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@ -5177,9 +5173,6 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
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if (proc->tsk != current->group_leader)
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return -EINVAL;
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if ((vma->vm_end - vma->vm_start) > SZ_4M)
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vma->vm_end = vma->vm_start + SZ_4M;
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binder_debug(BINDER_DEBUG_OPEN_CLOSE,
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"%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
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__func__, proc->pid, vma->vm_start, vma->vm_end,
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@ -22,6 +22,7 @@
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#include <asm/cacheflush.h>
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#include <linux/uaccess.h>
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#include <linux/highmem.h>
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#include <linux/sizes.h>
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#include "binder_alloc.h"
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#include "binder_trace.h"
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@ -689,7 +690,9 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
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alloc->buffer = (void __user *)vma->vm_start;
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mutex_unlock(&binder_alloc_mmap_lock);
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alloc->pages = kcalloc((vma->vm_end - vma->vm_start) / PAGE_SIZE,
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alloc->buffer_size = min_t(unsigned long, vma->vm_end - vma->vm_start,
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SZ_4M);
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alloc->pages = kcalloc(alloc->buffer_size / PAGE_SIZE,
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sizeof(alloc->pages[0]),
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GFP_KERNEL);
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if (alloc->pages == NULL) {
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@ -697,7 +700,6 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
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failure_string = "alloc page array";
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goto err_alloc_pages_failed;
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}
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alloc->buffer_size = vma->vm_end - vma->vm_start;
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (!buffer) {
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