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qcom_scm_call_atomic1() can crash with a NULL pointer dereference at qcom_scm_call_atomic1+0x30/0x48. disassembly of qcom_scm_call_atomic1(): ... <0xc08d73b0 <+12>: ldr r3, [r12] ... (no instruction explicitly modifies r12) 0xc08d73cc <+40>: smc 0 ... (no instruction explicitly modifies r12) 0xc08d73d4 <+48>: ldr r3, [r12] <- crashing instruction ... Since the first ldr is successful, and since r12 isn't explicitly modified by any instruction between the first and the second ldr, it must have been modified by the smc call, which is ok, since r12 is caller save according to the AAPCS. Add r12 to the clobber list so that the compiler knows that the callee potentially overwrites the value in r12. Clobber descriptions may not in any way overlap with an input or output operand. Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Andy Gross <andy.gross@linaro.org> |
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| README | ||
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.