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fs: binfmt_elf_efpic: don't use missing interpreter's properties

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[ Upstream commit 15fd1dc3dadb4268207fa6797e753541aca09a2a ]

Static FDPIC executable may get an executable stack even when it has
non-executable GNU_STACK segment. This happens when STACK segment has rw
permissions, but does not specify stack size. In that case FDPIC loader
uses permissions of the interpreter's stack, and for static executables
with no interpreter it results in choosing the arch-default permissions
for the stack.

Fix that by using the interpreter's properties only when the interpreter
is actually used.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Link: https://lore.kernel.org/r/20240118150637.660461-1-jcmvbkbc@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 8ca5b21fa9b2c13aad93a97992b92f9360988fe9)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Max Filippov 2024-01-18 07:06:37 -08:00 committed by Vegard Nossum
parent 4e2660eb12
commit eba1af4c43
1 changed files with 1 additions and 1 deletions
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2
fs/binfmt_elf_fdpic.c
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@ -324,7 +324,7 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm)
else
executable_stack = EXSTACK_DEFAULT;
if (stack_size == 0) {
if (stack_size == 0 && interp_params.flags & ELF_FDPIC_FLAG_PRESENT) {
stack_size = interp_params.stack_size;
if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
executable_stack = EXSTACK_ENABLE_X;