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x86/mm: Cleanup the control_va_addr_alignment() __setup handler
[ Upstream commit1ef64b1e89
] Clean up control_va_addr_alignment(): a. Make '=' required instead of optional (as documented). b. Print a warning if an invalid option value is used. c. Return 1 from the __setup handler when an invalid option value is used. This prevents the kernel from polluting init's (limited) environment space with the entire string. Fixes:dfb09f9b7a
("x86, amd: Avoid cache aliasing penalties on AMD family 15h") Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru> Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru Link: https://lore.kernel.org/r/20220315001045.7680-1-rdunlap@infradead.org Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 2 additions and 5 deletions
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@ -68,9 +68,6 @@ static int __init control_va_addr_alignment(char *str)
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if (*str == 0)
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return 1;
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if (*str == '=')
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str++;
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if (!strcmp(str, "32"))
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va_align.flags = ALIGN_VA_32;
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else if (!strcmp(str, "64"))
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@ -80,11 +77,11 @@ static int __init control_va_addr_alignment(char *str)
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else if (!strcmp(str, "on"))
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va_align.flags = ALIGN_VA_32 | ALIGN_VA_64;
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else
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return 0;
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pr_warn("invalid option value: 'align_va_addr=%s'\n", str);
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return 1;
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}
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__setup("align_va_addr", control_va_addr_alignment);
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__setup("align_va_addr=", control_va_addr_alignment);
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SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags,
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