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fallback to /etc/shadow should happen only when the entry is not found
in the TCB shadow. otherwise transient errors or permission errors can
cause inconsistent results.
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this case is specified as success with a null result, rather than an
error, and errno is not to be set on success.
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commit 2d7d05f031e014068a61d3076c6178513395d2ae wrongly changed ERANGE
to EINVAL, likely as the result of copy-and-paste error.
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these functions return an error code, and are not explicitly
documented to set errno, but they are nonstandard and the historical
implementations do set errno as well, and some applications expect
this behavior. do likewise for compatibility.
patch by Rudolph Pereira.
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when using /etc/shadow (rather than tcb) as its backend, getspnam_r
matched any username starting with the caller-provided string rather
than requiring an exact match. in practice this seems to have affected
only systems where one valid username is a prefix for another valid
username, and where the longer username appears first in the shadow
file.
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