procfs: fix some wrong error code usage
[root@wei 1]# cat /proc/1/mem cat: /proc/1/mem: No such process error code -ESRCH is wrong in this situation. Return -EPERM instead. Signed-off-by: Jovi Zhang <bookjovi@gmail.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -775,7 +775,8 @@ static ssize_t mem_read(struct file * file, char __user * buf,
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if (!task)
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goto out_no_task;
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if (check_mem_permission(task))
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ret = check_mem_permission(task);
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if (ret)
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goto out;
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ret = -ENOMEM;
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@ -845,7 +846,8 @@ static ssize_t mem_write(struct file * file, const char __user *buf,
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if (!task)
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goto out_no_task;
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if (check_mem_permission(task))
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copied = check_mem_permission(task);
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if (copied)
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goto out;
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copied = -ENOMEM;
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@ -917,6 +919,7 @@ static ssize_t environ_read(struct file *file, char __user *buf,
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if (!task)
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goto out_no_task;
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ret = -EPERM;
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if (!ptrace_may_access(task, PTRACE_MODE_READ))
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goto out;
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