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453431a549
As said by Linus: A symmetric naming is only helpful if it implies symmetries in use. Otherwise it's actively misleading. In "kzalloc()", the z is meaningful and an important part of what the caller wants. In "kzfree()", the z is actively detrimental, because maybe in the future we really _might_ want to use that "memfill(0xdeadbeef)" or something. The "zero" part of the interface isn't even _relevant_. The main reason that kzfree() exists is to clear sensitive information that should not be leaked to other future users of the same memory objects. Rename kzfree() to kfree_sensitive() to follow the example of the recently added kvfree_sensitive() and make the intention of the API more explicit. In addition, memzero_explicit() is used to clear the memory to make sure that it won't get optimized away by the compiler. The renaming is done by using the command sequence: git grep -w --name-only kzfree |\ xargs sed -i 's/kzfree/kfree_sensitive/' followed by some editing of the kfree_sensitive() kerneldoc and adding a kzfree backward compatibility macro in slab.h. [akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h] [akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more] Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Joe Perches <joe@perches.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: "Jason A . Donenfeld" <Jason@zx2c4.com> Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
143 lines
2.5 KiB
Text
143 lines
2.5 KiB
Text
// SPDX-License-Identifier: GPL-2.0-only
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/// Find uses of standard freeing functons on values allocated using devm_
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/// functions. Values allocated using the devm_functions are freed when
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/// the device is detached, and thus the use of the standard freeing
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/// function would cause a double free.
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/// See Documentation/driver-api/driver-model/devres.rst for more information.
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///
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/// A difficulty of detecting this problem is that the standard freeing
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/// function might be called from a different function than the one
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/// containing the allocation function. It is thus necessary to make the
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/// connection between the allocation function and the freeing function.
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/// Here this is done using the specific argument text, which is prone to
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/// false positives. There is no rule for the request_region and
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/// request_mem_region variants because this heuristic seems to be a bit
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/// less reliable in these cases.
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///
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// Confidence: Moderate
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// Copyright: (C) 2011 Julia Lawall, INRIA/LIP6.
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// Copyright: (C) 2011 Gilles Muller, INRIA/LiP6.
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// URL: http://coccinelle.lip6.fr/
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// Comments:
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// Options: --no-includes --include-headers
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virtual org
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virtual report
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virtual context
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@r depends on context || org || report@
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expression x;
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@@
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(
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x = devm_kmalloc(...)
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x = devm_kvasprintf(...)
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x = devm_kasprintf(...)
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x = devm_kzalloc(...)
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x = devm_kmalloc_array(...)
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x = devm_kcalloc(...)
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x = devm_kstrdup(...)
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x = devm_kmemdup(...)
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x = devm_get_free_pages(...)
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x = devm_request_irq(...)
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x = devm_ioremap(...)
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x = devm_ioport_map(...)
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)
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@safe depends on context || org || report exists@
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expression x;
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position p;
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@@
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(
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x = kmalloc(...)
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x = kvasprintf(...)
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x = kasprintf(...)
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x = kzalloc(...)
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x = kmalloc_array(...)
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x = kcalloc(...)
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x = kstrdup(...)
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x = kmemdup(...)
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x = get_free_pages(...)
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x = request_irq(...)
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x = ioremap(...)
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x = ioport_map(...)
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)
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...
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(
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kfree@p(x)
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kfree_sensitive@p(x)
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krealloc@p(x, ...)
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free_pages@p(x, ...)
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free_page@p(x)
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free_irq@p(x)
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iounmap@p(x)
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ioport_unmap@p(x)
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)
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@pb@
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expression r.x;
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position p != safe.p;
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@@
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(
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* kfree@p(x)
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* kfree_sensitive@p(x)
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* krealloc@p(x, ...)
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* free_pages@p(x, ...)
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* free_page@p(x)
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* free_irq@p(x)
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* iounmap@p(x)
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* ioport_unmap@p(x)
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)
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@script:python depends on org@
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p << pb.p;
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@@
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msg="WARNING: invalid free of devm_ allocated data"
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coccilib.org.print_todo(p[0], msg)
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@script:python depends on report@
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p << pb.p;
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@@
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msg="WARNING: invalid free of devm_ allocated data"
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coccilib.report.print_report(p[0], msg)
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