binfmt_flat: revert "binfmt_flat: don't offset the data start"
authorMax Filippov <jcmvbkbc@gmail.com>
Sat, 8 Aug 2020 18:37:13 +0000 (11:37 -0700)
committerGreg Ungerer <gerg@linux-m68k.org>
Sun, 23 Aug 2020 22:49:13 +0000 (08:49 +1000)
commit2217b982624680d19a80ebb4600d05c8586c4f96
tree2ce7590d312953c9e0190f5d38bd070f78f9ef3c
parentd012a7190fc1fd72ed48911e77ca97ba4521bccd
binfmt_flat: revert "binfmt_flat: don't offset the data start"

binfmt_flat loader uses the gap between text and data to store data
segment pointers for the libraries. Even in the absence of shared
libraries it stores at least one pointer to the executable's own data
segment. Text and data can go back to back in the flat binary image and
without offsetting data segment last few instructions in the text
segment may get corrupted by the data segment pointer.

Fix it by reverting commit a2357223c50a ("binfmt_flat: don't offset the
data start").

Cc: stable@vger.kernel.org
Fixes: a2357223c50a ("binfmt_flat: don't offset the data start")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
fs/binfmt_flat.c