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0902b3cb23
The "transitional" symbol keyword, while working with the "olddefconfig"
target, was prompting during "oldconfig". This occurred because these
symbols were not being marked as user-defined when they received values
from transitional symbols that had user values. The "olddefconfig" target
explicitly doesn't prompt for anything, so this deficiency wasn't noticed.
The issue manifested when a symbol's value came from a transitional
symbol's user value but the receiving symbol wasn't marked with
SYMBOL_DEF_USER. Thus the "oldconfig" logic would then prompt for these
symbols unnecessarily.
Check after value calculation whether a symbol without a user value
gets its value from a single transitional symbol that does have a user
value. In such cases, mark the receiving symbol as user-defined to
prevent prompting.
Update regression tests to verify that symbols with transitional defaults
are not prompted in "oldconfig", except when conditional defaults evaluate
to 'no' and should legitimately be prompted.
Build tested with "make testconfig".
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/lkml/CAHk-=wgZjUk4Cy2XgNkTrQoO8XCmNUHrTe5D519Fij1POK+3qw@mail.gmail.com/
Fixes: f9afce4f32 ("kconfig: Add transitional symbol attribute for migration support")
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Link: https://lore.kernel.org/r/20250930154514.it.623-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
21 lines
616 B
Plaintext
21 lines
616 B
Plaintext
CONFIG_MODULES=y
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CONFIG_OLD_BOOL=y
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CONFIG_OLD_TRISTATE=m
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CONFIG_OLD_STRING="test string"
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CONFIG_OLD_HEX=0x1234
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CONFIG_OLD_INT=42
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# CONFIG_NEW_BOOL_PRECEDENCE is not set
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CONFIG_OLD_BOOL_PRECEDENCE=y
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CONFIG_NEW_STRING_PRECEDENCE="user value"
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CONFIG_OLD_STRING_PRECEDENCE="old value"
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CONFIG_NEW_TRISTATE_PRECEDENCE=y
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CONFIG_OLD_TRISTATE_PRECEDENCE=m
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CONFIG_NEW_HEX_PRECEDENCE=0xABCD
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CONFIG_OLD_HEX_PRECEDENCE=0x5678
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CONFIG_NEW_INT_PRECEDENCE=100
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CONFIG_OLD_INT_PRECEDENCE=200
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# CONFIG_OLD_DISABLED is not set
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# CONFIG_OLD_DISABLED_UNSAVED is not set
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# CONFIG_DEPENDENCY_TEST is not set
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CONFIG_OLD_CONDITIONAL_DEFAULT=y
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