linux-toradex.git/include/linux/elfcore.h, branch v6.6-rc5

elfcore: Add a cprm parameter to elf_core_extra_{phdrs,data_size}

2023-01-05T15:12:12+00:00

A subsequent fix for arm64 will use this parameter to parse the vma
information from the snapshot created by dump_vma_snapshot() rather than
traversing the vma list without the mmap_lock.

Fixes: 6dd8b1a0b6cb ("arm64: mte: Dump the MTE tags in the core file")
Cc:  # 5.18.x
Signed-off-by: Catalin Marinas 
Reported-by: Seth Jenkins 
Suggested-by: Seth Jenkins 
Cc: Will Deacon 
Cc: Eric Biederman 
Cc: Kees Cook 
Link: https://lore.kernel.org/r/20221222181251.1345752-3-catalin.marinas@arm.com
Signed-off-by: Will Deacon

[elf][non-regset] uninline elf_core_copy_task_fpregs() (and lose pt_regs argument)

2022-11-25T04:24:23+00:00

Don't bother with pointless macros - we are not sharing it with aout coredumps
anymore.  Just convert the underlying functions to the same arguments (nobody
uses regs, actually) and call them elf_core_copy_task_fpregs().  And unexport
the entire bunch, while we are at it.

[added missing includes in arch/{csky,m68k,um}/kernel/process.c to avoid extra
warnings about the lack of externs getting added to huge piles for those
files.  Pointless, but...]

Signed-off-by: Al Viro

elf_core_copy_task_regs(): task_pt_regs is defined everywhere

2022-10-23T22:06:56+00:00

Had been since 2011 for all live architectures, ever since 2013
for all architectures, period.

Signed-off-by: Al Viro

ELF: Remove elf_core_copy_kernel_regs()

2022-04-14T12:08:26+00:00

x86-32 was the last architecture that implemented separate user and
kernel registers.

Signed-off-by: Brian Gerst 
Signed-off-by: Borislav Petkov 
Reviewed-by: Thomas Gleixner 
Acked-by: Andy Lutomirski 
Acked-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220325153953.162643-3-brgerst@gmail.com

elfcore: Replace CONFIG_{IA64, UML} checks with a new option

2022-02-15T22:53:28+00:00

As arm64 is about to introduce MTE-specific phdrs in the core dump, add
a common CONFIG_ARCH_BINFMT_ELF_EXTRA_PHDRS option currently selectable
by UML_X86 and IA64.

Signed-off-by: Catalin Marinas 
Cc: Eric Biederman 
Link: https://lore.kernel.org/r/20220131165456.2160675-2-catalin.marinas@arm.com
Signed-off-by: Will Deacon

fs/binfmt_elf: replace open-coded string copy with get_task_comm

2022-01-20T06:52:53+00:00

It is better to use get_task_comm() instead of the open coded string
copy as we do in other places.

struct elf_prpsinfo is used to dump the task information in userspace
coredump or kernel vmcore.  Below is the verification of vmcore,

  crash> ps
     PID    PPID  CPU       TASK        ST  %MEM     VSZ    RSS  COMM
        0      0   0  ffffffff9d21a940  RU   0.0       0      0  [swapper/0]
  >     0      0   1  ffffa09e40f85e80  RU   0.0       0      0  [swapper/1]
  >     0      0   2  ffffa09e40f81f80  RU   0.0       0      0  [swapper/2]
  >     0      0   3  ffffa09e40f83f00  RU   0.0       0      0  [swapper/3]
  >     0      0   4  ffffa09e40f80000  RU   0.0       0      0  [swapper/4]
  >     0      0   5  ffffa09e40f89f80  RU   0.0       0      0  [swapper/5]
        0      0   6  ffffa09e40f8bf00  RU   0.0       0      0  [swapper/6]
  >     0      0   7  ffffa09e40f88000  RU   0.0       0      0  [swapper/7]
  >     0      0   8  ffffa09e40f8de80  RU   0.0       0      0  [swapper/8]
  >     0      0   9  ffffa09e40f95e80  RU   0.0       0      0  [swapper/9]
  >     0      0  10  ffffa09e40f91f80  RU   0.0       0      0  [swapper/10]
  >     0      0  11  ffffa09e40f93f00  RU   0.0       0      0  [swapper/11]
  >     0      0  12  ffffa09e40f90000  RU   0.0       0      0  [swapper/12]
  >     0      0  13  ffffa09e40f9bf00  RU   0.0       0      0  [swapper/13]
  >     0      0  14  ffffa09e40f98000  RU   0.0       0      0  [swapper/14]
  >     0      0  15  ffffa09e40f9de80  RU   0.0       0      0  [swapper/15]

It works well as expected.

