hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fix a leak in replace_fd() users 

replace_fd() began with "eats a reference, tries to insert into
descriptor table" semantics; at some point I'd switched it to
much saner current behaviour ("try to insert into descriptor
table, grabbing a new reference if inserted; caller should do
fput() in any case"), but forgot to update the callers.
Mea culpa...

[Spotted by Pavel Roskin, who has really weird system with pipe-fed
coredumps as part of what he considers a normal boot ;-)]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-16 13:30:07 -04:00
parent dd8e8c4a2c
commit 45525b26a4
2 changed files with 10 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/coredump.c
View File

@ -450,11 +450,12 @@ static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
cp->file = files[1]; cp->file = files[1];
replace_fd(0, files[0], 0); err = replace_fd(0, files[0], 0);
fput(files[0]);
/* and disallow core files too */ /* and disallow core files too */
current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1}; current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1};
return 0; return err;
} }
void do_coredump(siginfo_t *siginfo, struct pt_regs *regs) void do_coredump(siginfo_t *siginfo, struct pt_regs *regs)

18
security/selinux/hooks.c
View File

@ -2132,18 +2132,14 @@ static inline void flush_unauthorized_files(const struct cred *cred,
return; return;
devnull = dentry_open(&selinux_null, O_RDWR, cred); devnull = dentry_open(&selinux_null, O_RDWR, cred);
if (!IS_ERR(devnull)) { if (IS_ERR(devnull))
/* replace all the matching ones with this */ devnull = NULL;
do { /* replace all the matching ones with this */
replace_fd(n - 1, get_file(devnull), 0); do {
} while ((n = iterate_fd(files, n, match_file, cred)) != 0); replace_fd(n - 1, devnull, 0);
} while ((n = iterate_fd(files, n, match_file, cred)) != 0);
if (devnull)
fput(devnull); fput(devnull);
} else {
/* just close all the matching ones */
do {
replace_fd(n - 1, NULL, 0);
} while ((n = iterate_fd(files, n, match_file, cred)) != 0);
}
} }
/* /*