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binfmt_elf: switch elf_map() to vm_mmap/vm_munmap

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No reason to hold ->mmap_sem over the sequence

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-05-30 01:49:38 -04:00
parent 63d37a84ab
commit 5a5e4c2eca
1 changed files with 3 additions and 5 deletions
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8
fs/binfmt_elf.c
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@ -329,7 +329,6 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
if (!size)
return addr;
down_write(&current->mm->mmap_sem);
/*
* total_size is the size of the ELF (interpreter) image.
* The _first_ mmap needs to know the full size, otherwise
@ -340,13 +339,12 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
*/
if (total_size) {
total_size = ELF_PAGEALIGN(total_size);
map_addr = do_mmap(filep, addr, total_size, prot, type, off);
map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
if (!BAD_ADDR(map_addr))
do_munmap(current->mm, map_addr+size, total_size-size);
vm_munmap(map_addr+size, total_size-size);
} else
map_addr = do_mmap(filep, addr, size, prot, type, off);
map_addr = vm_mmap(filep, addr, size, prot, type, off);
up_write(&current->mm->mmap_sem);
return(map_addr);
}