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prctl: use CAP_SYS_RESOURCE for PR_SET_MM option

CAP_SYS_ADMIN is already overloaded left and right, so to have more
fine-grained access control use CAP_SYS_RESOURCE here.

The CAP_SYS_RESOUCE is chosen because this prctl option allows a current
process to adjust some fields of memory map descriptor which rather
represents what the process owns: pointers to code, data, stack
segments, command line, auxiliary vector data and etc.

Suggested-by: Michael Kerrisk <>
Acked-by: Kees Cook <>
Acked-by: Michael Kerrisk <>
Cc: Pavel Emelyanov <>
Cc: Tejun Heo <>
Cc: Oleg Nesterov <>
Cc: Paul Bolle <>
Cc: KOSAKI Motohiro <>
Signed-off-by: Cyrill Gorcunov <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
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cyrillos authored and torvalds committed Mar 15, 2012
1 parent 9bbad7d commit 79f0713d403c800db9d89134e2fd7f846e68d6ee
Showing with 1 addition and 1 deletion.
  1. +1 −1 kernel/sys.c
@@ -1706,7 +1706,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
if (arg4 | arg5)
return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
+ if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
if (addr >= TASK_SIZE)

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