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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2013-10-03 06:47:44 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2013-10-23 15:45:35 +0100
commit7b22c03536a539142f931815528d55df455ffe2d (patch)
tree1dcc6c025d94fb308cd77f9f74b75c0c10b2222c /Documentation
parentd0e639c9e06d44e713170031fe05fb60ebe680af (diff)
downloadlinux-7b22c03536a539142f931815528d55df455ffe2d.tar.bz2
arm64: check for number of arguments in syscall_get/set_arguments()
In ftrace_syscall_enter(), syscall_get_arguments(..., 0, n, ...) if (i == 0) { <handle orig_x0> ...; n--;} memcpy(..., n * sizeof(args[0])); If 'number of arguments(n)' is zero and 'argument index(i)' is also zero in syscall_get_arguments(), none of arguments should be copied by memcpy(). Otherwise 'n--' can be a big positive number and unexpected amount of data will be copied. Tracing system calls which take no argument, say sync(void), may hit this case and eventually make the system corrupted. This patch fixes the issue both in syscall_get_arguments() and syscall_set_arguments(). Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation')
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