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compiler-based memory initialization update
- Update stack auto-initialization selftest for Clang initialization pattern -----BEGIN PGP SIGNATURE----- Comment: Kees Cook <kees@outflux.net> iQJKBAABCgA0FiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAl0IYMcWHGtlZXNjb29r QGNocm9taXVtLm9yZwAKCRCJcvTf3G3AJsgVD/wO3F1KkJ4UtTd81RMlsouBgK/q XsYhuQ6YcOvsh41te8SUmY1YS7/SdtmfIjtTlS42pLVcNT+XROVNRSCCnuETd/lW Zp6SjfMU3Dd2zn6oVQRAYtO40YAGWqOvFwp4lHNXLo9zObqXOe/JrmPrLpnmEFeX 7ZQ0yFGWq4No5CKs6M8G/gNKI1z7DOlXtV/jT/otjekqukJnpwDdjBqhkPZpOMuC RyHgp9fFvnOBqMgPwUlzwDZLP3zCw/5N01myJZibTFCcFlZGD4IpuBJojrXwm3t4 +0Qx/Uz52pOTyUKkg26iIDJkX9LqBHxFeuPBVOxWXDW0xoMFqroDa/jWom5uFenK wYllZ0ixmlrHNqn1WlQsPjs5Awomh4btJ60D8JK7URhGWt34uzqH651aJaBoa9i3 jwCpiog4k/4r6nTKCQ5L1FiZoAAbmt2liv2MkQMYTdUoqlg7/gbgA3FPaIPN+969 WhBY6NqGrDVHyorQdAGw/Hmajj96A+d0pXtZUDZnYUke6IT1iuzr75adyZVNUNav 0/Rq2wDIa801tA2upe8GwCeYihhUyWnCPbPo+h4YaPQnb9UA9ScWbrR0rihHy1eu htmLdDR7/p0p8w1o17dOwm7V9pY/qtxwlKm+VxKNLSfvuMHhVJyLePE9hrgeXXxr 0Rt//ZrZfPnUIu5tkw== =bBoU -----END PGP SIGNATURE----- Merge tag 'meminit-v5.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull stack init fix from Kees Cook: "This is a small update to the stack auto-initialization self-test code to deal with the Clang initialization pattern. It's been in linux-next for a couple weeks; I had waited a bit wondering if anything more substantial was going to show up, but nothing has, so I'm sending this now before it gets too late" * tag 'meminit-v5.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: lib/test_stackinit: Handle Clang auto-initialization pattern
This commit is contained in:
commit
915ed9320c
@ -12,7 +12,7 @@
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/* Exfiltration buffer. */
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/* Exfiltration buffer. */
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#define MAX_VAR_SIZE 128
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#define MAX_VAR_SIZE 128
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static char check_buf[MAX_VAR_SIZE];
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static u8 check_buf[MAX_VAR_SIZE];
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/* Character array to trigger stack protector in all functions. */
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/* Character array to trigger stack protector in all functions. */
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#define VAR_BUFFER 32
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#define VAR_BUFFER 32
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@ -106,9 +106,18 @@ static noinline __init int test_ ## name (void) \
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\
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\
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/* Fill clone type with zero for per-field init. */ \
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/* Fill clone type with zero for per-field init. */ \
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memset(&zero, 0x00, sizeof(zero)); \
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memset(&zero, 0x00, sizeof(zero)); \
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/* Clear entire check buffer for 0xFF overlap test. */ \
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memset(check_buf, 0x00, sizeof(check_buf)); \
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/* Fill stack with 0xFF. */ \
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/* Fill stack with 0xFF. */ \
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ignored = leaf_ ##name((unsigned long)&ignored, 1, \
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ignored = leaf_ ##name((unsigned long)&ignored, 1, \
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FETCH_ARG_ ## which(zero)); \
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FETCH_ARG_ ## which(zero)); \
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/* Verify all bytes overwritten with 0xFF. */ \
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for (sum = 0, i = 0; i < target_size; i++) \
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sum += (check_buf[i] != 0xFF); \
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if (sum) { \
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pr_err(#name ": leaf fill was not 0xFF!?\n"); \
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return 1; \
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} \
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/* Clear entire check buffer for later bit tests. */ \
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/* Clear entire check buffer for later bit tests. */ \
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memset(check_buf, 0x00, sizeof(check_buf)); \
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memset(check_buf, 0x00, sizeof(check_buf)); \
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/* Extract stack-defined variable contents. */ \
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/* Extract stack-defined variable contents. */ \
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@ -126,9 +135,9 @@ static noinline __init int test_ ## name (void) \
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return 1; \
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return 1; \
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} \
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} \
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\
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\
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/* Look for any set bits in the check region. */ \
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/* Look for any bytes still 0xFF in check region. */ \
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for (i = 0; i < sizeof(check_buf); i++) \
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for (sum = 0, i = 0; i < target_size; i++) \
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sum += (check_buf[i] != 0); \
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sum += (check_buf[i] == 0xFF); \
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\
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\
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if (sum == 0) \
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if (sum == 0) \
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pr_info(#name " ok\n"); \
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pr_info(#name " ok\n"); \
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@ -162,13 +171,13 @@ static noinline __init int leaf_ ## name(unsigned long sp, \
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* Keep this buffer around to make sure we've got a \
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* Keep this buffer around to make sure we've got a \
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* stack frame of SOME kind... \
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* stack frame of SOME kind... \
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*/ \
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*/ \
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memset(buf, (char)(sp && 0xff), sizeof(buf)); \
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memset(buf, (char)(sp & 0xff), sizeof(buf)); \
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/* Fill variable with 0xFF. */ \
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/* Fill variable with 0xFF. */ \
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if (fill) { \
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if (fill) { \
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fill_start = &var; \
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fill_start = &var; \
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fill_size = sizeof(var); \
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fill_size = sizeof(var); \
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memset(fill_start, \
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memset(fill_start, \
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(char)((sp && 0xff) | forced_mask), \
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(char)((sp & 0xff) | forced_mask), \
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fill_size); \
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fill_size); \
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} \
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} \
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\
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\
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