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setuid.2: Error checking should always be performed, even when caller is UID 0
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -72,6 +72,13 @@ On success, zero is returned.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.IR Note :
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there are cases where
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.BR setuid ()
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can fail even when the caller is UID 0;
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it is a grave security error to omit checking for a faulure return from
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.BR setuid ().
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.SH ERRORS
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.TP
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.B EAGAIN
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