Some comments are added to explain why we use the hard-coded 16.

Link: https://lkml.kernel.org/r/20211120112738.45980-5-laoar.shao@gmail.com
Suggested-by: Kees Cook 
Signed-off-by: Yafang Shao 
Reviewed-by: David Hildenbrand 
Cc: Mathieu Desnoyers 
Cc: Arnaldo Carvalho de Melo 
Cc: Andrii Nakryiko 
Cc: Michal Miroslaw 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Cc: Matthew Wilcox 
Cc: David Hildenbrand 
Cc: Al Viro 
Cc: Kees Cook 
Cc: Petr Mladek 
Cc: Alexei Starovoitov 
Cc: Andrii Nakryiko 
Cc: Dennis Dalessandro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

elfcore: correct reference to CONFIG_UML

2021-10-19T06:22:03+00:00

Commit 6e7b64b9dd6d ("elfcore: fix building with clang") introduces
special handling for two architectures, ia64 and User Mode Linux.
However, the wrong name, i.e., CONFIG_UM, for the intended Kconfig
symbol for User-Mode Linux was used.

Although the directory for User Mode Linux is ./arch/um; the Kconfig
symbol for this architecture is called CONFIG_UML.

Luckily, ./scripts/checkkconfigsymbols.py warns on non-existing configs:

  UM
  Referencing files: include/linux/elfcore.h
  Similar symbols: UML, NUMA

Correct the name of the config to the intended one.

[akpm@linux-foundation.org: fix um/x86_64, per Catalin]
  Link: https://lkml.kernel.org/r/20211006181119.2851441-1-catalin.marinas@arm.com
  Link: https://lkml.kernel.org/r/YV6pejGzLy5ppEpt@arm.com

Link: https://lkml.kernel.org/r/20211006082209.417-1-lukas.bulwahn@gmail.com
Fixes: 6e7b64b9dd6d ("elfcore: fix building with clang")
Signed-off-by: Lukas Bulwahn 
Cc: Arnd Bergmann 
Cc: Nathan Chancellor 
Cc: Nick Desaulniers 
Cc: Catalin Marinas 
Cc: Barret Rhoden 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

elf_prstatus: collect the common part (everything before pr_reg) into a struct

2021-01-06T13:38:29+00:00

Preparations to doing i386 compat elf_prstatus sanely - rather than duplicating
the beginning of compat_elf_prstatus, take these fields into a separate
structure (compat_elf_prstatus_common), so that it could be reused.  Due to
the incestous relationship between binfmt_elf.c and compat_binfmt_elf.c we
need the same shape change done to native struct elf_prstatus, gathering the
fields prior to pr_reg into a new structure (struct elf_prstatus_common).

Fortunately, offset of pr_reg is always a multiple of 16 with no padding
right before it, so it's possible to turn all the stuff prior to it into
a single member without disturbing the layout.

[build fix from Geert Uytterhoeven folded in]

Signed-off-by: Al Viro

elfcore: fix building with clang

2020-12-11T22:02:14+00:00

kernel/elfcore.c only contains weak symbols, which triggers a bug with
clang in combination with recordmcount:

  Cannot find symbol for section 2: .text.
  kernel/elfcore.o: failed

Move the empty stubs into linux/elfcore.h as inline functions.  As only
two architectures use these, just use the architecture specific Kconfig
symbols to key off the declaration.

Link: https://lkml.kernel.org/r/20201204165742.3815221-2-arnd@kernel.org
Signed-off-by: Arnd Bergmann 
Cc: Nathan Chancellor 
Cc: Nick Desaulniers 
Cc: Barret Rhoden 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kill elf_fpxregs_t

2020-07-27T18:29:23+00:00

all uses are conditional upon ELF_CORE_COPY_XFPREGS, which has not
been defined on any architecture since 2010

Signed-off-by: Al Viro