Commit 79f0713d authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Linus Torvalds

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: default avatarMichael Kerrisk <>
Acked-by: default avatarKees Cook <>
Acked-by: default avatarMichael Kerrisk <>
Cc: Pavel Emelyanov <>
Cc: Tejun Heo <>
Cc: Oleg Nesterov <>
Cc: Paul Bolle <>
Cc: KOSAKI Motohiro <>
Signed-off-by: default avatarCyrill Gorcunov <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 9bbad7da
......@@ -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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