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read_code(): go through vfs_read() instead of calling the method directly

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... and don't skip on sanity checks.  It's *not* a hot path, TYVM
(a couple of calls per a.out execve(), for pity sake) and headers of
random a.out binary are not to be trusted.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-02-04 19:08:21 -05:00
parent 0165e8100b
commit ec69557982
1 changed files with 1 additions and 1 deletions
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2
fs/exec.c
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@ -810,7 +810,7 @@ EXPORT_SYMBOL(kernel_read);
ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len) ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
{ {
ssize_t res = file->f_op->read(file, (void __user *)addr, len, &pos); ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);
if (res > 0) if (res > 0)
flush_icache_range(addr, addr + len); flush_icache_range(addr, addr + len);
return res; return res;