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a7ed7b9d0e
On arm64, it has been possible for a module's sections to be placed more
than 128M away from each other since commit:
commit 3e35d303ab7d ("arm64: module: rework module VA range selection")
Due to this, an ftrace callsite in a module's .init.text section can be
out of branch range for the module's ftrace PLT entry (in the module's
.text section). Any attempt to enable tracing of that callsite will
result in a BRK being patched into the callsite, resulting in a fatal
exception when the callsite is later executed.
Fix this by adding an additional trampoline for .init.text, which will
be within range.
No additional trampolines are necessary due to the way a given
module's executable sections are packed together. Any executable
section beginning with ".init" will be placed in MOD_INIT_TEXT,
and any other executable section, including those beginning with ".exit",
will be placed in MOD_TEXT.
Fixes: 3e35d303ab7d ("arm64: module: rework module VA range selection")
Cc: <stable@vger.kernel.org> # 6.5.x
Signed-off-by: panfan <panfan@qti.qualcomm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20250905032236.3220885-1-panfan@qti.qualcomm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
28 lines
841 B
C
28 lines
841 B
C
SECTIONS {
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.plt 0 : { BYTE(0) }
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.init.plt 0 : { BYTE(0) }
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.text.ftrace_trampoline 0 : { BYTE(0) }
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.init.text.ftrace_trampoline 0 : { BYTE(0) }
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#ifdef CONFIG_KASAN_SW_TAGS
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/*
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* Outlined checks go into comdat-deduplicated sections named .text.hot.
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* Because they are in comdats they are not combined by the linker and
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* we otherwise end up with multiple sections with the same .text.hot
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* name in the .ko file. The kernel module loader warns if it sees
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* multiple sections with the same name so we use this sections
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* directive to force them into a single section and silence the
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* warning.
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*/
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.text.hot : { *(.text.hot) }
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#endif
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#ifdef CONFIG_UNWIND_TABLES
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/*
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* Currently, we only use unwind info at module load time, so we can
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* put it into the .init allocation.
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*/
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.init.eh_frame : { *(.eh_frame) }
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#endif
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}
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