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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>
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parent
2e80f13937
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1e25112dc0
@ -139,7 +139,6 @@ _start:\n\
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_dl_start_user:\n\
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adr r6, .L_GET_GOT\n\
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add sl, sl, r6\n\
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ldr r4, [sl, r4]\n\
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@ save the entry point in another register\n\
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mov r6, r0\n\
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@ get the original arg count\n\
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