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exec: only build read_code when needed

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Only build read_code when binary formats that use it are built into the
kernel.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200515143646.3857579-26-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-06-07 21:42:40 -07:00 committed by Linus Torvalds
parent a1e81f9654
commit 48304f7994
1 changed files with 3 additions and 0 deletions
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fs/exec.c
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@ -1053,6 +1053,8 @@ int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size,
}
EXPORT_SYMBOL_GPL(kernel_read_file_from_fd);
#if defined(CONFIG_HAVE_AOUT) || defined(CONFIG_BINFMT_FLAT) || \
defined(CONFIG_BINFMT_ELF_FDPIC)
ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
{
ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);
@ -1061,6 +1063,7 @@ ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
return res;
}
EXPORT_SYMBOL(read_code);
#endif
/*
* Maps the mm_struct mm into the current task struct.