The following commit has been merged into the x86/cleanups branch of tip: Commit-ID: 4f63b320afdd9af406f4426b0ff1a2cdb23e5b8d Gitweb: https://git.kernel.org/tip/4f63b320afdd9af406f4426b0ff1a2cdb23e5b8d Author: Alexey Dobriyan <[email protected]> AuthorDate: Thu, 05 Mar 2020 21:17:19 +03:00 Committer: Borislav Petkov <[email protected]> CommitterDate: Fri, 05 Feb 2021 10:37:39 +01:00
x86/asm: Fixup TASK_SIZE_MAX comment Comment says "by preventing anything executable" which is not true. Even PROT_NONE mapping can't be installed at (1<<47 - 4096). mmap(0x7ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM [ bp: Fixup to the moved location in page_64_types.h. ] Signed-off-by: Alexey Dobriyan <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Reviewed-by: Andy Lutomirski <[email protected]> Link: https://lkml.kernel.org/r/20200305181719.GA5490@avx2 --- arch/x86/include/asm/page_64_types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h index 645bd1d..64297ea 100644 --- a/arch/x86/include/asm/page_64_types.h +++ b/arch/x86/include/asm/page_64_types.h @@ -66,7 +66,7 @@ * On Intel CPUs, if a SYSCALL instruction is at the highest canonical * address, then that syscall will enter the kernel with a * non-canonical return address, and SYSRET will explode dangerously. - * We avoid this particular problem by preventing anything executable + * We avoid this particular problem by preventing anything * from being mapped at the maximum canonical address. * * On AMD CPUs in the Ryzen family, there's a nasty bug in which the
