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85751e9e5b
Prior to the introduction of Unified vDSO support and compat layer for vDSO on arm64, AT_SYSINFO_EHDR was not defined for compat tasks. In the current implementation, AT_SYSINFO_EHDR is defined even if the compat vdso layer is not built, which has been shown to break Android applications using bionic: | 01-01 01:22:14.097 755 755 F libc : Fatal signal 11 (SIGSEGV), | code 1 (SEGV_MAPERR), fault addr 0x3cf2c96c in tid 755 (cameraserver), | pid 755 (cameraserver) | 01-01 01:22:14.112 759 759 F libc : Fatal signal 11 (SIGSEGV), | code 1 (SEGV_MAPERR), fault addr 0x3cf2c96c in tid 759 | (android.hardwar), pid 759 (android.hardwar) | 01-01 01:22:14.120 756 756 F libc : Fatal signal 11 (SIGSEGV) | code 1 (SEGV_MAPERR), fault addr 0x3cf2c96c in tid 756 (drmserver), | pid 756 (drmserver) Restore the old behaviour by making sure that AT_SYSINFO_EHDR for compat tasks is defined only when CONFIG_COMPAT_VDSO is enabled. Reported-by: John Stultz <john.stultz@linaro.org> Tested-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Will Deacon <will@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.