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binfmt_elf: consume a stashed PT_INTERP substitute

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When a binfmt_misc loader entry stashed bprm->loader use it instead of
opening the path named in PT_INTERP. The substitution deliberately
changes as little as possible. Ownership transfers into the local
interpreter reference which the existing success and error paths already
release.

A binary without PT_INTERP has nothing to substitute for. Drop the
override at the end of the segment scan and load the binary natively.

Nothing sets bprm->loader yet.

Link: https://patch.msgid.link/20260721-work-bpf-binfmt_misc-ptinterp-v2-16-e57866e4ae0f@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-07-21 16:13:58 +02:00
parent 73808bc5fd
commit 2a4d517681
1 changed files with 4 additions and 1 deletions
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5
fs/binfmt_elf.c
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@@ -901,7 +901,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
goto out_free_interp;
interpreter = open_exec(elf_interpreter);
interpreter = bprm_open_interpreter(bprm, elf_interpreter);
kfree(elf_interpreter);
retval = PTR_ERR(interpreter);
if (IS_ERR(interpreter))
@@ -932,6 +932,9 @@ static int load_elf_binary(struct linux_binprm *bprm)
goto out_free_ph;
}
/* No PT_INTERP to substitute for: the override does not apply. */
bprm_drop_loader(bprm);
elf_ppnt = elf_phdata;
for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++)
switch (elf_ppnt->p_type) {