linux-stable.git/Makefile, branch v3.2.100 Linux kernel stable tree Linux 3.2.100 2018-03-03T15:57:56+00:00 Ben Hutchings ben@decadent.org.uk 2018-03-03T15:51:09+00:00 1c7cb8cda914e52512582111685782dec6bcc73a 






kbuild: add '-fno-stack-check' to kernel build options
2018-03-03T15:50:53+00:00

Linus Torvalds
torvalds@linux-foundation.org

2017-12-30T01:34:43+00:00

6b85c8c37160135bd9b3fb1dc652ddd230093c25

commit 3ce120b16cc548472f80cf8644f90eda958cf1b6 upstream.

It appears that hardened gentoo enables "-fstack-check" by default for
gcc.

That doesn't work _at_all_ for the kernel, because the kernel stack
doesn't act like a user stack at all: it's much smaller, and it doesn't
auto-expand on use.  So the extra "probe one page below the stack" code
generated by -fstack-check just breaks the kernel in horrible ways,
causing infinite double faults etc.

[ I have to say, that the particular code gcc generates looks very
  stupid even for user space where it works, but that's a separate
  issue.  ]

Reported-and-tested-by: Alexander Tsoy <alexander@tsoy.me>
Reported-and-tested-by: Toralf Förster <toralf.foerster@gmx.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>





commit 3ce120b16cc548472f80cf8644f90eda958cf1b6 upstream.

It appears that hardened gentoo enables "-fstack-check" by default for
gcc.

That doesn't work _at_all_ for the kernel, because the kernel stack
doesn't act like a user stack at all: it's much smaller, and it doesn't
auto-expand on use.  So the extra "probe one page below the stack" code
generated by -fstack-check just breaks the kernel in horrible ways,
causing infinite double faults etc.

[ I have to say, that the particular code gcc generates looks very
  stupid even for user space where it works, but that's a separate
  issue.  ]

Reported-and-tested-by: Alexander Tsoy <alexander@tsoy.me>
Reported-and-tested-by: Toralf Förster <toralf.foerster@gmx.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>







Linux 3.2.99
2018-02-13T18:32:25+00:00

Ben Hutchings
ben@decadent.org.uk

2018-02-13T18:32:25+00:00

9e487858958b03eb4d11ae0da64b85f6ba812338












Linux 3.2.98
2018-01-07T01:46:55+00:00

Ben Hutchings
ben@decadent.org.uk

2018-01-07T01:46:55+00:00

05580ec65bc245f55bb19ca11ccf8bd4aa1a8bc1












Linux 3.2.97
2018-01-01T20:51:06+00:00

Ben Hutchings
ben@decadent.org.uk

2018-01-01T20:51:06+00:00

3993a5061a845fe8d7a92b47e478265b0f5754d1












Linux 3.2.96
2017-11-26T13:51:12+00:00

Ben Hutchings
ben@decadent.org.uk

2017-11-26T13:51:12+00:00

07a40fa22291c6d10583ab00fc8589e3c2088372












Linux 3.2.95
2017-11-11T13:34:52+00:00

Ben Hutchings
ben@decadent.org.uk

2017-11-11T13:34:52+00:00

8518814021e098a07b305a3c98620fc414ac0f20












Linux 3.2.94
2017-10-12T14:27:23+00:00

Ben Hutchings
ben@decadent.org.uk

2017-10-12T14:27:23+00:00

fb71fde4183b062e2487b7f795d3d66554182046












Linux 3.2.93
2017-09-15T17:30:58+00:00

Ben Hutchings
ben@decadent.org.uk

2017-09-15T17:30:58+00:00

a4b54bb06240ced3240474c48d30398d15a654d2












Linux 3.2.92
2017-08-26T01:14:07+00:00

Ben Hutchings
ben@decadent.org.uk

2017-08-26T01:14:07+00:00

52bc1fde85f0baf84ef30ebe32560c16c924696e