Mercurial > dropbear
view dbmalloc.h @ 1930:299f4f19ba19
Add /usr/sbin and /sbin to default root PATH
When dropbear is used in a very restricted environment (such as in a
initrd), the default user shell is often also very restricted
and doesn't take care of setting the PATH so the user ends up
with the PATH set by dropbear. Unfortunately, dropbear always
sets "/usr/bin:/bin" as default PATH even for the root user
which should have /usr/sbin and /sbin too.
For a concrete instance of this problem, see the "Remote Unlocking"
section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/
It speaks of a bug in the initramfs script because it's written "blkid"
instead of "/sbin/blkid"... this is just because the scripts from the
initramfs do not expect to have a PATH without the sbin directories and
because dropbear is not setting the PATH appropriately for the root user.
I'm thus suggesting to use the attached patch to fix this misbehaviour (I
did not test it, but it's easy enough). It might seem anecdotic but
multiple Kali users have been bitten by this.
From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author | Raphael Hertzog <hertzog@debian.org> |
---|---|
date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 8dc43b30c6bf |
children |
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#ifndef DBMALLOC_H_ #define DBMALLOC_H_ #include "options.h" #include <stdint.h> #include <stdlib.h> void * m_malloc(size_t size); void * m_calloc(size_t nmemb, size_t size); void * m_strdup(const char * str); void * m_realloc(void* ptr, size_t size); #if DROPBEAR_TRACKING_MALLOC void m_free_direct(void* ptr); void m_malloc_set_epoch(unsigned int epoch); void m_malloc_free_epoch(unsigned int epoch, int dofree); #else /* plain wrapper */ #define m_free_direct free #endif #define m_free(X) do {m_free_direct(X); (X) = NULL;} while (0) #endif /* DBMALLOC_H_ */