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authorNicolas Iooss <nicolas.iooss_linux@m4x.org>2015-06-25 15:03:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 17:00:43 -0700
commit5202efe544c279be152f44f2821010ff7b2d7e5b (patch)
tree35d7726c6314074c18963cd08d7351ea50f1f0db /Documentation/sysctl/kernel.txt
parent89bfae43c8999344c3025802a3652ac42f55278e (diff)
coredump: use from_kuid/kgid when formatting corename
When adding __printf attribute to cn_printf, gcc reports some issues: fs/coredump.c:213:5: warning: format '%d' expects argument of type 'int', but argument 3 has type 'kuid_t' [-Wformat=] err = cn_printf(cn, "%d", cred->uid); ^ fs/coredump.c:217:5: warning: format '%d' expects argument of type 'int', but argument 3 has type 'kgid_t' [-Wformat=] err = cn_printf(cn, "%d", cred->gid); ^ These warnings come from the fact that the value of uid/gid needs to be extracted from the kuid_t/kgid_t structure before being used as an integer. More precisely, cred->uid and cred->gid need to be converted to either user-namespace uid/gid or to init_user_ns uid/gid. Use init_user_ns in order not to break existing ABI, and document this in Documentation/sysctl/kernel.txt. While at it, format uid and gid values with %u instead of %d because uid_t/__kernel_uid32_t and gid_t/__kernel_gid32_t are unsigned int. Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/sysctl/kernel.txt')
-rw-r--r--Documentation/sysctl/kernel.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index e5d528e0c46e..6fccb69c03e7 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -197,8 +197,8 @@ core_pattern is used to specify a core dumpfile pattern name.
%P global pid (init PID namespace)
%i tid
%I global tid (init PID namespace)
- %u uid
- %g gid
+ %u uid (in initial user namespace)
+ %g gid (in initial user namespace)
%d dump mode, matches PR_SET_DUMPABLE and
/proc/sys/fs/suid_dumpable
%s signal number