diff options
| author | Alexey Dobriyan <adobriyan@gmail.com> | 2020-03-05 21:17:19 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-02-05 10:37:39 +0100 |
| commit | 4f63b320afdd9af406f4426b0ff1a2cdb23e5b8d (patch) | |
| tree | 3099f93aeeedab9c2de5eabcf6413e13774e18fa | |
| parent | f22fecaf39c30acce701ffc3e9875020ba31f1f5 (diff) | |
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 <adobriyan@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200305181719.GA5490@avx2
| -rw-r--r-- | arch/x86/include/asm/page_64_types.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h index 645bd1d0ee07..64297eabad63 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 |