Helge Deller 6b5aef7cac linux-user: Fix AT_EXECFN in AUXV for symlinked programs ...

The AT_EXECFN entry in AUXV needs to keep the value which was used when
the program was started. Especially for symlinked programs qemu should
not try to resolve the realpath.

Here is a reproducer:
(arm64-chroot)root@p100:/# cd /usr/bin
(arm64-chroot)root@p100:/usr/bin# ln -s echo testprog
(arm64-chroot)root@p100:/usr/bin# LD_SHOW_AUXV=1 ./testprog | grep AT_EXECFN
AT_EXECFN:            ./testprog

In this example, "./testprog" is the correct output, and not "/usr/bin/echo".

This patch fixes parts of commit 258bec39 ("linux-user: Fix access to
/proc/self/exe").

Fixes: 258bec39 ("linux-user: Fix access to /proc/self/exe")
Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3379
Signed-off-by: Helge Deller <deller@gmx.de>

2026-05-19 15:37:33 +02:00

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