namei: allow set_root() to produce errors

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For LOOKUP_BENEATH and LOOKUP_IN_ROOT it is necessary to ensure that
set_root() is never called, and thus (for hardening purposes) it should
return an error rather than permit a breakout from the root. In
addition, move all of the repetitive set_root() calls to nd_jump_root().

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Aleksa Sarai 2019-12-07 01:13:29 +11:00 • committed by Al Viro

parent 1bc82070fa

commit 740a167827

1 changed files with 24 additions and 11 deletions

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fs/namei.c

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