buffer: fix range checks for slice() #9174
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mscdex
reviewed
Oct 19, 2016
| const start = { | ||
| [Symbol.toPrimitive]() { | ||
| // We use this condition to get around the check in lib/buffer.js | ||
| if (ctr <= 0) { |
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Minor nit: this can be just ctr === 0.
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no. in case the internals change then cntr may be less than 0. if that's the case then the value needs to be updated. which is why i have the followup check below of
assert.ok(elseWasLast,
'internal API changed, -1 no longer in correct location');
fhinkel
approved these changes
Oct 19, 2016
bnoordhuis
approved these changes
Oct 19, 2016
|
Here is another test that this fixes that would otherwise have triggered the const buf = new Buffer('w00t');
Object.defineProperty(buf, 'length', {
value: 1337,
enumerable: true
});
buf.fill(''); |
|
+1 to adding more tests! |
|
I'd like to get this landed today to be included in the v7.0.0 RC1. Can we add the additional tests in a separate PR? |
Using the black magic of Symbol.toPrimitive the numeric value of start/end can be changed when Uint32Value() is called once Buffer::Fill() is entered. Allowing the CHECK() to be bypassed. The bug report was only for "start", but the same can be done with "end". Perform checks for both in node::Buffer::Fill() to make sure the issue can't be triggered, even if process.binding is used directly. Include tests for each case. Along with a check to make sure the last time the value is accessed returns -1. This should be enough to make sure Buffer::Fill() is receiving the correct value. Along with two tests against process.binding directly. Fixes: nodejs#9149 PR-URL: nodejs#9174 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Franziska Hinkelmann <ranziska.hinkelmann@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
jasnell
pushed a commit
that referenced
this pull request
Oct 20, 2016
Using the black magic of Symbol.toPrimitive the numeric value of start/end can be changed when Uint32Value() is called once Buffer::Fill() is entered. Allowing the CHECK() to be bypassed. The bug report was only for "start", but the same can be done with "end". Perform checks for both in node::Buffer::Fill() to make sure the issue can't be triggered, even if process.binding is used directly. Include tests for each case. Along with a check to make sure the last time the value is accessed returns -1. This should be enough to make sure Buffer::Fill() is receiving the correct value. Along with two tests against process.binding directly. Fixes: #9149 PR-URL: #9174 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Franziska Hinkelmann <ranziska.hinkelmann@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
MylesBorins
pushed a commit
that referenced
this pull request
Dec 20, 2016
Using the black magic of Symbol.toPrimitive the numeric value of start/end can be changed when Uint32Value() is called once Buffer::Fill() is entered. Allowing the CHECK() to be bypassed. The bug report was only for "start", but the same can be done with "end". Perform checks for both in node::Buffer::Fill() to make sure the issue can't be triggered, even if process.binding is used directly. Include tests for each case. Along with a check to make sure the last time the value is accessed returns -1. This should be enough to make sure Buffer::Fill() is receiving the correct value. Along with two tests against process.binding directly. Fixes: #9149 PR-URL: #9174 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Franziska Hinkelmann <ranziska.hinkelmann@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
|
@trevnorris I've gone ahead and landed this on v6.x. If you would like to see it on v4.x please submit a manual backport. Otherwise could you change the label to |
MylesBorins
pushed a commit
that referenced
this pull request
Dec 21, 2016
Using the black magic of Symbol.toPrimitive the numeric value of start/end can be changed when Uint32Value() is called once Buffer::Fill() is entered. Allowing the CHECK() to be bypassed. The bug report was only for "start", but the same can be done with "end". Perform checks for both in node::Buffer::Fill() to make sure the issue can't be triggered, even if process.binding is used directly. Include tests for each case. Along with a check to make sure the last time the value is accessed returns -1. This should be enough to make sure Buffer::Fill() is receiving the correct value. Along with two tests against process.binding directly. Fixes: #9149 PR-URL: #9174 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Franziska Hinkelmann <ranziska.hinkelmann@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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Checklist
make -j8 test(UNIX), orvcbuild test nosign(Windows) passesAffected core subsystem(s)
buffer
Description of change
Using the black magic of
Symbol.toPrimitivethe numeric value ofstart/end can be changed when
Uint32Value()is called onceBuffer::Fill()is entered. Allowing theCHECK()to be bypassed.The bug report was only for "start", but the same can be done with
"end". Perform checks for both in
node::Buffer::Fill()to make sure theissue can't be triggered, even if process.binding is used directly.
Include tests for each case. Along with a check to make sure the last
time the value is accessed returns
-1. This should be enough to makesure
Buffer::Fill()is receiving the correct value. Along with two testsagainst
process.bindingdirectly.Fixes: #9149
R=@nodejs/buffer