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Adhemerval Zanella 1e25112dc0 arm: Remove wrong ldr from _dl_start_user (BZ 31339) 
The commit 49d877a80b (arm: Remove
_dl_skip_args usage) removed the _SKIP_ARGS literal, which was
previously loader to r4 on loader _start.  However, the cleanup did not
remove the following 'ldr r4, [sl, r4]' on _dl_start_user, used to check
to skip the arguments after ld self-relocations.

In my testing, the kernel initially set r4 to 0, which makes the
ldr instruction just read the _GLOBAL_OFFSET_TABLE_.  However, since r4
is a callee-saved register; a different runtime might not zero
initialize it and thus trigger an invalid memory access.

Checked on arm-linux-gnu.

Reported-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
2024-02-05 15:29:23 -03:00
..
armv6 Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
armv6t2 string: Use builtins for ffs and ffsll 2024-02-01 09:31:33 -03:00
armv7 Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
be
bits Refer to C23 in place of C2X in glibc 2024-02-01 11:02:01 +00:00
include/bits Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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sys Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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addmul_1.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
aeabi_assert.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
aeabi_atexit.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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aeabi_unwind_cpp_pr1.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
arm-features.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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bsd-_setjmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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configure
configure.ac
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dl-machine-rel.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-machine.h arm: Remove wrong ldr from _dl_start_user (BZ 31339) 2024-02-05 15:29:23 -03:00
dl-tls.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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framestate.c
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libc-aeabi_read_tp.S
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libm-test-ulps
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Makefile
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math-use-builtins-sqrt.h
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pointer_guard.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
preconfigure
preconfigure.ac
rt-aeabi_unwind_cpp_pr1.c
rt-arm-unwind-resume.S
rtld-global-offsets.sym
setfpucw.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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test-fpucw.c
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tlsdesc.sym
tst-armtlsdescextlazy.c
tst-armtlsdescextlazymod.c
tst-armtlsdescextnow.c
tst-armtlsdescextnowmod.c
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unwind-pe.c
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