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53fb6e990d
Randy reported that objtool got stuck in an infinite loop when
processing drivers/i2c/busses/i2c-parport.o. It was caused by the
following code:
00000000000001fd <line_set>:
1fd: 48 b8 00 00 00 00 00 movabs $0x0,%rax
204: 00 00 00
1ff: R_X86_64_64 .rodata-0x8
207: 41 55 push %r13
209: 41 89 f5 mov %esi,%r13d
20c: 41 54 push %r12
20e: 49 89 fc mov %rdi,%r12
211: 55 push %rbp
212: 48 89 d5 mov %rdx,%rbp
215: 53 push %rbx
216: 0f b6 5a 01 movzbl 0x1(%rdx),%ebx
21a: 48 8d 34 dd 00 00 00 lea 0x0(,%rbx,8),%rsi
221: 00
21e: R_X86_64_32S .rodata
222: 48 89 f1 mov %rsi,%rcx
225: 48 29 c1 sub %rax,%rcx
find_jump_table() saw the .rodata reference and tried to find a jump
table associated with it (though there wasn't one). The -0x8 rela
addend is unusual. It caused find_jump_table() to send a negative
table_offset (unsigned 0xfffffffffffffff8) to find_rela_by_dest().
The negative offset should have been harmless, but it actually threw
for_offset_range() for a loop... literally. When the mask value got
incremented past the end value, it also wrapped to zero, causing the
loop exit condition to remain true forever.
Prevent this scenario from happening by ensuring the incremented value
is always >= the starting value.
Fixes:
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History
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.