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authorEric W. Biederman <ebiederm@xmission.com>2017-05-22 15:40:12 -0500
committerEric W. Biederman <ebiederm@xmission.com>2017-05-23 07:40:44 -0500
commitc70d9d809fdeecedb96972457ee45c49a232d97f (patch)
treed814992a6f46fdc1b9faac491aaa30744cb2ed57 /mm/page-writeback.c
parent3fd37226216620c1a468afa999739d5016fbc349 (diff)
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ptrace: Properly initialize ptracer_cred on fork
When I introduced ptracer_cred I failed to consider the weirdness of fork where the task_struct copies the old value by default. This winds up leaving ptracer_cred set even when a process forks and the child process does not wind up being ptraced. Because ptracer_cred is not set on non-ptraced processes whose parents were ptraced this has broken the ability of the enlightenment window manager to start setuid children. Fix this by properly initializing ptracer_cred in ptrace_init_task This must be done with a little bit of care to preserve the current value of ptracer_cred when ptrace carries through fork. Re-reading the ptracer_cred from the ptracing process at this point is inconsistent with how PT_PTRACE_CAP has been maintained all of these years. Tested-by: Takashi Iwai <tiwai@suse.de> Fixes: 64b875f7ac8a ("ptrace: Capture the ptracer's creds not PT_PTRACE_CAP") Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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