Socket dataset: Workaround for bogus dereference in kernel 5.x#15771
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adriansr merged 4 commits intoelastic:masterfrom Jan 23, 2020
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Socket dataset: Workaround for bogus dereference in kernel 5.x#15771adriansr merged 4 commits intoelastic:masterfrom
adriansr merged 4 commits intoelastic:masterfrom
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This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels. On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of kprobes defined by the dataset. This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail.
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andrewkroh
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Can you please add a changelog too.
| "github.com/elastic/beats/x-pack/auditbeat/tracing" | ||
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adriansr
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…ic#15771) This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels. On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of kprobes defined by the dataset. This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail. (cherry picked from commit 0dab517)
adriansr
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…ic#15771) This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels. On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of kprobes defined by the dataset. This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail. (cherry picked from commit 0dab517)
adriansr
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Jan 25, 2020
…ic#15771) This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels. On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of kprobes defined by the dataset. This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail. (cherry picked from commit 0dab517)
adriansr
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Jan 25, 2020
…erence in kernel 5.x (#15792) This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels. On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of kprobes defined by the dataset. This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail. (cherry picked from commit 0dab517)
adriansr
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… (#15791) This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels. On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of kprobes defined by the dataset. This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail. (cherry picked from commit 0dab517)
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This is a tentative workaround for the problems in Auditbeat's system/socket dataset when run under 5.x kernels.
On older kernels, we could rely on dereferencing a NULL or invalid pointer returning zeroed memory. However, seems that in the tested 5.x kernels is not the case. Dereferencing a NULL pointer returns bogus memory, which causes some wrong codepaths to be taken in a couple of
kprobes defined by the dataset.
This so far seems only to affect udp_sendmsg and udpv6_sendmsg, which caused it to attribute traffic to bogus IP addresses. In turn this caused the test-connected-udp system tests to fail.
In parallel I'm trying to find the reason for this different behavior and ideally have the tracing subsystem behave like in previous versions, so this patch is not needed.