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Code Issues Releases Activity

Move setugidsafety() call outside of process lock. This prevents a lock

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recursion when closef() calls pfind() which also wants the proc lock.
This case only occurred when setugidsafety() needed to close unsafe files.

Reviewed by:	truckman
This commit is contained in:
Nate Lawson 2002-09-14 18:55:11 +00:00
parent e47c217844
commit c1e2d3866f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103326
1 changed files with 5 additions and 3 deletions
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8
sys/kern/kern_exec.c
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@ -435,15 +435,17 @@ execve(td, uap)
mtx_unlock(&ktrace_mtx); mtx_unlock(&ktrace_mtx);
} }
#endif #endif
/* Close any file descriptors 0..2 that reference procfs */
setugidsafety(td);
/* /*
* Make sure file descriptors 0..2 are in use. * Close any file descriptors 0..2 that reference procfs,
* then make sure file descriptors 0..2 are in use.
* *
* setugidsafety() may call closef() and then pfind()
* which may grab the process lock.
* fdcheckstd() may call falloc() which may block to * fdcheckstd() may call falloc() which may block to
* allocate memory, so temporarily drop the process lock. * allocate memory, so temporarily drop the process lock.
*/ */
PROC_UNLOCK(p); PROC_UNLOCK(p);
setugidsafety(td);
error = fdcheckstd(td); error = fdcheckstd(td);
PROC_LOCK(p); PROC_LOCK(p);
if (error != 0) if (error != 0)