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exec: Simplify unshare_files

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Now that exec no longer needs to return the unshared files to their
previous value there is no reason to return displaced.

Instead when unshare_fd creates a copy of the file table, call
put_files_struct before returning from unshare_files.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
v1: https://lkml.kernel.org/r/20200817220425.9389-2-ebiederm@xmission.com
Link: https://lkml.kernel.org/r/20201120231441.29911-2-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2020-11-20 17:14:19 -06:00
parent b604350128
commit 1f702603e7
4 changed files with 9 additions and 15 deletions
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5
fs/coredump.c
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@@ -585,7 +585,6 @@ void do_coredump(const kernel_siginfo_t *siginfo)
int ispipe;
size_t *argv = NULL;
int argc = 0;
struct files_struct *displaced;
/* require nonrelative corefile path and be extra careful */
bool need_suid_safe = false;
bool core_dumped = false;
@@ -791,11 +790,9 @@ void do_coredump(const kernel_siginfo_t *siginfo)
}
/* get us an unshared descriptor table; almost always a no-op */
retval = unshare_files(&displaced);
retval = unshare_files();
if (retval)
goto close_fail;
if (displaced)
put_files_struct(displaced);
if (!dump_interrupted()) {
/*
* umh disabled with CONFIG_STATIC_USERMODEHELPER_PATH="" would