tools/nolibc: avoid error in dup2() if old fd equals new fd

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[ Upstream commit d1ff0e2d13 ]

dup2() allows both 'old' and 'new' to have the same value, which dup3()
does not. If libc dup2() is implemented through the dup3() system call,
then it would incorrectly fail in this case.

Avoid the error by handling old == new explicitly.

Fixes: 30ca20517a ("tools headers: Move the nolibc header from rcutorture to tools/include/nolibc/")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250820-nolibc-dup2-einval-v2-1-807185a45c56@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Thomas Weißschuh 2025-08-20 10:29:27 +02:00 • committed by Greg Kroah-Hartman

parent eec602bb0f

commit d69f5129f1

1 changed files with 13 additions and 0 deletions

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tools/include/nolibc/sys.h

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